1,848 research outputs found
Local Marchenko-Pastur Law for Sparse Rectangular Random Matrices
No full textGötze F, Timushev DA, Tikhomirov AN. Local Marchenko-Pastur Law for Sparse Rectangular Random Matrices. Doklady Mathematics. 2021;104(3):332-335.We consider sparse sample covariance matrices with sparsity probability with p(n) >= c(0) log((aleph) over bar) n/n with aleph > 0. Assuming that the distribution of matrix elements has a finite absolute moment of order 4 + delta, delta > 0, it is shown that the distance between the Stieltjes transforms of the empirical spectral distribution function and the Marchenko-Pastur law is of order n(1/(nv) + 1/(np(n))), where v is the distance to the real axis in the complex plane
Maritime activity in the high north – the range of unwanted incidents and risk patterns
No full textAuthor's accepted version (post-print).This is the accepted manuscript (post-print) of the article Marchenko, N., Borch, O. J., Markov, S. V. & Andreassen, N. (2015). Maritime activity in the high north – the range of unwanted incidents and risk patterns. Proceedings – International Conference on Port and Ocean Engineering under Arctic Conditions available at http://www.poac.com/PapersOnline.htm
Обмененный взгляд: к истории творческих отношений Вячеслава Иванова и Владимира Эрна
No full textTitolo in russo, tradotto: An Exchanged Glance: On the history of the Creative Relationship between V. Ivanov and V. ErnThe article of Oleg V. Marchenko is devoted to the history of creative relationships
between Vyacheslav Ivanov and his close friend, the Russian philosopher Vladimir
Ern (1882-1917). Particular attention is drawn to the idea of a metaphysical echo
expressed by Ern in a sophiological way in a number of his works of the early
1910s.This idea receives a specific response in V. Ivanov’s preface to the reissue of
the story of Lydia Zinovieva-Annibal "Thirty-three abominations
The Marchenko-Ostrovski mapping and the trace formula for the Camassa-Holm equation
No full textWe consider the periodic weighted operator Ty---- _p-2(p2y,), q_ p-4 in L2(l,p2dx) where p is a 1-periodic positive function satisfying q -- p/p C L2(0, 1). The spec- trum of T consists of intervals separated by gaps. In the first part of the paper we construct the Marchenko-Ostrovski mapping q --> h(q) and solve the corresponding inverse problem. For our approach it is essential that the mapping h has the factoriza- tion h(q) = h(V(q)), where q --> V(q) is a certain nonlinear mapping and V --> h(V) is the Marchenko-Ostrovski mapping for the Hill operator. In the second part of this paper we derive the trace formula for T in the case q C L2(0, 1)
Baikalozercon dracunculus Marchenko 2022, sp. nov.
No full textBaikalozercon dracunculus sp. nov. (Figures 1–40) Female (Figs 1–8, 11–19, n=10) Dorsal idiosoma (Figs 1, 5, 11). Idiosoma pear-shaped, 920–975 long, 650–700 wide, with tuberculate ornamentation, divided into two shields that cover the entire dorsal idiosoma. Anterior margin of podonotal shield curved ventrally to form a vertex. The most anterior setae j1 the longest (53–55) of all setae, pilose, inserted on anterior margin of idiosoma. Vertex with setae z1, the shortest (12–14), slightly barbed and pair of pore-like structures (glands) po1. All medial and lateral setae on dorsal shields slightly pilose (visible only with the use of oil immersion), located on rounded bases; marginal r-R setae slightly curved and feathered, inserted on rounded tubercles. Podonotal shield neotrichous, with 19–21 lateral setae of z, s -series (25–27µm), 31–36 medial setae of j -series (three pair of them longer 35–37 long, others as lateral), 18–19 setae of r -series (47–50) on each side. Podonotal shield ornamented with small tubercles forming a reticulated pattern with the exception of the midposterior region. Regions of podonotal shield between medial and lateral groups of setae with longitudinal fields of sigillae. Four pair of pore-like structures (glands) po1–po4 located in podonotum. Opisthonotal shield neotrichous, with tuberculate ornamentation except smooth reticulated regions between medial and lateral setae in anterior part and in mid-posterior region. Setae of J, Z and S -series in asymmetrical location. Medial 26–29 setae (25–27) located on raised area in the center of the shield, lateral 23–27 setae (as long as medial) located on raised ridges; and marginal 16–17 R -setae from each side (35–37); regions free of setae located in the depressions of the shield with about two pairs of sigillae. Area around five posterodorsal sigillae with smooth reticulation. Smooth reticulation radiates from the center like the petals of a flower. Four pairs of pores Po1–Po4 inserted in opisthonotum. Cribrum on the terminal end of the shield between the posteriormost marginal setae. Ventral idiosoma. (Figs 2–4, 6, 7, 12–14). Base of tritosternum 67–73 long and 40–45 wide; paired pilose laciniae free from each other along entire length, 105–112 long (Fig. 3). First sternal platelet single, hollow inside, with sharp ragged edges along inner contour; 45–50 long (along a vertical line through setae St1) and 75–80 wide, with pair of St1 setae (45–55) and slit-form lyrifissures iv1 (Fig. 2, 12). Second sternal platelet formed by two small separate oval platelets (30–45 x 15–25) located on a larger sclerotised cuticle (35–37 x 67–75), with pair of St2 setae (35–45) and oval lyrifissures iv2 adjacent to the anterio-lateral edge. Third sternal platelet entire, the largest, 120–125 long and 117–132 wide, with convoluted structure of cuticle above level of St4 setae; with a medial incision dividing the shield into two lobes in posterior part, not reaching level of St4 setae; with two pairs of setae St3 (40–45), St4 (45–50); with slit-form lyrifissures (iv3) and pair of large rounded poroids gv1 adjacent to the anterio-lateral edge (Figs 4, 13–14). Third sternal platelet surrounded by a hyaline membrane, inside which poroids gv1 located. Genital shield axe-shaped, expanded posteriorly, 160–175 long and 160–193 at widest part; with setae St5 (35–40), lyrifissures iv5 on shield or outside. Anterior part of the genital shield has a different cuticle structure than posterior one as shown in Fig. 4. The genital shield is surrounded by a trapeziform membrane with mid-anterior incision opposite the same on the third sternal platelet. In the typical position, anterior part of the genital shield extends under the third sternal platelet; under pressure on the slide, the shields are displaced vertically as shown in Fig. 4. One pair of post-genital sclerites inserted between genital and ventri-anal shields. Endopodal sclerites presented around of coxae III–IV. The anterior part of endopodal sclerite partially extends under the third sternal platelet. Exopodal sclerites fused with peritrematal shields in region of coxae III–IV. Peritrematal shields strongly sclerotised, ornamented with festoon reticulation along entire length; fused anteriorly forming vertex. Six pairs of poroids inserted in peritrematal shields: gp1–gp3 and ip1–ip3 and two pairs of short barbed setae: z1 and of the same length rx seta (12–14), located opposite III coxae. Peritremes slightly undulating, very long, extending from mid coxa IV to mid coxae I, 320–335 long. Metapodal platelets large, elongated in horizontal direction (17–25 x 75–95). Gland pores gv2 multiple, dispersed over surface: one pair of gland openings inserted in soft cuticle postero-laterad genital shield, other 5–7 located on ventri-anal shield from each side. Ventri-anal shield broad, 315–335 long and 550–615 wide, fused to opisthonotal shield posteriorly at level of para-anal setae, with festoon reticulation, with 11–15 opisthogastric smooth setae, setae Jv1–Jv3 the longest (30–37) and others shorter (25–30), marginal rows of opisthonotal setae pilose, slightly curved, on rounded tubercles from each side. Anterior most opisthogastric setae Jv1 can be located both on the shield or on the soft cuticle above it. Setae of Jv and Zv- rows are clearly distinguished (Jv1–Jv3, Zv1–Zv3), other setae in asymmetrical location. Anal area with smooth para-anal (25–27) and post-anal (31–37) setae; anal opening (45–50 x 40–42) with two pairs of lyrifissures on each valve; cribrum extends from ventral to dorsal sides of idiosoma between the posteriormost marginal setae. Pair of glands gv3 located anterolaterally of para-anal setae. Gnathosoma. (Figs 8, 15–19) Movable digit of chelicera 100–105 long, with three teeth in addition to apical hook; fixed digit the same length, with seven teeth in addition to apical hook and two-pointed pilus dentilis (Figs 15–16). Chelicera with long dorsal seta (40–43), lateral (antiaxial) and dorsal lyrifissures; with serrated arthrodial corona and suboval area (“window”) on paraxial side with thin cuticle. Epistome (Fig. 17) with irregularly serrated lateral edges and smooth, long, bifurcated median projection. Corniculi 55–57 long and 27–29 wide. Internal malae protrude distinctly beyond corniculi (Figs 18–19); with smooth elongated branches, barbed at base. Deutosternal groove with seven transverse denticulate rows. Subcapitulum with 2–3 paired festoon lateral transverse lines (Fig. 18). Setae h1–h3 smooth: h1 (67–69) the longest, seta h2 (37–39) shorter than h3 (55–57); pc (45–47) serrated. Dorsal side of gnathosoma with pair of paraxial lanceolate structures—“staples” between chelicera shaft and epistome in female as in male (Fig. 27) and immature stages. Palpal chaetotaxy 2–5–6–13–15, palp with five free segments; palp trochanter with seta al1 long and pilose in distal third, seta al2 short and smooth; palp genu with seta al1 smooth and al2 pilose in distal third; palp tarsal claw two-tined. Legs. (Figs 20–23, 28–29). Lengths: I 660–710, II 560–600, III 550–600, IV 725–750 µm. Chaetotaxy of legs I–IV: coxae 2, 2, 2, 1; trochanters 6 (1 1/3 1), 5 (1 1/3 0), 5 (1 1/3 0), 5 (1 1/3 0); femora 13 (2 5/4 2), 11 (2 5/3 1), 6 (1 4/1 0), 6 (1 4/1 0); genua 13 (2 6/3 2), 11 (2 5/2 2), 10 (2 4/2 2), 10 (2 5/2 1); tibiae 14 (2 6/4 2), 10 (2 4/2 2), 9 (2 3/2 2), 10 (2 4/2 2); tarsi I—49 (6 29/9 5), II–IV 18 (3 7/5 3). All legs with sclerotised claws and pulvillus with rounded lobes (Fig. 29). Pretarsus of legs II–IV with ambulacral stalk, tarsi I with sessile claws (Fig. 28). Coxae I with split on dorsal side, coxae IV with recesses on anterolateral side; coxae II–III with antero-dorsal spines: II with large sharp spine, III with smaller spine; coxae IV with 1–3–tined postero-ventral spine and alveolar vestige of second av seta. Male. (Figs 9–10, 24–27, 30, 31–36, n=10). Dorsal idiosoma. Dorsal idiosoma pear-shaped, 900–950 long, 625–675 wide, ornamentation and neotrichy of dorsal shields as in female. Ventral idiosoma. (Figs 9, 24–25, 31–34). Base of tritosterum 47–50 long and 30–32 wide, pilose laciniae 100–110 long, clamped under large subcapitular teeth (Fig. 27). Pair of St1 (42–47) setae in folded soft cuticle. Lyrifissures iv1 slit-shaped, located under setae St1. Second sternal platelet entire, in the form of a narrow strip, 12– 20 long and 55–62 wide, located exactly over the genital opening, with pair of St2 setae (35–40) and lyrifissures iv2 antero-laterally to platelet. Third sternal platelet divided in two parts on sides of genital opening, 80–87 long, 37–42 wide each part; with vertical irregular folding; with St3, St4 setae (32–37), with rounded lyrifissures iv3 and slit-shaped one iv4 from each side (Fig. 25, 34). Fourth sternal platelet (or post-genital) triangular in shape with elongated apex, 100–110 long and 65–75 wide, with relief pattern above St5 setae (25–27) (Figs 33, 34). Lyrifissures iv5 inserted on soft cuticle, postero-laterally of St5 setae. Genital opening located at level between coxae II–III, 45– 47 long and 47–49 wide, covered by two sclerites, with a pair of eugenital setae (25–27) on anterior sclerite; with pair of inner sclerites. Peritrematal shields similar to that female, with seta rx and six pore-like structures on each side. Arch of vertex with pair of slightly barbed setae z1 and pore po1. Peritremes similar to those of female, slightly undulating, very long (315–335). Pair of endopodal sclerites located at mid coxae III–IV, extends under third sternal platelets anteriorly. Exopodal sclerites fused with peritrematal shields in region of coxae III–IV. Ventri-anal shield broad, 375–380 long and 550–600 wide, fused with metapodal plates. Ornamentation, chaetotaxy and fusion with the opisthonotal shield as in female. Pair of setae Jv1 and anteriomost pair of glands gv2 inserted on anterior edge, other glands gv2 dispersed over the surface of ventri-anal shield. Pair of glands gv3 located antero-laterally to paraanal setae. Anal opening suboval (50–52 × 40–42); post-anal seta (30–32) longer than para-anal setae (22–25), with two lyrifissures on each valve. Gnathosoma. Male chelicera with sexual dimorphism of fixed digit (Fig. 26). Fixed digit of chelicera with extended distal edge; the same length as movable digit, with six medium-sized teeth and one small tooth at large apical outgrowth; with bifurcate pilus dentilis; with large suboval “window” of thinner and lighter cuticle layer in paraxial side. Movable digit of chelicera 100–105 long, tridentate in addition to apical hook, with serrate arthrodial corona at base of digit. Chelicera with dorsal seta, antiaxial and dorsal lyrifissures. Epistome, corniculi, internal malae and palpal structures as in female. Male subcapitular structure with sexual dimorphism—one pair of massive denticles (27 x 17) protruding at an angle outward, located between h2–h3 and pc setae, laterally to deutosternal groove (Figs 10, 27, 35–36). Legs. (Figs 9, 30, 32). Lengths: I 700–725, II 575–600, III 575–600, IV 725–750 µm. Chaetotaxy and morphology I, III–IV legs as in female. Legs II of male with sexual dimorphism. Femur II with three enlarged setae: the largest of all, elongated spine-like al2, and smaller spine-like al1, av1; genu II with modified spine-like al1 seta and tibia II with modified seta al1 as shown in figures 30, 32. Deutonymph (Figs 37–38, n=4). Dorsal idiosoma. Dorsal idiosoma suboval shape, 695–795 long, 500–600 wide, divided into two shields. Dorsal shields do not cover the entire body, leaving soft cuticle on the sides, with row of marginal setae. Podonotal shield does not form a vertex. Setae j1, z1 and po1 inserted on anterior margin of podonotal shield. Both shields tuberculate ornamentated over the entire surface, with neotrichy. Podonotal shield with four pairs of poroids po1– po4; opisthonotal with three pairs of poroids on shield Po1, Po3, Po4 and Po2 inserted on soft lateral cuicle. Area around five posterodorsal sigillae with smooth reticulation. Ventral idiosoma. Sternal shield entire, slightly reticulated with setae St1–St3 and lyrifissures iv1; setae St4, St5 and lyrifissures iv5 inserted on soft cuticle. Metapodal platelets wider than long (20–25 x 40–50); pair of postgenital sclerites located posteriorly setae St5. Peritremes 265–290 long, undulated, reaching to mid coxae I. Small part of sclerotised cuticle adjoins laterally to the peritrema between coxae II and III from each side. Marginal setae rx located on soft cuticle at lateral margins of ventral idiosoma at level between coxae II–III. Opisthogastral region with four pairs of glands gv2 dispersed over surface and 12–14 simple setae on each side. Anal shield separate, wider than long (110–115 x 150–160), with pair of para-anal and post-anal setae; with cribrum and pair of glands gv3 on anterio-lateral corners of shield. Opisthonotal shield curved on ventral side postero-laterally, with nine barbed marginal setae and 2–3 setae inserted asymmetrical. Gnathosoma. As in female. Legs. Lengths: I 575–600, II 475–500, III 475–500, IV 585–625. Chaetotaxy and morphology of legs as in female. Protonymph (Figs 39–40, n=7). Dorsal idiosoma. Dorsal idiosoma 525–610 long and 355–425 wide, with punctate ornamentation of podonotal and pygidial shields. Anterior margin of podonotum not curved ventrally, with pair of pilose setae j1 at large base. Podonotal shield with five pairs of setae in j -row (j1, j3–j6), z-row with pairs of recognisable z4 and z5 setae, with 13–15 pilose setae at lateral margins from each side; two pairs of r -setae on soft cuticle and three pairs of poroids po1, po2 and po4. Pygidial region presented by one large, broad pygidial shield and two medium size mesonotal platelets. Pygidial region with three pairs of pilose setae in J -row, where J1 setae located on paired mesonotal platelets. Another lateral 19 pilose setae and 9–10 marginal curved pilose setae present on each side. Also four pairs of poroids Po1–Po4 and five or seven posterodorsal sigillae present in pygidial region. Ventral idiosoma. Sternal region with setae St1–St3 and St5 inserted in soft folded cuticle; St5 minute. Peritrematal shields not distinct. Peritremes short (60–67), with internal cell structure; with thin ducts leading from stigmata. Two pairs of adgenital gland pores gv2 below coxae IV visible. Metapodal platelets (7–8 x 17–18) present. Opisthogastric area with five pairs of simple setae inserted in soft cuticle.Anal shield subtriangular form, ornamented with tubercles and folds, 93–95 long and 105–117 wide, with cribrum, pair of glands gv3 at antero-lateral margins; with para-anal and post-anal setae. Opisthonotal shield curved on the ventral side, not connected with anal shield; with 3–4 setae on sclerotised ornamented cuticle and eight marginal curved pilose setae on each side. Legs. Lengths: I 465–490, II 390–415, III 390–415, IV 460–485. Chaetotaxy of legs I–IV: coxae 2, 2, 2, 1; trochanters 4, 4,4, 4; femora 10, 8, 5, 4; genua 8, 6, 6, 5; tibiae 8, 7, 7, 7; tarsi II–IV: 17, 17, 17. Material examined. Holotype female, Russia, Baikal region, environs of Tankhoi village, Baikal Natural Biosphere Reserve, Khamar-Daban Ridge, 51 33’ N, 105 09’ E, 700 m a.s.l., Abies sibirica - Pinus sibirica taiga, in litter, 14 August 2014, coll., L.V. Petrozhitskaya. Paratypes: 6 females, 5 males, same data as holotype; 2 males, same geographical data, 1000 m a.s.l., tall grass alpine meadow with sparse trees of Abies sibirica, in soil, 13 August 2014, coll. L. V. Petrozhitskaya; 4 females, 4 males, Baikal region, environs of Vydrino village, Khamar-Daban Ridge, 51 23’ N, 104 38’ E, 500 m a.s.l., direction to Taltsinskii Peak, Abies sibirica - Pinus sibirica taiga, in litter, 23 June 2021, coll. I.I. Marchenko; 11 females, 4 males, same geographical data, 700 m a.s.l., direction to Taltsinskii Peak, Abies sibirica - Pinus sibirica taiga, in litter, 26 June 2021, coll. I.I. Marchenko; 1 males, Chitinskaya Oblast (now—Zabaikalskii Krai), Kyra District, Sokhondinskii Nature Reserve, 49 48’ N, 111 12’ E, 1600 m a.s.l., cordon Lukovoe, Larix sibirica – Pinus sibirica taiga, in litter, 12 June 1991, coll. D. V. Logunov; 2 females, Krasnoyarskii Krai, Eastern Sayan Ridge, Natural Reserve “Stolby”, mountain taiga with Pinus sylvestris, Abies sibirica, Larix sibirica, in litter, 55 56’ N, 92 44’ E, 500 m a.s.l., 30 August, 21 September 1972, coll. T.S. Sukhova. Other material: 4 protonymphs, Russia, Baikal Region, environs of Tankhoi village, Baikal Natural Biosphere Reserve, Khamar-Daban Ridge, 51 33’ N, 105 09’ E, 700 m a.s.l., Abies sibirica - Pinus sibirica taiga, in litter, 14 August 2014, coll., L. V. Petrozhitskaya; 2 protonymphs, same geographical data, 1000 m a.s.l., tall grass alpine meadow with sparse trees of Abies sibirica, 13 August 2014, coll. Petrozhitskaya; 4 deutonymphs, 9 protonymphs, Baikal Region, environs of Vydrino village, Khamar-Daban Ridge, 51 23’ N, 104 38’ E, 500 m a.s.l., Abies sibirica - Pinus sibirica taiga, in litter, 23 June 2021, coll. I.I. Marchenko; 2 deutonymphs, 3 protonymphs, same geographical data, 700 m a.s.l., direction to Taltsinskii Peak, Abies sibirica - Pinus sibirica taiga, in litter, 26 June 2021, coll. I.I. Marchenko. Etymology. The specific name dracunculus is Latin, little dragon: dracon (dragon) + unculus (little). This name associated with the structural features of a pair of massive subcapitular denticles in male in form of fangs like in mythical dragons. Remarks.Adults of Baikalozercon dracunculus differs from B. irbis as follows—first species with ornamentation of central part of opisthonotal shield in the form of a network of small tubercles; pair of posteriomost marginal setae in R -row of opisthonotal shield like other R -setae in shape and length. Female of B. dracunculus with axe-form genital shield. Movable digit of chelicera in both sexes of B. dracunculus with three teeth. Males have significant differences in sternal area, so B. dracunculus without first sternal platelet, second platelet in form of a narrow strip, fourth sternal platelet (or post-genital) triangular in shape with elongated apex. Male subcapitulum of B. dracunculus with pair of massive denticles between h2–h3 and pc setae. Male legs II of B. dracunculus with sexual dimorphism in form of some modified setae: three enlarged femur setae— al1, al2 and av1; one genu seta al1 and one tibia seta al1.Published as part of Marchenko, Irina I., 2022, Description of new genus Baikalozercon (Acari: Mesostigmata: Zerconidae) with two new species from South Siberia Mountains (Russia), pp. 301-333 in Zootaxa 5120 (3) on pages 304-318, DOI: 10.11646/zootaxa.5120.3.1, http://zenodo.org/record/638938
Politicheskaja i kul'turnaja zhizn' russkoj kolonii v Rime. Po materialam arxiva Biblioteki imeni Gogolja
No full textemigrazione russa in Itali
Gamasiphis ochotensis Marchenko, 2013, sp. n.
No full textGamasiphis ochotensis sp. n. Diagnosis of adults (female and male). Anteromedial extension of epistome aciculate; all idiosomal setae aciculate; podonotal region of dorsal shield with 23 pairs of setae; opisthonotal region with 12 pairs of setae; seta j 4 about 0.9 times as long as distance between its base and base of j 5; seta z 6 about as long as j 6; setae s 3 and s 6 about 0.3 times as long as s 5; seta j 6 about 0.7 times as long as distance between its base and base of J 2; four pairs of J setae; two pairs of pre-sternal platelets; ventrianal shield with eight pairs of setae in addition to circum-anal setae (Jv 1 - Jv 5, Zv 1 - Zv 3); seta Zv 2 about 0.8 times as long as distance between its base and base of Zv 3; seta Jv 5 about 5 times as long as circum-anal setae; setae Jv 3 inserted at the level of unsclerotized line which partly separates the dorsal and ventrianal shields; seta Jv 5 inserted posterior to unsclerotized line which partly separates the dorsal and ventrianal shields; distance between ends of these unsclerotized lines equal to distance between bases of Jv 3; sclerotized diagonal section laterad of ventrianal shield is broad, with wide about 0.8 times as long as Zv 3 at the level of pore. Female. (Fig. 1–7) (five specimens measured). Gnathosoma: Fixed cheliceral digit 50–52 µm long with seven teeth in addition to apical tooth and a setiform pilus dentilis (Fig. 1). Movable cheliceral digit 48–50 µm long, with four teeth in addition to apical tooth. Dorsal cheliceral seta, lateral (antiaxial) and dorsal lyrifissures distinct. Epistome with anteromedian extension smooth and aciculate, with a pair of short anterolateral spines; some specimens with a pair of denticles between anteromedian extension and anterolateral spines (Fig. 2 A–B). Deutosternal groove of hypostome with eight rows of denticles, each bearing 6–14 denticles, except most basal row smooth (Fig. 3); anterior row V-shaped, followed by an inverted V-shaped row, subsequent rows roughly transverse; margins of groove not distinct. Setae h 1 and h 3 equal in length (25–30 µm), h 2 shorter (17–20 µm), Sc (h 4) (20–25 µm). Salivary styli well developed (Fig. 2 B). Internal malae fimbriate laterally. Corniculi 30–32 µm long, 12–15 µm wide at the widest point (Fig. 3). Palp chaetoxy 2-5 - 6-14 - 15; palp trochanter with one small ventral protuberance (Fig. 4); setae al 1 and al 2 of palp genu slightly stout; palp apotele 3 -tined. Dorsal idiosoma (Fig. 5): Dorsal shield entire, ovoid shape, smooth, totally covering dorsal surface; 410–430 µm long, 300–325 µm wide at level of coxa IV. Dorsal shield with 35 pairs of acicular setae. Podonotal region with 23 pairs of setae (j 1 - j 6, z 1 - z 6, s 1 - s 6, r 2 - r 6), 12 pairs of distinguishable lyrifissures (two pairs visible ventrally on mounted specimens) and two pairs of pores (mediad of r 3 and posterior to and mediad of r 6; visible ventrally on mounted specimens); with numerous sigilla posterior to j 5. Opisthonotal region with 12 pairs of setae (J 2 - J 5, Z 2 - Z 5, S 2 - S 3, R 2 - R 3); Z 5 slightly serrated; with 10 pairs of distinguishable lyrifissures (one pair visible ventrally on mounted specimens) and one pair of pores (gdZ 2, anterior and mediad to Z 2). Length of setae: j 1 (10–12), j 2 (25– 30), j 3 (40–45), j 4 (40–45), j 5 (45–50), j 6 (40–45), z 1 (7–10), z 2 (7–10), z 3 (35–40), z 4 (45–50), z 5 (40–45), z 6 (40–45), s 1 (7–10), s 2 (7–10), s 3 (10–12), s 4 (40–45), s 5 (40–45), s 6 (10–12), r 2 (7–10), r 3 (7–10), r 4 (7–10), r 5 (10–12), r 6 (7–10), J 2 (7–10), J 3 (7–10), J 4 (7–10), J 5 (7–10), Z 2 (7–10), Z 3 (7–10), Z 4 (7–10), Z 5 (60–62), S 2 (10–12), S 3 (10–12), R 2 (7–10), R 3 (10–12). Ventral idiosoma (Fig. 6): Base of tritosternum equal in length and wideth (12–17 µm), laciniae (70–75 µm) totally separated from each other, pilose. Pre-sternal area with two pairs of presternal platelets. Sternal shield reticulate anteriorly between st 1 and st 2, smooth posteriorly; 57–62 µm long at mid-line and 135–140 µm wide between coxae II and III; with four pairs of setae (st 1, st 2, st 4 acicular; st 3 stout), st 3 inserted about in transverse line and mediad to st 2; distance between st 3 – st 3 as long as st 3 seta (17–20 µm); and with four pairs of lyrifissures. Endopodal shields fused with and distinctly more sclerotised than sternal shield. Peritreme extending anteriorly to anterior margin of coxa I. Peritrematic shield fused with section of exopodal shield near to coxa IV, widest at level of posterior margin of coxa IV, with a lyrifissure posterior to stigma. Length of peritrematic-exopodal shield from stigma to posterior margin 70–75 µm, width 42–45 µm at level of posterior margin of coxa IV. Band of dorsal shield extending laterad to the fused peritrematic-exopodal shield ending sharply in posterior margin. Genital shield wider than long, 62–67 µm long and 100–102 µm wide, hyaline apex abutting the sternal shield; anterior margin rounded and posterior margin truncate, with a pair of setae st 5 and three pairs of sigilla; distance between st 5 - st 5 60–63 µm. Ventrianal shield with transverse striations anterior to Jv 4 and smooth posteriorly; 180–190 µm long from anterior margin to post-anal seta and 200–210 µm wide at widest point; with eight pairs of acicular setae (Jv 1 - Jv 5, Zv 1 - Zv 3) in addition to post-anal and para-anal setae; with five pairs of lyrifissures (antero-lateral margin of the shield, posterior to and laterad of Zv 1, posterior to and laterad of Zv 2, anterior to and mediad of Zv 3 and laterad of circum-anal seta); distance between Jv 5 and anterior margin of anal opening about 0.5–0.7 times as long as anal opening; seta Jv 5 about 5 times as long as circum-anal seta; post-anal seta about 4 times as long as para-anal setae, the latter situated at level of the posterior margin of anal opening. Dorsal and ventrianal shields partly separated by an unsclerotised line, the ends of this line reach the bases of Jv 3; seta Jv 3 situated at the level of this line; distance between Jv 3 and post-anal setae 70-80 µm. Sclerotised diagonal section laterad of ventrianal shield that connects the latter to the dorsal shield is broad, with one pair of pores; 18–20 µm wide at the level of pore; ending sharply at anterior part and ending broadly near of Zv 3 seta at posterior part. Length of ventral setae: st 1 (27–32), st 2 (25–30), st 3 (17–20), st 4 (25–27), st 5 (22–25), Jv 1 (20–25), Jv 2 (17–22), Jv 3 (20–25), Jv 4 (27–32), Jv 5 (50–55), Zv 1 (20–25), Zv 2 (20–25), Zv 3 (20–25), circum-anal (10–12) and post-anal seta (40–45). Spermatheca: Opening of spermathecal apparatus tubular, extending medially from base of coxa IV (Fig. 7). Other parts of spermatheca not clearly visible. Legs: Lengths: I: 320–330, II: 275–288, III: 230–250, IV: 325–345 µm. Chaetotaxy of legs I–IV: coxa 2, 2, 2, 1; trochanter 6, 5, 5, 5; femur (2 3 / 2 2 / 2 2), (2 3 / 1 2 / 2 1), (1 2 / 1 2 /0 0), (0 2 / 2 2 /0 0); genu (2 3 / 2 3 / 1 2), (2 3 / 1 2 / 1 2), (2 2 / 1 2 /0 1), (2 2 / 1 3 /0 0); tibia (2 3 / 2 3 / 2 2), (2 2 / 1 2 / 1 2), (2 1 / 1 2 / 1 1), (2 1 / 1 3 / 1 1). All leg setae acicular, except one antero-lateral pilose seta on trochanter II. All legs with pretarsus, each with elongate ambulacral stalk and a pair of strongly sclerotised claws, with three rounded pulvilli; claws of pretarsus I slightly smaller than others. Male. (Fig. 8–12) (five specimens measured). Gnathosoma: Fixed cheliceral digit 47–49 µm long, with six teeth in addition to apical tooth, with transverse line across the digit and a setiform pilus dentilis (Fig. 8 A–C). Movable cheliceral digit 45–47 µm long, with one tooth in addition to apical tooth. Spermatodactyl curved; with an internal canal along proximal part (2 / 3 length of spermatodactyl) and with distal part spatulate (1 / 3 length of spermatodactyl). Total length of spermatodactyl 65–70 µm, free process 30–35 µm long. Dorsal cheliceral seta, lateral (antiaxial) and dorsal lyrifissures distinct. Corniculi 25–27 µm long, 7–10 µm wide (Fig. 9). Epistome and hypostome as in female. Setae h 1 and h 3 equal length (25– 27 µm); setae h 1 and Sc equal length (20–25 µm) and slightly shorter than other. Palps as in female. Dorsal idiosoma: 375–400 µm long, 275–300 µm wide. Dorsal shield similar to that of female. Measurements of setae: j 1 (10–12), j 2 (25–30), j 3 (40–45), j 4 (40–45), j 5 (40–50), j 6 (35–40), z 1 (7–10), z 2 (7–10), z 3 (35–40), z 4 (40–50), z 5 (40–50), z 6 (40–50), s 1 (7–10), s 2 (7–10), s 3 (10–12), s 4 (40–50), s 5 (40–50), s 6 (10–12), r 2 (7–10), r 3 (7–10), r 4 (7–10), r 5 (10–12), r 6 (7–10), J 2 (7–10), J 3 (7–10), J 4 (7–10), J 5 (7–10), Z 2 (7–10), Z 3 (7–10), Z 4 (7– 10), Z 5 (55–65), S 2 (10–12), S 3 (10–12), R 2 (7–10), R 3 (7–10). Ventral idiosoma: Base of tritosternum 10–12 µm long and 15–18 µm wide proximally, lacinae (70–75 µm) totally separated from each other, pilose (Fig. 10). Except for the fusion of sternal and genital shields (sternogenital shield), shape, pattern and fusions of ventral shields as in female. Sternogenital shield reticulate between st 1 and st 2, smooth posteriorly; 100–110 µm long and 130–140 µm wide at widest point between coxae II and III; with five acicular setae (s t 1 – st 5), distance st 1 – st 1 45–50 µm, st 2 – st 2 70–75 µm, st 3 – st 3 80–85 µm, st 4 – st 4 80–85 µm and st 5 – st 5 70–75 µm; with four pairs of lyrifissures. Ventrianal shield 210–220 µm long from anterior margin to postanal seta and 200–210 µm wide at widest point; with eight pairs of setae (Jv 1 – Jv 5, Zv 1 – Zv 3) in addition to postanal and circum-anal setae; and with five pairs of lyrifissures (antero-lateral margin of the shield, posterior to and laterad of Zv 1, posterior to and laterad of Zv 2, anterior to and mediad of Zv 3 and laterad of circum-anal seta); postanal seta about 4 times as long as circum-anal seta. Length of ventral setae: st 1 (25–30), st 2 (25–30), st 3 (20–25), st 4 (25–30), st 5 (20–25), Jv 1 (20–25), Jv 2 (20–25), Jv 3 (20–25), Jv 4 (30–35), Jv 5 (45-50), Zv 1 (20–25), Zv 2 (20– 25), Z 3 (20–25), circum-anal (10–12) and post-anal seta (40–45). Legs: Lengths: I: 300–315, II: 260–275, III: 230–245, IV: 310–325 µm. Chaetotaxy of legs similar to that of female. Leg II with one antero-lateral pilose seta on trochanter (similar to female); femur with two ventral spur-like setae (one large spur 30–35 µm length and one small spur on elevated base); genu with two small ventral spur-like setae; tibia with one small ventral spur-like seta; tarsus with one acicular ventral seta on raised base (Fig. 11–12). All other setae of legs acicular. All legs with pretarsus, elongate ambulacral stalk, a pair of strongly sclerotised claws, with three rounded pulvillus; claws of pretarsus I slightly smaller than others, similar to those of female. Material examined. Holotype female, 33 paratype females and 11 paratype males from litter of forest with Betula ermanii —bamboo Sasa spp. and Abies sakhalinensis — Picea glehnii at Chekhov Mounting (47 °00' N, 142 ° 50 ' E), Susunaiskii Ridge, south of Sakhalin Island, Russia, 9 August 1990, collected by I. Volonikhina (Marchenko); 15 paratype females and 14 paratype males from litter at forest with Abies sakhalinensis; Querqus mongolica — Betula ermanii and forest with Ulmus spp. at south of Kunashir Island (43 ° 50 ' N, 145 ° 30 ' E), Russia, 18 July and 20 July 1989, collected by I. Volonikhina (Marchenko); two paratype females and three paratype males from bog with moss and Ledum palustre, in moss at environs of Yuzhno-Kurilsk, Kunashir Island, Russia, 4 August 1989, collected by I. Volonikhina (Marchenko); three paratype female and two paratype males in litter with bushes of Alnus spp. and Taxus cuspidate at Shikotan Island (43 ° 48 ' N, 146 ° 51 ' E), 30 October 1986, collected by S. Kalabin. Holotype and 51 paratypes (30 females and 21 males) deposited at Zoological Museum of the Institute of Systematics and Ecology of Animals, Novosibirsk, Russia; 32 paratypes (23 females and nine males) deposited at arthropod collection of Manchester Museum, Manchester, United Kingdom. Other examined material: 11 females and two males from mosses – lichens – blueberries (Vaccinum spp.) and in litter in a forest of Abies sakhalinensis – Picea glehnii and Betula ermanii –bamboo Sasa spp. at Chekhov Mounting, Susunaiskii Ridge, south of Sakhalin Island, Russia; five females from litter of mixed forest at environs of Ogonki, South Sakhalin, Russia; eight females and six males from litter in a forest of Abies sakhalinensis, in litter of mixed forest with Betula ermanii and Alnus spp., in a broadleaved forest, in a fumarole field with Pinus pumila, in bog with moss and Ledum palustre, at Kunashir Island, Russia; two females from bushes of Juniperus sargentii and Alnus spp. at Shikotan Island, Russia. Etymology. The name ochotensis refers to the name of Okhotsk Sea that bathes Sakhalin and Kuril Islands from the North. Remarks. Gamasiphis ochotensis sp. n. is most similar to Gamasiphis angaridis Marchenko, 2013, but females of the latter have setae s 3 and s 6 as long as s 5; distance between bases of st 3 – st 3 about 0.5 times as long as st 3; seta Jv 3 inserted posteriorly of unsclerotized line which separates partly the dorsal and ventrianal shields; sclerotised diagonal section laterad of ventrianal shield is narrow, with width at the level of pore about 0.3 times shorter than length of Zv 3; and males have spermatodactyl widest at proximal part and gradually narrowing apically, and tarsus II with a spur-seta. It is also similar to Gamasiphis lanceolatus Karg, 1987, but females of the latter have 22 pairs of podonotal setae (s 1 absent) and 13 pairs of opisthonotal setae (S 1 present); dorsal setae j 2 – j 6, z 3 – z 6, s 4 – s 5 and z 5 distally expanded; and males have spermatodactyl with very narrow distal part, about 0.5 times as long as total length of spermatodactyl.Published as part of Marchenko, Irina I., 2013, A new species of Gamasiphis Berlese (Acari: Ologamasidae) from Russia (Sakhalin and Kuril Islands) with a key to the Asian species, pp. 172-180 in Zootaxa 3741 (1) on pages 173-177, DOI: 10.11646/zootaxa.3741.1.6, http://zenodo.org/record/21923
Wavefield focusing using a generalised, potentially asymmetric homogeneous Green's function
No full textMarchenko-type integrals typically relate so-called focusing functions and Green's functions via the reflection response measured on the open surface of a volume of interest. Originating from one dimensional inverse scattering theory, the extension to two and three dimensions set in motion various new developments regarding imaging in complex materials. This extension, however, is based on wavefield decomposition inside the volume and a truncated medium state, i.e. a version of the medium that is reflection-free underneath the focusing location, suggesting that evanescent, refracted and diving waves cannot be included in the representation. We elaborate on a new derivation for Marchenko-like integrals that (i) extends the concept of wavefield focusing by using a generalised homogeneous Green's function, (ii) is based on partial differential equations and thereby allows for additional insights and a new physical intuition for Marchenko equations, (iii) unifies wavefield focusing for open and closed boundary systems, (iv) does not require wavefield decomposition or a truncated medium state, thus including the full wavefield Green's function, (v) enables using forward modelling to obtain, e.g., Marchenko-type, time-compact focusing functions. We place a particular focus on the latter point, illustrating and investigating how to solve the underlying partial differential equations for various types of focusing functions. This paves the way for a deeper understanding of focusing functions as well as advanced full wavefield Marchenko schemes. While the derivations are generally presented for the 3D case, we show numerical examples in 1D.Applied Geophysics and Petrophysic
Density and stratigraphy of firn at Lomonosovfonna derived from shallow cores in 1997-2015
No full textThe present dataset contains measurements of density and observations of stratigraphy in the subsurface snow/firn/ice done at Lomonosovfonna during 1997-2015. The variables are named according to the year, when the data was derived: "LF" for Lomonosovfonna and "NN" corresponds to the year, e.g. 97 - 1997, 07 - 2007. Most variables contain the following fields:rho* - density measurements: column 1 - depth of sample top, m; column 2 - depth of sample bottom, m; column 3 - density values, kg m^-3;rho*_reg - density measurements on a regular 1 cm spaced grid, gaps are filled by linear interpolation and extrapolated using "nearest neighbor" logic; column 1 - depth, m; column 2 - density values, kg m^-3;strat - stratigraphy: column 1 - depth of sample top, m; column 2 - depth of sample bottom, m; column 3 - stratigraphy coded as: 1 - snow, 2 - firn, 3 - ice lens;lat* - latitude, degrees to the North of equator;lon* - longitude, degrees to the East of the prime meridian;h* - elevation, m above the sea level.LF97: Six shallow cores were drilled in spring 1997 approximately along the centerline of Nordenskiöldbreen. A system of mass balance stakes at locations of the cores is maintained by Uppsala university. The density is approximated from visual stratigraphic description according to the classification suggested by Pohjola et al., 2002 (see Table 1 there). The density values are the result of averaging of density values ascribed to stratigraphic units identified in core pieces and weighted by their respective thicknesses.LF99: Three shallow cores were drilled in the end of April 1999 at the location where in 1997 a 120 m long ice core was drilled. The cores were drilled along a North-South oriented line with a spacing of 2.5 m between the neighboring cores. The fields in the LF99 variable are named accordingly: fields with the data from the southern location contain "S", northern - "N", central - "C". The field and laboratory work was done by Håkan Samuelsson. Methods and analysis are described in detail in the Master Thesis: "Distribution of melt layers on the ice field Lomonosovfonna, Spitsbergen", defended at Uppsala University in 2001.LF08: One shallow core was drilled by Sanja Forsström, Elisabeth Isaksson, Veijo Pohjola and Jim Hedfors within ca 100 from the location where in 1997 a 120 m long ice core was drilled. Density was measured using two different methods at the cold lab of the Norwegian Polar Institute in Tromso by Sanja Forsström and Tonu Martma. The structure field "rho" contains values calculated from measured geometrical dimensions of the core samples and weights. The fields "rhoDEPcorepieces", "rhoDEPionsamples" and "rhoDEPisotopesamples" contain density values measured using dielectric profiling in three sets of samples.LF12: The core was drilled by Veijo Pohjola and Rickard Pettersson on the 13 of April 2012. Field notes done by Sergey Marchenko. Cold lab operations were done by Sergey Marchenko and Elena Klimenko at the University Centre in Svalbard (UNIS) in Longyearbyen, Norway during 26 April - 3 May 2012. Density was measured in cylindrical and cuboid samples prepared using a band saw to ensure regular shape. The structure field "rho_c" contains density measurements done using cylindrical core pieces. The structure field "rho_rb" contains density measurements done using relatively long cuboid samples prepared from cylindrical core pieces using a band saw. The structure field "rho_rs" contains density measurements done using shorter cuboid samples prepared from the longer pieces using a band saw. The structure field "rho_reg" is based on the "rho_rs" structure field.LF13: The core was drilled by Christian Zdanowics, Dorothee Vallot and Veijo Pohjola in April 2013 and later analyzed by Carmen Vega in the cold lab of the Norwegian Polar Institute in Tromso, Norway.LF14: The core was drilled by Veijo Pohjola and Ward van Pelt in the end of March 2014. Field notes are done by Veijo Pohjola. Cold lab operations were done by Sergey Marchenko, William Kohler and Elisbeth Isaksson in the Norwegian Polar Institute facilities in Tromso, Norway, during 05-10 of October 2014. Density was measured in cylindrical or cuboid samples prepared using a band saw to ensure regular shape.LF15: the core was drilled by Veijo Pohjola and Ward van Pelt on the 15th of April 2015. Field notes are done by Veijo Pohjola. Cold lab operations were done by Sergey Marchenko, Glennda Villanflor and Elisbeth Isaksson in the Norwegian Polar Institute facilities in Tromso, Norway, during 02-05 of November 2015. Density was measured in cylindrical or cuboid samples prepared using a band saw to ensure regular shape. The data is used in the following publications:1) Marchenko, S., Cheng, G., Lötstedt, P., Pohjola, V., Pettersson, R., van Pelt, W., Reijmer, C., (2019). Thermal conductivity of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements, The Cryosphere Discussions, doi: 10.5194/tc-2018-294;2) Marchenko, S., van Pelt, W., Claremar, B., Pohjola, V., Pettersson, R., Machguth, H., Reijmer, C., (2017). Parameterizing Deep Water Percolation Improves Subsurface Temperature Simulations by a Multilayer Firn Model, Frontiers in Earth Science, doi: 10.3389/feart.2017.00016;3) Marchenko, S., Pohjola, V., Pettersson, R., van Pelt, W., Vega, C., Machguth, H., Bøggild C., Isaksson, E., (2017). A plot-scale study of firn stratigraphy at Lomonosovfonna, Svalbard, using ice cores, borehole video and GPR surveys in 2012-14, Journal of Glaciology, doi: 10.1017/jog.2016.118;4) Pohjola, V., Moore, J., Isaksson, E., Jauhiainen, T., van de Wal, R., Martma, T., Meijer, H., Vaikmäe, R., (2002). Effect of periodic melting on geochemical and isotopic signals in an ice core from Lomonosovfonna, Svalbard, Journal of Geophysical Research, doi:10.1029/2000JD000149;5) Isaksson, E., Pohjola, V., Jauhiainen, T., Moore, J., Pinglot, J., Vaikmäe, R., van De Wal, R., Hagen, J.O., Ivask, J., Karlöf, L., Martma, T., Meijer, H., Mulvaney, R., Thomassen M., van den Broeke, M., (2001). A new ice-core record from Lomonosovfonna, Svalbard: Viewing the 1920–97 data in relation to present climate and environmental conditions, Journal of Glaciology, doi:10.3189/172756501781832313;6) Pälli, A., Kohler, J., Isaksson, E., Moore, J., Pinglot, J., Pohjola, V., & Samuelsson, H., (2002). Spatial and temporal variability of snow accumulation using ground-penetrating radar and ice cores on a Svalbard glacier, Journal of Glaciology, doi:10.3189/172756502781831205;7) van Pelt, W, Pettersson, R., Pohjola, V., Marchenko, S., Claremar, B., and Oerlemans, J., (2014). Inverse estimation of snow accumulation along a radar transect on Nordenskiöldbreen, Svalbard, Journal of Geophysical Research, doi:10.1002/2013JF003040;8) Vega, C., Pohjola, V., Beaudon, E., Claremar, B., van Pelt, W., Pettersson, R., Isaksson, E., Martma, T., Schwikowski, M., Bøggild, C., (2016). A synthetic ice core approach to estimate ion relocation in an ice field site experiencing periodical melt: a case study on Lomonosovfonna, Svalbard, The Cryosphere, doi:10.5194/tc-10-961-2016;</div
Baikalozercon irbis Marchenko 2022, sp. nov.
No full textBaikalozercon irbis sp. nov. (Figures 41–63) Female (Figs 41–53, n=10) Dorsal idiosoma (Fig. 41). Idiosoma pear-shaped, 1025–1060 long, 675–725 wide, divided into two shields that cover the entire dorsal idiosoma. Podonotal shield with festoon ornamentation, except mid-posterior region with smooth reticulation, anterior margin curved ventrally to form a vertex. The most anterior setae j1 the longest (55–63) of all setae, pilose, inserted on large bases on anterior margin of idiosoma. Vertex with setae z1, the shortest (20–25), slightly barbed and a pair of pore-like structures (glands) po1 visible on ventral side. All medial and lateral setae on dorsal shields slightly pilose (visible only with the use of oli immersion), located on rounded bases; marginal r-R setae inserted on rounded tubercles, slightly curved and feathered. Podonotal shield neotrichous, with 25–27 lateral setae of z, s -series (25–27), 25–29 medial setae of j -series (four pairs of them longer 35–37 long, others as lateral), 15–16 marginal setae of r -series (35–37) from each side; and four pair of pore-like structures (glands) po1–po4. Regions of podonotum between medial and lateral setae with groups of sigillae of longitudinal location. Opisthonotal shield neotrichous, with smooth reticulation in median region and festoon ornamentation in lateral regions (Figs 41, 50). Setae of J, Z and S -series in asymmetrical locations. Setae of J, Z and S series in asymmetrical position. Medial setae of J- series 15–23, 22–25 long; lateral setae 31–36, 30 long; and marginal R -setae 15–18 on raised tubercles (40–43) on each side; regions free of setae located in the depressions of the shield with two pairs of sigillae from each side. Region surrounding 6–7 posterodorsal sigillae with smooth reticulation and punctate at the corners of the cells. Four pairs of pores Po1–Po4 inserted in opisthonotum. Cribrum visible on the terminal end of shield between the posteriormost marginal setae. Ventral idiosoma. (Figs 42–47). Base of tritosternum 63–65 long and 35–37 wide, paired pilose laciniae free from each other along entire length, 107–112 long. First sternal platelet 50–52 long (along a vertical line through setae St1) and 100–107 wide, single, hollow inside; with irregular wavy edges along inner contour; with pair of St1 setae (60–63) and slit-shaped lyrifissures iv1 (Figs 42, 45). Second sternal platelet formed by two small separate rounded platelets with diagonal groove (25–27 x 25–35), with pair of St2 setae (55–57) and oval lyrifissures iv 2 in lateral position. Third sternal platelet entire, the largest, 137–142 long and 177–112 wide, with folded reticulation structure of cuticle; with a medial incision dividing the shield into two lobes in posterior part, not reaching level of St4 setae; with two pairs of setae St3, St4 of the same length (47–50); and slit-form lyrifissures iv3 (Figs 42–47). Pair of large rounded glands gv1 located at the antero-lateral edge of the hyaline membrane surrounding largest sternal shield. Genital shield sack-shaped with extension in anterior and posterior parts, with narrowing in anterior third, 125–140 long and 155–170 wide at widest part; with setae St5 (20–25), and pair of internal genital sclerites.Anterior part of the genital shield (above narrowing) has a different cuticle structure than the posterior, as shown in Fig. 43. Lyrifissures iv5 inserted on soft cuticle outside of genital shield. The genital shield is surrounded by trapeziform membrane with mid-anterior incision opposite the same on the largest sternal shield. In typical position, anterior part of genital shield located under the largest sternal shield not reaching level of St4 setae. When pressed down on a slide, the third sternal and genital shields are displaced vertically as shown in Fig. 43. One pair of post-genital sclerites inserted between genital and ventri-anal shields. Endopodal sclerites present around of coxae III–IV. The anterior part of endopodal sclerite can partially extends under third sternal platelet. Exopodal sclerites fused with peritrematal shields in region of coxae III–IV. Peritrematal shields strongly sclerotised, ornamented with festoon reticulation along entire length; fused anteriorly forming a vertex. Six pairs of poroids inserted in peritrematal shields: gp1–gp3 and ip1–ip3 and two pairs of short setae of the same length (12–14): barbed z 1 in vertex and simple rx seta located opposite coxae III. Peritremes slightly undulating, very long, extending from mid coxa IV to mid coxa I, 350–370 long, with inner partitions. Metapodal platelets large, elongated in horizontal direction (15–20 x 105–120). Gland pores gv2 multiple, dispersed over surface: one pair of glands openings inserted on soft cuticle postero-laterally of genital shield, other 7–9 located on ventri-anal shield from each side. Ventri-anal shield broad, 425–440 long and 675–725 wide, fused to opisthonotal shield posteriorly at level of post-anal setae, with festoon reticulation in region above glands gv3, and smooth reticulation surround anal opening; with 10–11 opisthogastric smooth setae (27–30) and 11 marginal opisthonotal setae, pilose, slightly curved, on rounded tubercles from each side. Setae of Jv and Zv- rows are clearly distinguished (Jv1–Jv3, Zv1–Zv3), other setae in asymmetrical location. Anal area with smooth para-anal (20–25) and post-anal (30–35) setae; anal opening (52–62 x 50–52) with two pairs of lyrifissures on each valve (Fig. 49); cribrum extends from ventral to dorsal sides of idiosoma between the longest (58–70), barbed posteriormost marginal setae (Fig.42). Pair of glands gv3 located antero-laterally of paraanal setae. Gnathosoma. (Figs 48, 51–53) Movable digit of chelicera 112–114 long, with four teeth in addition to apical hook; fixed digit 114–116 length, with seven (six in some specimens) teeth in addition to apical hook and tubular pilus dentilis with rounded tip (Fig. 51). Chelicera with dorsal seta (45–46), lateral (antiaxial) and dorsal lyrifissures; with serrated arthrodial corona and suboval area (“window”) on paraxial side with thin cuticle. Epistome (Fig. 52) with irregularly serrated lateral edges and smooth, long, bifurcated median projection. Corniculi 55–57 long and 27–29 wide. Internal malae protrude distinctly beyond corniculi (Fig. 53) with smooth elongated branches, barbed at base. Deutosternal groove with seven transverse denticulate rows, with four paired curved lateral transverse lines. Setae h1–h3 smooth: h1 (67–69) the longest, seta h2 (43–45) shorter than h3 (63–65); pc (37–40) serrated. Dorsal side of gnathosoma with pair of paraxial lanceolate structures –“staples” between chelicera shaft and epistome. Palpal chaetotaxy 2–5–6–13–15, palps with five free segments; palp trochanter with seta al1 long and pilose in distal third, seta al2 short and smooth; palp genu with seta al1 smooth and al2 pilose in distal third; palp tarsal claw two-tined. Legs. (Figs 44, 61). Lengths: I 750–775, II 625–675, III 625–675, IV 775–790 µm. Chaetotaxy of legs I–IV: coxae 2, 2, 2, 1; trochanters 6 (1 1/3 1), 5 (1 1/3 0), 5 (1 1/3 0), 5 (1 1/3 0); femora 13 (2 5/4 2), 11 (2 5/3 1), 6 (1 4/1 0), 6 (1 4/1 0); genua 13 (2 6/3 2), 11 (2 5/2 2), 10 (2 4/2 2), 10 (2 5/2 1); tibiae 14 (2 6/4 2), 10 (2 4/2 2), 9 (2 3/2 2), 10 (2 4/2 2); tarsi I—49 (6 29/9 5), II–IV 18 (3 7/5 3). All legs with sclerotised claws and pulvillus (Fig. 61). Pretarsus of legs II–IV with ambulacral stalk, tarsi I with sessile claws. Coxae I with split on dorsal side, coxae IV with recesses on anterolateral side; coxae II–III with antero-dorsal spines: II with large sharp spine, III with small one; IV coxae with 1–3–tined postero-ventral spine and alveolar vestige of second av seta. Male. (Figs 54–59, n=10). Dorsal idiosoma. (Fig. 56). Dorsal idiosoma pear-shaped, 985–1000 long, 660–700 wide, ornamentation and neotrichy of dorsal shields as in female. Ventral idiosoma. Base of tritosterum 47–50 long and 32–37 wide, pilose laciniae 108–112 long. First sternal platelet paired, divided, irregular in form, with ragged outlines, 47–50 long and 37–50 wide, with seta St1 (47–50) and slit lyrifissures iv1 on each part (Fig. 54). Second sternal platelets entire, with irregularly rounded anterior margin and truncated posterior one, with festoon reticulation, 45–50 long and 62–65 wide, with pair of setae St2 (43–45) and lyrifissures iv2 laterad platelet, located on soft cuticle. Truncate posterior edge of second sternal platelet is adjacent to genital opening. Third sternal platelet divided in two parts, adjacent to the genital opening on the sides, with vertical reticulation, 95–105 long, 32–37 at widest part; with setae St3, St4 (32–35), with rounded glands gv1 on anterior edge and slit lyrifissures iv 3 in central region on each side. Fourth sternal platelet (or post-genital) consists of two fragments: small anterior 25–37 x 17–25 and large subtriangular posterior 55–62 x 82–100 with pair of setae St5 (25–27), and lyrifissures iv5 inserted on soft cuticle lateral to St5 setae. Genital opening located at level between coxae II–III (50–52 x 50–55), covered by two sclerites, with a pair of eugenital setae (25–27) on anterior sclerite; with pair of inner sclerites (Figs 54, 57–58). Peritrematal shields similar to those of female, with smooth rx seta and six pore-like structures on each side. Arch of vertex with pair of slightly barbed setae z1 and pore po1. Peritremes similar to those of female, slightly undulating, very long (325–350). Two pairs of endopodal sclerites almost fused with each other located around coxae III–IV; extend under third sternal platelets anteriorly. Exopodal sclerites fused with peritrematal shields in region of coxae III–IV. Ventri-anal shield broad, 415–440 long and 600–650 wide, fused with metapodal platelets. Ornamentation, chaetotaxy and fusion with the opisthonotal shield as in female. Gland pores gv2 (9–15) dispersed over the surface of ventri-anal shield. Pair of glands gv3 located antero-laterally to paraanal setae. Anal opening suboval 55–57 × 47–50. Post-anal seta (30–32) longer than para-anal setae (20–25), with two lyrifissures on each valve. Gnathosoma. (Fig. 55). Male chelicera with sexual dimorphism of fixed digit. Fixed digit of chelicera the same length as movable digit, with six or seven (in different specimens) medium-sized teeth and apical large outgrowth; with tubular protruding pilus dentilis; with large suboval “window” of thinner and lighter cuticle layer in paraxial side. Movable digit of chelicera 97–103 long, with four teeth in addition to apical hook, with serrate arthrodial corona at base of digit. Chelicera with dorsal seta, antiaxial and dorsal lyrifissures. Epistome, corniculi, internal malae and palpal structures as in female. Male subcapitulum without sexual dimorphism. Legs. (Figs 59–61). Lengths: I 700–735, II 580–600, III 580–600, IV 715–735 µm. Chaetotaxy and morphology of legs I, III–IV as in female. Legs II of male with sexual dimorphism due to some modified setae on femur II: the largest, elongated spine-like seta al2, and smaller and thinner spine-like al1 (Fig. 60). Other segments of legs II including genu and tibia without clearly distinct modified setae. Deutonymph not found. Protonymph (Figs 62–63, n=12). Dorsal idiosoma (Fig. 62). Dorsal idiosoma 550–600 long and 385–415 wide. Podonotal shield with festoon ornamentation except area between j6–j5 setae with smooth reticulation. Anterior margin of podonotum with pair of pilose setae j1 at large base. Podonotal shield with five pairs of setae in j -row (j1, j3–j6), z -row with pairs of recognisable z4 and z5 setae, with about 15 pilose setae at lateral margins from each side; three r -setae on soft cuticle on each side and four pairs of poroids po1–po4. Pygidial shield with tuberculate and festoon ornamentation except area around 5–7 posterodorsal sigillae with smooth reticulation. Pygidial region presented by one large, broad pygidial shield and two medium sized mesonotal platelets; with three pairs of pilose setae in J -row, J1 located on paired mesonotal platelets; another 12–13 pilose lateral setae and 8–9 marginal pilose curved R setae located on each side of shield. Also poroids Po1 inserted on mesonotal platelets and Po2–Po4 on pygidial shield. Ventral idiosoma (Fig. 63). Sternal region with setae St1–St3 and St5 inserted in soft cuticle with slight ornamentation; seta St5 minute. Peritrematal shields not distinct. Peritremes short (62–65), with internal cell structure; with thin ducts leading from stigmata. Pair of gland pores gv2 located posteriad IV coxae. Metapodal platelets (10–12 x 18–23) present. Opisthogastric area with five pairs of simple setae inserted in soft cuticle. Anal shield subtriangular, ornamented with tubercles and folds, 105–125 long and 130–150 wide with cribrum, pair of glands gv3 at antero-lateral margins; with para-anal and post-anal setae. Opisthonotal shield curved on ventral side, not connected with anal shield; with 1–3 setae on sclerotised ornamented cuticle and eight marginal curved pilose setae from each side. Legs. Lengths: I 465–475, II 400–425, III 400–425, IV 475–500. Chaetotaxy of legs I–IV: coxae 2, 2, 2, 1; trochanters 4, 4, 4, 4; femora 10, 8, 5, 4; genua 8, 6, 6, 5; tibiae 8, 7, 7, 7; tarsi II–IV: 17, 17, 17. Material examined. Holotype female, Russia, Baikal Region, environs of Tankhoi village, Baikal Natural Biosphere Reserve, Khamar-Daban Ridge, 51 33’ N, 105 09’ E, 1100 m a.s.l., tall grass alpine meadow with sparse trees of Abies sibirica, in soil, 13 August 2014, coll. L. V. Petrozhitskaya. Paratypes: 8 females, 4 males, same data as holotype; 2 females, 2 males, same geographical data, valley of Osinovka river, 1100 m a.s.l., 13 August 2014, coll. L. V. Petrozhitskaya; 1 male, same geographical data, alpine tundra, 1600 m a.s.l., in litter-soil, 12 August 2014, coll. I.I. Marchenko. Other material: 11 protonymphs, same data as holotype; 1 protonymph, same geographical data as type material, alpine tundra, 1600 m a.s.l., 12 August 2014, coll. I.I. Marchenko. Etymology. The specific name irbis refers to snow leopard in Turkic and Mongolian languages. The irbis—snow leopard inhabitant of highlands of Central Asia. New species Baikalozercon irbis also inhabits severe highlands in Siberia. Remarks. Adults of Baikalozercon irbis differs from B. dracunculus: first species with festoon ornamentation of central part of opisthonotal shield; pair of posteriomost marginal R setae of opisthonotal shield straight and longer than others. Female of B. irbis has sack-form genital shield with constriction in anterior third. Movable digit of chelicera in both sexes of B. irbis with four teeth. Males have significant differences in sternal area, so B. irbis with first sternal platelet irregular in form, second platelet irregularly hemispherical form, fourth sternal platelet (or post-genital) fragmented, consisting of two parts: anterior smaller and posterior larger. Male gnathosoma of B. irbis without sexual dimorphism. Male II legs of B. irbis with sexual dimorphism in form of two modified enlarged setae of femur al1, al2. Distribution. Mites of the new genus Baikalozercon are restricted in distribution to the mountains of Southern Siberia. Baikalozercon dracunculus is known from three localities: “Stolby” Nature Reserve in Eastern Sayan; Khamar-Daban Ridges in Baikal Region (Buryatia and Irkutskaya Oblast); and Sokhondinskii Nature Reserve in Zabaikalskii Krai, while B. irbis is found only in the highlands of Khamar-Daban Ridge (Fig. 64). Photos of localities along altitudinal gradient of Khamar-Daban Ridge are shown in Figures 65–71. Two species of the new genus Baikalozercon coexist on the same Khamar-Daban Ridge, but inhabit different altitudes— B. dracunculus occurs at altitudes of 500–700 m a.s.l. in mountain taiga and B. irbis at 1000–1600 m in alpine sparse forest with meadow and alpine tundra (Fig. 72).Published as part of Marchenko, Irina I., 2022, Description of new genus Baikalozercon (Acari: Mesostigmata: Zerconidae) with two new species from South Siberia Mountains (Russia), pp. 301-333 in Zootaxa 5120 (3) on pages 318-328, DOI: 10.11646/zootaxa.5120.3.1, http://zenodo.org/record/638938
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