177,550 research outputs found
Coincidence Doppler Broadening to Study the Chemical Environment at Positron Annihilation Sites
No full textThis paper introduces a Coincidence Doppler Broadening (CDB) analysis method, as presented during the Alfredo Dupasquier Summer School held in Brunate preceding the 2024 International Workshop on Positron Studies of Defects (PSD-24) in Como. CDB spectroscopy provides quantitative information on the chemical environment surrounding defects in various materials, including metal alloys, oxides, and polymers. Reference materials were analyzed to estimate the average chemical environment around defects, voids and porosities. The methodology is applied not only to homogeneous materials, such as metallic alloys, but also to investigate depth profiles in thin films of various materials. The statistical accuracy of element separation is also examined, along with the necessity to refine the method’s calibration through theoretical calculations and the integration of direct observation techniques
Remembering Alfredo Dupasquier
No full textAlfredo Dupasquier was a member of the "positron community" over a period of some 50 years and made substantial contributions to the science in this community. Here is a brief history of the Alfredo's life related to his scientific and human contribution
Antimatter Research at the CERN Antiproton Decelerator: Legacy of Guido Barbiellini Amidei
No full textThis work reviews the current research directions pursued by collaborations at CERN’s Antiproton Decelerator (AD), with an outlook on future perspectives and challenges in the field. The advancement of precision studies on antimatter builds upon foundational contributions by pioneering researchers, such as Guido Barbiellini Amidei, whose early work on antimatter detection and instrumentation has profoundly influenced the design and methodologies of contemporary experiments at the AD and beyond. This review underscores the lasting impact of these early innovations on ongoing investigations into fundamental symmetries and interactions involving antimatter
Chileseius australis Ferragut, n. sp.
No full textChileseius australis Ferragut n. sp. (Figures 1–10) Diagnosis. Female dorsal shield strongly sclerotised and reticulated. Dorsal setal pattern 11 B: 10 B with presence of seta J 4 and absence of Z 3. Nineteen pairs of thick dorsal setae. Setae S 2 (sometimes), S 4, S 5, J 4, J 5, Z 4 and Z 5 (always) serrated and set on tubercles; the remaining smooth. Seven pairs of dorsal solenostomes. Peritremes extend forward to bases of j 1. Sternal shield with three pairs of setae; posterior margin straight. Ventrianal shield pentagonal, with three pairs of setae and pre-anal pores punctiform and widely separated. Calyx of spermatheca shallow bowl-shaped. Cheliceral fixed digit with seven teeth, movable bidentate. Genu II with seven setae. Three macrosetae on leg IV, being msge and msti similar in length and msta longer. Male ventrianal shield with six pairs of pre-anal setae and pre-anal pores. Spermatodactyl L-shaped with a lateral projection. FEMALE (Figures 1–5) (nine females measured). Dorsal surface. Dorsal shield 435 (400–435) long, 242 (220–249) wide, well sclerotised and delicately reticulated throughout. Nineteen pairs of thick and acute setae, being S 2 (occasionally), S 4, S 5, J 4, J 5, Z 4 and Z 5 serrated. Setae r 3 and R 1 on lateral integument. Setae on the opisthoscutum inserted on tubercles. Seta j 1 26 (25– 29), j 3 22 (22–25), j 4 15 (15–19), j 5 16 (16–18), j 6 18 (18–21), J 2 26 (26–32), J 4 30 (24–32), J 5 16 (16–23), z 2 25 (23–27), z 4 24 (19–26), z 5 18 (18–28), z 6 21 (21–25), Z 1 29 (27–36), Z 4 49 (44–52), Z 5 66 (60–70), s 4 27 (27–31), S 2 40 (37–44), S 4 40 (37–47), S 5 43 (35–47), r 3 27 (25–29), R 1 27 (25–28). Seven pairs of solenostomes (gd 1, gd 2, gd 4, gd 5, gd 6, gd 8, gd 9); gd 1 anterolaterad to j 3, gd 5 posteromediad to z 5, gd 9 anteromediad to S 5, closer to S 5 than to Z 5. Poroids is 1 and idl 2 prominent and located on the margin of dorsal shield. Peritremes fully developed, reaching setae j 1. Ventral surface. Sternal shield quadrate, with three pairs of setae. Distance st 1 –st 3 72 (69–72), distance st 2 –st 2 70 (69–73). Seta st 4 on metasternal platelets. Posterior margin of shield straight. Genital shield 95 (83–97) wide. Ventrianal shield pentagonal, with anterior angles right, 148 (129–148) long, 119 (110–121) wide at level of ZV 2, 119 (109–119) wide at level of preanus (immediately anterior to anus). Surface striated and with two lateral areas of muscle attachments on the posterior margin, at the level of anus. Three pairs of pre-anal setae; pre-anal (gv 3) pores punctiform and widely separated 59 (39–59). Distance between pores gv 3 broader than distance between setae JV 2. Platelets spga elongated and located on the anterior angles of the shield. Four pairs of setae around the shield, JV 5 47 (37–47). A pair of large pores associated with JV 5. Chelicerae. Fixed digit with seven teeth; movable digit with two teeth. Insemination apparatus. Calyx shallow bowl-shaped. Major duct broad, decreasing in thickness toward the atrium. Legs. Genu II with seven setae; chaetotactic formula 2 – 2 /0, 2/ 0–1. Macrosetae on leg IV short, thick and blunt to knobbed. Macrosetae on genu 25 (22–26), tibia 26 (25–27) and basitarsus IV 40 (34–40). MALE (Figures 6–8) (four males measured). Dorsal surface. Dorsal shield 326 (323–330) long, 219 (210–227) wide, weakly reticulated. Twenty-one pairs of thick and blunt setae, S 4, S 5, J 4, Z 4 and Z 5 serrated. Setae on the opisthoscutum inserted on tubercles. Seta j 1 23 (22–24), j 3 20 (20–21), j 4 14 (13–15), j 5 14 (12–15), j 6 16 (16–17), J 2 21 (20–22), J 4 20 (19–22), J 5 15 (14–16), z 2 19 (17–21), z 4 20 (19–20), z 5 15 (14–15), z 6 15 (14–17), Z 1 22 (20–24), Z 4 35 (34–37), Z 5 46 (45–47), s 4 23 (21–25), S 2 29 (27–32), S 4 30 (29–30), S 5 29 (27–30), r 3 21 (20–22), R 1 20 (18–22). Seven pairs of solenostomes. Peritremes extend to bases of setae j 1 or between j 1 and j 3. Ventral surface. Ventrianal shield striated, 137 (135–138) long, 188 (185–194) wide, with six pairs of pre-anal setae; pre-anal pores punctiform and widely separated. Chelicerae. Fixed digit with three teeth; movable digit unidentate. Spermatodactyl L-shaped with a lateral projection. Legs. One macroseta on basitarsus IV 31 (30–31). Macrosetae on genu and tibia IV undifferentiated. DEUTONYMPH (Figures 9–10) (five deutonymphs measured). Dorsal shield weakly sclerotised, with lateral incisions at level of R 1. 346 (332–357) long, 162 (154–168) wide at level of setae z 4. Nineteen pairs of setae as in female, S 2, S 4, S 5, Z 4, Z 5, J 4 and J 5 serrated. Seta j 1 24 (22–24), j 3 23 (22–23), j 4 14 (13–15), j 5 14 (13–15), j 6 18 (16–19), J 2 23 (20–24), J 4 27 (25–28), J 5 18 (16–18), z 2 19 (17– 20), z 4 19 (19–20), z 5 12 (11–12), z 6 18 (17–20), Z 1 22 (20–24), Z 4 42 (39–44), Z 5 44 (42–47), s 4 25 (24–25), S 2 31 (29–32), S 4 32 (30–35), S 5 42 (39–44), r 3 22 (20–22), R 1 21 (20–22), JV 5 24 (22–25). Seven pairs of dorsal solenostomes, distance between ventral solenostomes gv 3 34 (31–36). Lateral cuticle with two setae, r 3 and R 1. Peritreme shorter than in females, reaching seta z 2. Two distinct macrosetae on genu IV 28 (27–29) and tarsus IV 32 (30–35); macroseta on tibia IV not differentiated. Type material. One female holotype, eight female paratypes, four male paratypes and five deutonymph paratypes on Tepualia stipularis (Hooker et Arnott) Griseb. (Mirtaceae). Near Ushuaia (Argentina); 54 º 50 ' 51 " S, 68 º 29 ' 19 " W; 18 m asl. 10 January 2013. Holotype and some paratypes were deposited at Museo Nacional de Ciencias Naturales, Madrid, Spain (MNCN). Reference number of holotype: MNCN 20.02 / 17377; 1 paratype female MNCN 20.02 / 17378. Etymology. The specific name australis means "southern" or "austral" and refers to the occurrence of the species in the southernmost part of the Earth with arboreal vegetation. Comments. Chileseius belongs to the tribe Neoseiulini and is the unique genus in the family Phytoseiidae containing three species with three different idiosomal setal patterns: Ch. camposi 11 B: 11 A/JV– 3:ZV with 36 pairs of setae, Ch. australis sp. nov. 11 B: 10 C/JV 3:ZV, with 35 pairs of setae and Ch. paracamposi 11 B: 9 B/JV 3:ZV, with 34 pairs of setae. Table 1 summarizes the main morphological features to distinguish species within the genus Chileseius. The new species appears to be most closely related to Ch. camposi on the basis of sharing the presence of J 4, a similar spermathecal apparatus, ratio Z 4 / Z 5 and wide distance between pores gv 3.Published as part of Ferragut, Francisco & Navia, Denise, 2015, Phytoseiid mites (Acari: Phytoseiidae) from Patagonia and Tierra del Fuego, pp. 525-550 in Zootaxa 3990 (4) on pages 527-530, DOI: 10.11646/zootaxa.3990.4.3, http://zenodo.org/record/24068
Amblyseius grandiporus Ferragut, n. sp.
No full textAmblyseius grandiporus Ferragut n. sp. (Figures 31–38) Diagnosis. Adult females can be recognised by the hypertrophied pre-anal pores. Dorsal shield smooth, with seventeen pairs of setae, Z 4 and Z 5 lightly serrated. Seta j 3 longer than j 1. Dorsal setal pattern 10 A: 9 B. Seven pairs of dorsal solenostomes. Peritremes extend to j 1. Sternal shield with three pairs of setae, posterior margin concave. Ventrianal shield smooth and vase-shaped. Three pairs of pre-anal setae and a pair of crescentic and hypertrophied pre-anal pores. Calyx of spermatheca saccular. Fixed digit of chelicera with two apical teeth and 15 small denticles; movable three–toothed. Genu II with seven setae. Three macrosetae on leg IV; msge and msta similar in length and longer than msti. Male ventrianal shield anteriorly convex, with four pre-anal setae. Spermatodactyl L-shaped. FEMALE (Figures 31–35) (ten females measured) Dorsal surface. Dorsal shield smooth throughout, 380 (370–390) long, 232 (212–242) wide. Seventeen pairs of smooth and acute setae, being Z 4 and Z 5 lightly serrated. Seta j 1 28 (23–28), j 3 35 (31–35), j 4 6 (5–7), j 5 4 (4– 6), j 6 6 (6–7), J 2 9 (7–9), J 5 8 (7–8), z 2 12 (8–12), z 4 13 (10–15), z 5 5 (4–6), Z 1 11 (7–11), Z 4 65 (56–65), Z 5 113 (97–113), s 4 53 (44–53), S 2 11 (10–13), S 4 10 (9–11), S 5 7 (7–10). Seven pairs of solenostomes; gd 2 mediad and close to z 4, gd 9 anteromediad and close to S 5. Seta r 3 15 (14–18), R 1 10 (10–13). Peritremes reaching setae j 1. Ventral surface. Sternal shield smooth quadrate, with three pairs of setae. Distance st 1 –st 3 66 (65–70), distance st 2 –st 2 73 (67–75). Seta st 4 on metasternal platelets. Posterior margin of shield concave. Genital shield 78 (75–90) wide. Ventrianal shield vase-shaped, straight anteriorly, concave in the laterals; 128 (121–129) long, 87 (83–91) wide at level of ZV2, 95 (91–99) wide at level of anus. Smooth surface. Three pairs of pre-anal setae; pre-anal pores crescentic, hypertrophied and located behind and very close to setae JV 2, separated 35 (32–37). Four pairs of setae surrounding the shield, JV 5 smooth 48 (40–50). Chelicerae. Fixed digit multidentate, with two strong apical teeth and 15 small and acute denticles; movable digit with three teeth. Insemination apparatus. Calyx saccular 11 (11–13) long. Atrium C-shaped and globular. Legs. Genu II with seven setae; 2 – 2 /0, 2/ 0–1. Macroseta on genu I not very distinctive from other setae in the segment, 24 (24–26), macroseta on genu II 28 (26–31), genu III 29 (26–31), genu IV 57 (51–58), tibia IV 43 (35– 44), basitarsus IV 53 (50–56). MALE (Figures 36–38), (one male measured). Dorsal surface. Smooth dorsal shield, 300 long, 204 wide. Nineteen pairs of setae, Z 4 and Z 5 serrated. Seta j 1 22, j 3 29 (20–21), j 4 and j 5 7, j 6 8, J 2 9, J 5 7, z 2 11, z 4 13, z 5 5, Z 1 8, Z 4 46, Z 5 82, s 4 40, S 2 13, S 4 8, S 5 10, r 3 13, R 1 11. Seven pairs of dorsal solenostomes, arranged as in females. Peritremes extending between setae j 1 and j 3. Ventral surface. Ventrianal shield subtriangular in shape and smooth, 138 long, 166 wide at level of anterior corners. Anterior margin strongly convex and fused with endopodals, laterals slightly concave. Four pairs of preanal setae. Pre-anal pores crescentic and hypertrophied, 26 apart. Distance between pores broader than distance between setae JV 2. Four pairs of poroids. Seta JV 5 32. Chelicerae. Interior margin of digits not discernible, fixed digit multidentate. Spermatodactyl L-shaped. Legs. Macrosetae on genu I 23, genu II 26, genu III 22, genu IV 40, tibia IV 34, tarsus IV 46. Type material. One female holotype and nine female paratypes on Eucryphia cordifolia; two female paratypes and one male paratype on Chusquea sp.; one female paratype on Saxegothaea conspicua. Tinquilco Lake near Pucón (Chile); 39 º 10 '09" S, 71 º 43 ' 33 " W; 814 m asl; 6 January 2013. Holotype and some paratypes were deposited at Museo Nacional de Ciencias Naturales, Madrid, Spain (MNCN). Reference number of holotype: MNCN 20.02 / 17389; 2 male paratypes MNCN 20.02 / 17390. Etymology. The name grandiporus is a compound of Latin grandis "large" and porus "pores", referring to the hypertrophied pre-anal pores in this species. Comments. This species belongs to the nicola subgroup of the obtusus species group (Chant & McMurtry, 2004) and is similar to Amblyseius franzellus Athias-Henriot, A. aricae Karg and A. intermedius González & Schuster, all of them described from Chile and Argentina. The new species is easily distinguished by the hypertrophied pre-anal pores. In addition, A. franzellus has six–seven denticles on cheliceral fixed digit and six pairs of dorsal solenostomes; A. aricae has longer dorsal setae, especially s 4 (90 v. 48), Z 4 and Z 5 (110, 180 v. 60, 110) and noticeable longer macrosetae on leg IV; A. intermedius differs by having longer s 4, Z 4 and Z 5 (72, 90, 160, respectively), eight teeth on fixed digit of chelicera and the male has five instead of four pre-anal setae.Published as part of Ferragut, Francisco & Navia, Denise, 2015, Phytoseiid mites (Acari: Phytoseiidae) from Patagonia and Tierra del Fuego, pp. 525-550 in Zootaxa 3990 (4) on pages 538-540, DOI: 10.11646/zootaxa.3990.4.3, http://zenodo.org/record/24068
Typhlodromips fissuratus Ferragut, n. sp.
No full textTyphlodromips fissuratus Ferragut n. sp. (Figures 26–30) Diagnosis. Female dorsal shield mostly smooth, with striae on the lateral margins and weak polygonal cells between setae j 6 and Z 4. Dorsal setal pattern 10 A: 9 B. Seventeen pairs of dorsal setae, Z 4 and Z 5 serrated. Seven pairs of dorsal solenostomes. Peritremes broad and extending to j 1. Sternal shield with three pairs of setae, posterior margin straight or slightly concave. Ventrianal shield vase-shaped, with three pairs of pre-anal setae and pores gv 3 punctiform. Calyx of spermatheca saccular; atrium fissured at the junction with major duct. Genu II with seven setae. Three short macrosetae on leg IV. FEMALE (Figures 26–30) (three females measured). Dorsal surface. Central area of dorsal shield mostly smooth, striate in the margins, delicately reticulated between j 6 and Z 4, posterior region behind Z 4 smooth. Length 430 (410–432), width 240 (228–240). Seventeen pairs of smooth setae, except Z 4 and Z 5 which are serrated. Seta j 1 30 (27–30), j 3 33 (27–33), j 4 17 (14–18), j 5 16 (14–16), j 6 20 (18–20), J 2 24 (23–24), J 5 11 (11–14), z 2 24 (20–25), z 4 23 (23–25), z 5 15 (14–18), Z 1 27 (24–27), Z 4 48 (42–48), Z 5 68 (60–68), s 4 39 (36–39), S 2 28 (27–30), S 4 21 (17–23), S 5 21 (17–21), r 3 27 (18–27), R 1 22 (18–22). Seven pairs of solenostomes; gd 1 between j 3 –z 2, gd 2 mediad and close to z 4, gd 5 posteromediad to z 5, gd 9 anteromediad and close to S 5. Peritremes broad, extending to setae j 1. Ventral surface. Sternal shield wider than long, distance st 1 – st 3 70 (68–70), distance st 2 –st 2 75 (75–78). Surface smooth, posterior margin lightly concave, with three pairs of setae. Seta st 4 on metasternal platelets. Genital shield 79 (79–82) wide. Ventrianal shield vase-shaped, with anterior margin straight and laterals concave; 126 (126–130) long, 103 (94–103) wide at level of ZV2, 86 (84–88) wide at level of concavity. Surface striated; two lateral areas of muscle marcs on the posterior margin, at the level of anus. Three pairs of pre-anal setae; preanal (gv 3) pores punctiform, distance between them 20 (20–21). Distance between pores gv 3 narrower than distance between setae JV 2. Four pairs of setae around the shield, JV 5 37 (35–41). A pair of large pores associated with JV 5. Chelicerae. Fixed digit with seven teeth (two strong apical teeth plus five denticles), movable digit with three well separated teeth. Insemination apparatus. Calyx saccular, 18 (17–18) long. Atrium C-shaped, major duct broad. At the junction with the duct the atrium is distinctly fissured. Legs. Genu II with seven setae; 2 – 2 /0, 2/ 0–1. Macrosetae on genu I and genu II scarcely differentiated, on genu III 23 (22–23). Three short, stout and blunt macrosetae on leg IV, macroseta on genu IV 37 (32–37), tibia IV 27 (24–28) and basitarsus IV 33 (32–33). MALE. Unknown. Type material. Holotype female and one female paratype on Rubus sp. (Rosaceae), Tinquilco Lake near Pucón (Chile); 39 º 10 '09" S, 71 º 43 ' 33 " W; 814 m asl (above sea level); 6 January 2013; one female paratype on Nothofagus dombeyi, Puerto Blest, Bariloche (Argentina), near the Argentinean–Chilean border; 41 º 01' 10 " S, 71 º 09' 35 " W; 837 m asl. 3 January 2013. Holotype and one paratype were deposited at Museo Nacional de Ciencias Naturales, Madrid, Spain (MNCN). Reference number of holotype: MNCN 20.02 / 17388. Etymology. The Latin name fissuratus derives from fissura "cleft" and refers to the junction between the major duct and the atrium in the spermatheca, an unusual character within the genus Typhlodromips. Comments. The habitus of this species resembles of that T. valdiviensis. It can be differentiated by the female insemination apparatus, with a fissured or vacuolated atrium in T. fissuratus; by the relative length of setae j 1 –j 3, being similar in T. fissuratus (j 1 27–30; j 3 27–33) and j 3 much longer in T. valdivianus (j 1 32–34; j 3 42–44) and by the length of macrosetae on leg IV, shorter in T. fissuratus (msgeIV 32–37; mstiIV 24–28; mstaIV 32–33) than in T. valvidianus (msgeIV 48–53; mstiIV 45–48; mstaIV 47–51). In addition, the female dorsal surface shows striated and faintly reticulated areas in T. fissuratus while in T. valdivianus is completely smooth. Typhlodromips fissuratus also differs from T. fordycei by its saccular rather than funnel-shaped calyx with a bulbous atrium. Typhlodromips compressus has the genital shield as wide as the ventrianal and only one macrosetae on leg IV instead of ventrianal wider than genital and three macrosetae on leg IV in the case of T. fissuratus.Published as part of Ferragut, Francisco & Navia, Denise, 2015, Phytoseiid mites (Acari: Phytoseiidae) from Patagonia and Tierra del Fuego, pp. 525-550 in Zootaxa 3990 (4) on page 536, DOI: 10.11646/zootaxa.3990.4.3, http://zenodo.org/record/24068
Typhlodromips valdivianus Ferragut, n. sp.
No full textTyphlodromips valdivianus Ferragut n. sp. (Figures 19–25) Diagnosis. Female dorsal shield evenly smooth, with seventeen pairs of setae, only Z 5 lightly serrated. Dorsal setal pattern 10 A: 9 B. Seven pairs of dorsal solenostomes. Peritremes reaching j 1. Sternal shield with three pairs of setae, posterior margin straight or concave. Ventrianal shield vase-shaped, with three pairs of pre-anal setae and pores gv 3 crescentic. Calyx of spermatheca saccular. Chelicerae not well visible; apparently, fixed digit with seven teeth, movable digit three-toothed. Genu II with seven setae. Three macrosetae on leg IV similar in length. Male ventrianal shield anteriorly lobate, with four pairs of pre-anal setae and crescentic pores gv 3. Spermatodactyl Lshaped. FEMALE (Figures 19–22) (five females measured) Dorsal surface. Dorsal shield completely smooth, 425 (416–425) long, 240 (235–250) wide. Seventeen pairs of smooth and acute setae, being Z 4 and Z 5 lightly serrated. Seta j 1 32 (32–34), j 3 43 (42–44), j 4 16 (12–16), j 5 12 (12–13), j 6 17 (16–17), J 2 20 (18–20), J 5 12 (12–13), z 2 23 (19–23), z 4 22 (17–22), z 5 12 (10–12), Z 1 20 (19–20), Z 4 46 (45–48), Z 5 65 (65–68), s 4 42 (42–47), S 2 20 (19–20), S 4 17 (16–19), S 5 15 (14–16), r 3 23 (20–23), R 1 20 (19–23). Seven pairs of punctiform solenostomes; gd 1 posteolateral to j 3, between j 3 and z 2, distance gd 1 –j 3 17; gd 2 medial to z 4, distance gd 2 –z 4 16–17; gd 9 anteromedial to S 5, distance gd 9 – S 5 12–16. Peritremes broad and fully developed, reaching setae j 1. Ventral surface. Sternal shield wider than long, with three pairs of setae. Distance st 1 –st 3 77 (73–77), distance st 2 –st 2 82 (80–83). Seta st 4 on metasternal platelets. Surface of shield smooth and posterior margin straight to concave. Genital shield 77 (77–85) wide. Ventrianal shield vase-shaped, longer than wide, with anterior margin straight and laterals concave, 135 (134–140) long, 90 (90–103) wide at level of ZV2, 82 (82–89) at level of concavity. Surface smooth and with two lateral areas of muscle attachments on the posterior margin, at the level of anus. Three pairs of pre-anal setae; pre-anal (gv 3) pores crescentic, distance between them 19 (19–22). Four pairs of setae around the shield, JV 5 smooth 45 (45–46). Chelicerae. Chelicerae not clearly discernible on the examined specimens. Apparently, fixed digit with seven teeth, movable digit with three teeth. Insemination apparatus. Calyx saccular, 18 long. Atrium C-shaped, major duct broad. Legs. Genu II with seven setae; 2 2 /0 2 /0 1. Macroseta on genu I 27 (27–28), genu II 25 (24–28), genu III 31 (31–33). Leg IV with three long and blunt macrosetae, proximal part stout, distal part thin. Macroseta on genu IV 48 (48–53), tibia IV 48 (45–48) and basitarsus IV 51 (47–51). MALE (Figures 23–25) (two males measured). Dorsal surface. Dorsal shield smooth and well sclerotised, 338 (330–345) long, 195 (190–200) wide. Nineteen pairs of smooth and acute setae. Seta j 1 29 (28–29), j 3 39 (38–40), j 4 13, j 5 12 (11–13), j 6 15 (14–15), J 2 20 (19– 20), J 5 10, z 2 18 (17–19), z 4 17 (16–18), z 5 10 (9–10), Z 1 18 (17–18), Z 4 39 (37–40), Z 5 57 (56–58), s 4 35 (34– 36), S 2 17, S 4 16 (15–16), S 5 16 (15–16), r 3 20 (19–20), R 1 16 (15–16). Seven pairs of punctiform solenostomes. Peritremes ending between setae j 1 –j 3. Ventral surface. Ventrianal shield subtriangular, with anterior margin striated and lobate, 158 (154–162) long, 182 (174–190) wide. Four pairs of pre-anal setae; pre-anal (gv 3) pores crescentic and close each other. Distance between pores gv3, 20 (19–21), shorter than distance between setae JV 2. Seta JV 5 33 (32–34). Chelicerae. Fixed digit with six small teeth; movable digit with a strong tooth. Spermatodactyl L-shaped, with an acute lateral projection. Legs. Macrosetae on genu I 28, genu II 25 (24–26), genu III 24 (23–25), genu IV 39, tibia IV 36 (35–37) and basitarsus IV 39 (38–39). Type material. Holotype female, two female paratypes and one male paratype on Saxegothaea conspicua Puerto Blest, Bariloche (Argentina), near the Argentina-Chile border; 41 º 01' 10 " S, 71 º 09' 35 " W; 837 m asl. 3 January 2013; two females and one male paratypes on Nothofagus dombeyi, Tinquilco Lake near Pucón (Chile); 39 º 10 '09" S, 71 º 43 ' 33 " W; 814 m asl (above sea level); 6 January 2013. Holotype and some paratypes were deposited at Museo Nacional de Ciencias Naturales, Madrid, Spain (MNCN). Reference number of holotype: MNCN 20.02 / 17385; 1 female paratype MNCN 20.02 / 17386; 1 male paratype MNCN 20.02 / 17387. Etymology. The species name valdivianus derives from the evergreen Valdivian rain forests in which the mites were collected. Comments. This species belongs to the ariri species group (Chant & McMurtry, 2005) in which a few taxa have ventrianal shield vase-shaped, seven setae on genu II and three macrosetae on leg IV. Typhlodromips hamiltoni Chant & Yoshida-Shaul differs by having a cup-shaped spermatheca, macroseta on tibia IV shorter than macrosetae on genu and tarsus IV and only five pairs of dorsal solenostomes. Furthermore, setae Z 4 and Z 5 are, respectively, 60 and 113 long in T. hamiltoni and 44 and 65 in T. valdivianus. Typhlodromips robusticalyx Moraes, Zannou & Oliveira and T. sinensis Denmark & Muma have funnel-shaped calyx and ten denticles on fixed digit in the chelicera, instead of saccular calyx and seven teeth. Typhlodromips fordycei (De Leon) and T. compressus (Wu & Li) also resemble the new species. Both species have dorsal shield striated to reticulated instead of smooth and two and one macrosetae on leg IV, respectively, instead of three longer macrosetae in T. valdivianus.Published as part of Ferragut, Francisco & Navia, Denise, 2015, Phytoseiid mites (Acari: Phytoseiidae) from Patagonia and Tierra del Fuego, pp. 525-550 in Zootaxa 3990 (4) on pages 533-535, DOI: 10.11646/zootaxa.3990.4.3, http://zenodo.org/record/24068
Neoseiulus mapuche Ferragut, n. sp.
No full textNeoseiulus mapuche Ferragut n. sp. (Figures 11–18) Diagnosis. Distinctive features are: female dorsal shield mostly smooth, only striated and lightly reticulated on anterolateral margins and opisthosoma; dorsal setae on podoscutum relatively short; wide ventrianal shield, as wide as or wider at level of anus than at level of seta ZV 2. Dorsal setal pattern 10 A: 9 B. Seventeen pairs of short and smooth setae; setae S 4, S 5, Z 4, Z 5 and J 5 serrated. Seven pairs of dorsal solenostomes. Peritremes extend to j 1. Sternal shield with three pairs of setae; posterior margin straight. Ventrianal shield pentagonal, with three pairs of short setae and crescentic pores. Calyx of spermatheca saccular. Fixed digit of chelicera with five to seven teeth, movable unidentate. Genu II with seven setae. One macroseta on tarsus IV. Male ventrianal shield with four pairs of setae and pre-anal pores crescentic and close to each other. FEMALE (Figures 11–15) (eleven females measured). Dorsal surface. Dorsal shield 415 (408–435) long, 225 (216–234) wide. Anterolateral margins striated to reticulated, rounded cells between setae j 5, z 5 and j 6, opisthosoma striated to weakly reticulate. Seventeen pairs of short, sharp and smooth setae, except for S 4, S 5, Z 4, Z 5 and J 5 which are thick and serrated. Setae S 4, S 5 and Z 5 set on tubercles. Seta j 1 23 (19–33), j 3 17 (16–21), j 4 11 (11–18), j 5 12 (11–14), j 6 13 (11–14), J 2 15 (14–16), J 5 14 (12–16), z 2 16 (12–17), z 4 17 (15–18), z 5 11 (11–15), Z 1 15 (13–19), Z 4 28 (24–29), Z 5 60 (52–62), s 4 22 (21–25), S 2 22 (20–26), S 4 27 (25–32), S 5 28 (25–32), r 3 21 (20–23), R 1 17 (17–24). Seven pairs of punctiform dorsal solenostomes; gd 1 lateral to j 3, gd 8 anterolateral to Z 4, gd 9 posteromedial to S 5. Distance gd 8 –Z 4 30, distance gd 9 – S 5 15. Poroid idl 2 prominent and located on the margin of dorsal shield, idl 3 widely spaced from the margin. Peritremes broad and fully developed, reaching setae j 1. Ventral surface. Sternal shield longer than wide, with three pairs of setae. Distance st 1 –st 3 72 (72–81), distance st 2 –st 2 67 (66–70). Seta st 4 on metasternal platelets. Posterior margin of shield straight. Genital shield 84 (82–92) wide. Ventrianal shield pentagonal and lightly striated, with anterior angles rounded, 139 (135–147) long, 111 (105–121) wide at level of ZV 2, 118 (113–121) wide at level of preanus. Three pairs of pre-anal setae very short (9–10 µm long); pre-anal (gv 3) pores crescentic, close each other 19 (16–22) and posteromediad to JV 2. Lateral margins of the shield with two large muscle attachment areas at level of anus. Platelets spga elongated and located on the anterior angles of the shield. Four pairs of setae and four of poroids surrounding the shield, JV 5 33 (33–40). Chelicerae. Fixed digit with five to seven teeth; movable digit unidentate. Insemination apparatus. Calyx saccular 14 long, atrium C-shaped, major duct broad. Legs. Genu II with seven setae; 2 – 2 /0, 2/ 0–1. Leg IV with one macroseta on basitarsus 37 (32–37) long; macrosetae on genu and tibia IV indistinguishable. MALE (Figures 16–18) (five males measured). Dorsal surface. Dorsal shield 342 (338–350) long, 214 (208–220) wide, distinctly reticulated. Nineteen pairs of thick and acute setae, being Z 4 and Z 5 serrated. Seta j 1 18 (15–20), j 3 16 (14–17), j 4 11 (10–13), j 5 11 (10–11), j 6 12 (11–12), J 2 14 (12–15), J 5 13 (12–14), z 2 15 (14–16), z 4 15 (12–17), z 5 11 (10–11), Z 1 13 (11–14), Z 4 22 (21–22), Z 5 37 (35–42), s 4 19 (18–20), S 2 18 (16–19), S 4 24 (23–24), S 5 24 (22–25), r 3 19 (17–21), R 1 18 (16– 18). Seven pairs of dorsal solenostomes. Peritremes extend to bases of setae j 1. Ventral surface. Ventrianal shield 143 (140–148) long, 178 (166–190) wide. Surface striated with polygonal cells around anal opening. Anterior margin strongly convex. Two large lateral areas of muscle attachments on the posterior margin. Four pairs of pre-anal setae and four pairs of poroids. Pre-anal (gv 3) pores crescentic and near each other. Distance between pores shorter than distance between setae JV 2. Chelicerae. Fixed digit with two strong teeth and three to five small denticles, movable digit with one tooth. Spermatodactyl L-shaped with an acute lateral projection. Legs. Macroseta on leg IV short, blunt and curved, 29 (25–32) long. Type material. Holotype female, ten female paratypes and six male paratypes on Saxegothaea conspicua Lindl. (Podocarpaceae). Puerto Blest, Bariloche (Argentina), near the Argentina-Chile border; 41 º 01' 10 " S, 71 º 09' 35 " W; 837 m asl. 3 January 2013. Holotype and some paratypes were deposited at Museo Nacional de Ciencias Naturales, Madrid, Spain (MNCN). Reference number of holotype: MNCN 20.02 / 17379; 3 female paratypes (MNCN 20.02 / 17380, MNCN 20.02 / 17381, MNCN 20.02 / 17382); 2 male paratypes (MNCN 20.02 / 17383, MNCN 20.02 / 17384). Etymology. The term mapuche refers to the original inhabitants of the territories in south-central Chile and southwestern Argentina, the most numerous group of Indians in South America. Comments. This species belongs to the cucumeris subgroup in the cucumeris species group according to Chant & McMurtry (2003). Only four species in the subgroup have calyx bell or cup-shaped, seven setae on genu II and seven pairs of dorsal solenostomes. Neoseiulus mapuche can be differentiated from N. arenarius Denmark & Edland and N. communis Denmark & Edland by having the dorsal shield mostly smooth, five to seven teeth in the cheliceral fixed digit and only one macroseta on tarsus IV. It differs from N. koyamanus Ehara & Yokogawa by having only one tooth on movable digit of chelicera. Finally, N. umbraticus (Chant) has three macrosetae on leg IV, peritreme to j 3 and the male six pairs of pre-anal setae. The wide ventrianal shield and short dorsal setae closely resembles this species with N. camarus (El-Badry), N. ellesmerei (Chant & Hansell), N. inabanus (Ehara) and N. paraibensis (Moraes & McMurtry). Neoseiulus camarus and N. ellesmerei differ from the new species by having a bell-shaped calyx with a distinct neck between calyx and atrium. Neoseiulus inabanus and N. paraibensis have the dorsal shield evenly or partially reticulated instead of mostly smooth and they have, respectively, two and three medium to long macrosetae on leg IV, instead of one short macroseta. In addition, the calyx in the spermatheca is different, being short cup or bell-shaped in N. paraibensis and N. inabanus, respectively, and saccular in N. mapuche.Published as part of Ferragut, Francisco & Navia, Denise, 2015, Phytoseiid mites (Acari: Phytoseiidae) from Patagonia and Tierra del Fuego, pp. 525-550 in Zootaxa 3990 (4) on pages 530-533, DOI: 10.11646/zootaxa.3990.4.3, http://zenodo.org/record/24068
On the complete integrability of the Raychaudhuri differential system in R^4 and of a CRNT model in R^5
No full textAgraïments: A. Ferragut is partially supported by the Universitat Jaume I Grant P1-1B2015-16. C.Valls is supported by Portuguese National Funds through FCT - Fundação para a Ciência e a Tecnologia within the Project PTDC/MAT/117106/2010 and by CAMGSD.WestudytheDarbouxintegrabilityoftwodifferentialsystemswithparam- eters: the Raychaudhuri equation (a relativistic model in R4) and a chemical reaction model in R5. We prove that the first one is completely integrable and that the first inte- grals are of Darboux type. This is the first four-dimensional realistic non-trivial model which is completely integrable with first integrals of Darboux type and for which for a full Lebesgue measure set of the values of the parameters the three linearly indepen- dent first integrals are rational. For the second one, we find all its Darboux polynomials and exponential factors and we prove that it is not Darboux integrable
First report of Raoiella indica (Acari: Tenuipalpidae) in Colombia
No full text[EN] In January 2010, high populations of Raoiella
indica were reported for the first time in Colombia
attacking coconut, banana, and heliconia
plants in the Tayrona National Park. The predatory
mite, Amblyseius largoensis, was found associated
with R. indica in Los Naranjos,
Magdalena. Strict sanitary strategies and other
management tactics should be implemented to
minimize the damage caused by R. indica in the
AmericasCarrillo, D.; Navia, D.; Ferragut Pérez, FJ.; Peña, J. (2011). First report of Raoiella indica (Acari: Tenuipalpidae) in Colombia. Florida Entomologist. 94(2):370-371. doi:10.1653/024.094.0241S37037194
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