1,354,441 research outputs found
Aonidella Maciolek
No full textGenus Aonidella Maciolek in López-Jamar, 1989 Aonidella Maciolek in López-Jamar, 1989: 107 –110. Type species: Prionospio cirrobranchiata Day, 1961, designated by Maciolek, 1983. Aonidella cirrobranchiata (Day, 1961) Prionospio cirrobranchiata Day, 1961: 488, fig. 4 a–d. — Ibarzabal, 1986: 13. Minuspio cirrobranchiata. — Foster, 1971 a: 108. Prionospio (Minuspio) cf. cirrobranchiata.— Johnson, 1984: 6.58–6.59, figs 6.47–6.48. Aonidella cirrobranchiata. — Maciolek, 2000: 530 –531, fig. 1. Type locality. Cape Coast, South Africa (34 ° 11´S, 18 ° 13´E), 144 m, sandy mud; paratypes, South-West Africa (34 º 17´S, 17 º 53´E), 320 m, black and green sand and mud. Type material. Holotype not located, paratypes (BMNH ZK 1961.9.480/ 1). Records. USA: off Florida and Texas, 15–90 m, coarse to fine sand (Johnson, 1984). Cuba: Batabano (Ibarzabal 1986). Remarks. The presence of Aonidella cirrobranchiata (Day, 1961) in the Grand Caribbean is questionable. Specimens of Johnson (1984) and Ibarzabal (1986) require examination, because these specimens differ from A. cirrobranchiata (Day, 1961), in having a slight medial indentation on the prostomium, four eyes instead of none, and hooded hooks with 2–4 apical teeth instead of one.Published as part of Delgado-Blas, Victor Hugo & Salazar-Silva, Patricia, 2011, Taxonomic catalogue of the Spionidae (Annelida: Polychaeta) of the Grand Caribbean, pp. 39-66 in Zootaxa 2782 on pages 40-41, DOI: 10.5281/zenodo.20683
Parameters of State in the Global Thermodynamics of Binary Ideal Gas Mixtures in a Stationary Heat Flow
No full textDane do rysunku 1 z powiazanej publikacji</p
Critical Casimir effect in superfluid wetting films
No full textRecent experimental data for the complete wetting behavior of pure He-4 and of He-3-He-4 mixtures exposed to solid substrates show that there is a change of the corresponding film thicknesses L upon approaching thermodynamically the lambda transition and the tricritical end point, respectively, which can be attributed to critical Casimir forces f(C). We calculate the scaling functions Theta of f(C) within models representing the corresponding universality classes. For the mixtures our analysis provides an understanding of the rich behavior of Theta deduced from the experimental data and predicts the crossover behavior between the tricritical point and the lambda transition of pure He-4 which are connected by a line of critical points. The formation of a "soft-mode" phase within the wetting films gives rise to a pronounced maximum of f(C) below the tricritical point as observed experimentally. Near the tricritical point we find logarithmic corrections similar to L-3(ln L)(1/2) for the leading behavior of Theta dominating the contributions from the background dispersion forces
Minuspio lighti Maciolek 1985
No full textMinuspio lighti Maciolek, 1985 Prionospio (Minuspio) lighti Maciolek, 1985: 363, figs 14 A–E; Granados-Barba & Solís-Weiss, 1998: 115. Type locality. Bainbridge Island, Washington, USA (47 º 40´N, 122 º 30´W). Type material. Holotype (USNM 74740), paratypes (USNM 7474). Records. Mexico: Tabasco, Campeche and Yucatan (Granados-Barba & Solís-Weiss 1998). Remarks. The identity of the records from the Grand Caribbean need to be confirmed against the type material.Published as part of Delgado-Blas, Victor Hugo & Salazar-Silva, Patricia, 2011, Taxonomic catalogue of the Spionidae (Annelida: Polychaeta) of the Grand Caribbean, pp. 39-66 in Zootaxa 2782 on page 49, DOI: 10.5281/zenodo.20683
Anguillosyllis andeepia Maciolek 2020, n. sp.
No full textAnguillosyllis andeepia n. sp. Figures 20–21 urn:lsid:zoobank.org:act: BA33786A-A665-40C1-AE6E-1CBA34BEB6FA Material examined. South Atlantic Ocean, abyssal plain, South of Meteor Rise (1 specimen from 1 station) Coll. S. Doner ANDEEP III, Sta. PS 67/21-3, 29 Jan 2005, 47°40.05′S, 4°14.84′E, large box corer, 4551 m, holotype (SMF 24863). Description. Body with 8 setigers (Figs. 20A, 21A), colorless; holotype slightly longer than 1 mm without anal cirri, 0.2 mm wide without parapodia, 0.5 mm wide with parapodia but excluding setae; posterior appearing somewhat wide and flat due to distortion by eggs. Palps elongated, completely fused, narrowing to softly pointed anterior margin, with faint internal indication of median furrow; prostomium dome-shaped, not well demarcated from palps, with three antennae in transverse row; eyes lacking; peristomium 0.6 mm long, 1.5 times longer than prostomium (Figs. 20A, C; 21A), with two short oval tentacular cirri. No nuchal cilia visible even when specimen stained with Shirlastain A. Proventricle in two setigers, bluntly barrel-shaped anteriorly, slightly tapered posteriorly, rows of muscle cells indistinct (Figs. 20A, 21A). Parapodia uniramous, shortest on setiger 1, becoming longer, rectangular over next few setigers; very small anterior lobe present on all setigers; posterior lobe smallest on setiger 1, becoming much larger through setiger 7, then slightly smaller on setiger 8 (Figs. 20B, 21B); dorsal lobe rounded; parapodia without internal glands. Dorsal cirri lost, basal cirrophores present on setigers 1, 3–8; ventral cirri short, digitiform, inserted in middle of parapodium. All setae compound with heterogomph shafts; setiger 1 with 18–20 setae, setiger 2 with 20–22 setae, remaining setigers with similar numbers, fewer setae in setiger 8. Several setae emerging from distal tip of parapodium, others from ventral face of parapodium; ventral-most blades shortest, 25–50 µm, terminating in pointed tips; longer blades 85–110 µm, with long, fine, drawn-out tips; blades possibly with very fine serrations in proximal portion (difficult to see in light microscope even at 1500x). Parapodia each with two thick, bluntly pointed golden aciculae, not protruding but forming anterior and posterior bumps at distal end of parapodia. Pygidial cirri lost. Oocytes in coelom of setigers 5/ 6–8 (Fig. 21A), measuring 65–80 µm greatest diameter; some oocytes entering or within parapodia. Remarks. Anguillosyllis andeepia n. sp. is unique in the proportions of the peristomium, which is 1.5 times the length of the prostomium and much longer than typical Anguillosyllis peristomia; it is also one of only two species encountered in this study that are reproductively mature with eight setigers. The completely fused palps align it with the group of species with similar palps. Of those, four species in addition to A. andeepia n. sp. have large posterior lobes on the parapodia: A. denaria n. sp. from the South China Sea, which has 10 setigers and elongated, slightly rounded palps; A. pupa from the North Atlantic, which has nine setigers and low, rounded palps; an unnamed 9-setiger species from the CCFZ, and A. bruneiensis n. sp. from the South China Sea, which also has eight setigers but has anteriorly rounded palps. In addition to differences in palp structure, all four species have a peristomium that is shorter than the prostomium, in contrast to the deep peristomium of A. andeepia n. sp. Etymology. This species name is based on ANDEEP, the acronym for the expedition to study deep-sea biodiversity in Antarctica. Records. Antarctica, 4551 m.Published as part of Maciolek, Nancy J., 2020, Anguillosyllis (Annelida: Syllidae) from multiple deep-water locations in the northern and southern hemispheres, pp. 1-73 in Zootaxa 4793 (1) on pages 46-47, DOI: 10.11646/zootaxa.4793.1.1, http://zenodo.org/record/389615
Heterospio bidentata Blake & Maciolek 2023, new species
No full textHeterospio bidentata new species Figures 16–17 urn:lsid:zoobank.org:act: F02FC7F2-9427-4C87-B909-EF789C240339 Material examined. Continental slope off Queensland, Eastern Australia, Coral Sea Marine Park, R / V Investigator, Sta. 134, coll. 14 June 2017, Brenke sledge, start 23.750°S, 154.572°E, 2093 m to end 28.774°S, 154.546°E, 2156 m, holotype (AM W.52715). Description. A moderately sized species, holotype (AM W.52715) only available specimen, incomplete, with 14 setigers, 10 mm long, 0.20 mm wide across thoracic setigers. Body long, narrow, threadlike, divided into thoracic region with crowded segments and abdominal region with elongate cylindrical segments; posterior segments missing. Thoracic parapodia weakly swollen, elevated over dorsal and ventral surfaces (Fig. 16A–C); abdominal parapodia reduced; cylindrical, dorsal and ventral surfaces smooth, lacking grooves or ridges. A thin membrane observed on some abdominal setigers suggesting remnants of an adhering tube. Color in alcohol light tan; pigment absent. Pre-setiger region narrow, about as long as first 2.5 setigers (Fig. 16A–C). Prostomium elongate, weakly diamond-shaped, tapering anteriorly to rounded tip, posteriorly extending over peristomium to anterior margin of setiger 1 as a dorsal crest (Fig. 16A–B); eyes absent, nuchal organs not observed. Peristomium with two lateral grooves, producing two rings apparent laterally, but not crossing dorsal and ventral surfaces (Fig. 16A–C); dorsally interrupted by dorsal crest; dorsal tentacles absent, scars not apparent. Ventrally, mouth a semi-circular opening on first peristomial ring, with seven short lobes on anterior lip, none on posterior lip (Fig. 16C). Branchiae present on setigers 2–5 as short stubs or scars dorsal to notosetae (Fig. 16A–B). Thoracic region consisting of six short setigers, each about as wide as long and a seventh setiger about 1.5 times longer than setiger 6 (Fig. 16A–B); setigers 1–7 slightly flattened dorsally with parapodia weakly inflated and elevated over dorsum; similarly inflated ventrally; setiger 8 greatly elongate, as long as first six thoracic segments, setiger 9 equally as long as setiger 8, setigers 8–14 comprising available elongate middle body or abdominal setigers, each about 15 times longer than short thoracic setigers, cylindrical with parapodia reduced, not conspicuous. All parapodia biramous with setal fascicles arising from anterior edge of segments. All thoracic notopodia with 8–12 capillaries; thoracic neuropodia of setiger 1 with five curved bidentate spines (Fig. 16D–E) and 3–4 capillaries; setigers 2–7 with 6–8 capillary noto- and neurosetae. Elongate setiger 8 with capillaries, transitioning to acicular spines in both noto- and neuropodia on setiger 9, setae arranged in short fan-shaped fascicles consisting of two rows of setae with acicular spines in anterior row and capillaries in posterior row; parapodia of setigers 9–13 lateral with noto-and neuropodia close together leaving broad dorsal and ventral gaps, not producing encircling cinctures. Thoracic neuropodial bidentate spines of setiger 1 strongly curved, with thick blunt-tipped main fang on concave side of shaft surmounted by thin apical tooth on convex side (Fig. 16D–E). Abdominal acicular spines with thick, weakly curved shaft tapering to narrow pointed tip (Fig. 16F–H); aristate setae and subuluncini not observed. Far posterior segments and pygidium unknown. Methyl Green staining. Methyl Green imparts a distinctive pattern in which the pre-setiger region and dorsal and ventral surfaces of the thoracic setigers are heavily stained (Fig. 17). The stain is concentrated in numerous large glandular cells that occur in those areas. Remarks. Heterospio bidentata n. sp. is only the fourth species of the genus reported to have curved neuropodial spines in setiger 1 and the second with bidentate hooks. Two species reported with unidentate hooks are H. catalinensis (Hartman, 1944) from southern California in shelf depths (Hartman 1944, 1957) and Heterospio sp. A reported by Uebelacker (1984) from the Gulf of Mexico. Heterospio bidentata n. sp. and H. alata n. sp., both described in the present study, are the first having bidentate hooks in the neuropodia of setiger 1. In H. bidentata n. sp. the apical tooth is a distinct secondary tooth arising directly from the shaft; whereas in H. alata n. sp. the apical “tooth” is an extension of a flange or crest that occurs along the convex side of the shaft and extends over the curved tip or main tooth of the hook providing the bidentate appearance. See earlier remarks for H. alata n. sp. Heterospio bidentata n. sp. is further unusual among species of the genus in having the transition from defined tight setal fascicles to paired rows of setae with spines occurring on setiger 9. In most species, this transition occurs on setiger 10; in the other species with bidentate hooks, H. alata n. sp., the transition occurs at setiger 11. In addition, the rows of spines and capillaries on setigers 9–13 of H. bidentata n. sp. are short and limited to the lateral sides of individual segments, leaving wide dorsal and ventral gaps instead of producing the encircling cinctures that characterize most species of the genus. Etymology. The epithet is from bidens, Latin for two-toothed, in reference to the bidentate neuropodial hooks present on setiger 1 of this species. Distribution. Abyssal Plain off Queensland, Eastern Australia, Coral Sea, 2093–2156 m.Published as part of Blake, James A. & Maciolek, Nancy J., 2023, New species and records of Heterospio (Annelida, Longosomatidae) from continental shelf, slope and abyssal depths of the Atlantic Ocean, Pacific Ocean, Indian Ocean and adjacent seas, pp. 1-74 in Zootaxa 5260 (1) on pages 37-38, DOI: 10.11646/zootaxa.5260.1.1, http://zenodo.org/record/779492
Laubieriellus Maciolek 1981
No full textGenus Laubieriellus Maciolek, 1981b Type-species: Laubieriellus grasslei Maciolek, 1981b Diagnosis (emended from Erickson & Wilson, 2018): Prostomium anteriorly rounded, or with slight medial incision, extended posteriorly as a caruncle, occipital tentacle absent. Peristomium distinct from chaetiger 1, partly fused to prostomium. Four pairs of branchiae from chaetiger 2; branchiae elongate, cylindrical, smooth and distinct from notopodial lamellae. Neuropodial lamellae connected by ventral crests from chaetiger 2, rarely 1. Postbranchial notopodial lamellae connected in dorsal crests. Anterior chaetae all capillaries, multidentate hooded hooks present in posterior neuropodia. Notopodial hooks absent. Pygidium with two short ventrolateral lobes or cirri and one dorsomedial cirrus, or three subequal lobes or an undifferentiated ring. Remarks: Maciolek (1981b) described Laubieriellus based on deep-sea specimens found on the Galápagos Rift and also placed Prionospio salzi Laubier, 1970 in Laubieriellus. Laubier (1970) considered his specimens as late-stage larvae, despite an adult morphology, as noted by Maciolek (1981b). The reexamination of the holotype (USNM 42621) also revealed the presence of oocytes from chaetiger 9–10. Blake et al. (2017) considered Laubieriellus as part of the Prionospio -complex, as although morphologically similar to Prionospio, Laubieriellus species lack notopodial hooks and present ventral crests on several anterior chaetigers. The ventral crest, however, is not exclusive to Laubieriellus and has been observed in Prionospio rugosa Sigvaldadóttir, 1997 and Prionospio cristaventralis, Delgado-Blas et al. 2018. The genus diagnosis was emended to include a ventral crest on chaetiger 1, as observed in Laubieriellus grasslei (Fig. 10). The notch on the ventral crests, a character generally neglected, is present in Laubieriellus grasslei (Maciolek 1981b: Fig. 4A), L. cacatua Erickson & Wilson, 2018, L. decapitata sp. nov. (Fig. 11B; 12C) and L. salzi (Laubier 1970; Dagli 2013: Fig. 3A), as indicated in Laubier’s (1970) description: “Enfin, en avant du neuropode une crête fine se prolonge ventralement presque jusqu'h la ligne médioventrale.” (Finally, in front of the neuropodium, a fine crest extends ventrally almost to the medioventral line). This notch can be shallow and incomplete, as seen in L. cacatua and L. decapitata sp. nov. , or a complete notch, as in L. salzi and L. grasslei (Fig 10 B–C).Published as part of Peixoto, Antônio João Malafaia & Paiva, Paulo Cesar De, 2019, New Prionospio and Laubieriellus (Annelida: Spionidae) species from Southeastern Brazil, pp. 529-547 in Zootaxa 4577 (3) on pages 539-540, DOI: 10.11646/zootaxa.4577.3.7, http://zenodo.org/record/263239
Anguillosyllis sepula Maciolek 2020, n. sp.
No full textAnguillosyllis sepula n. sp. Figures 30B, 34 urn:lsid:zoobank.org:act: 295ABD2B-B8DF-444F-982C-3C26DC786D21 Material examined. South China Sea,off Brunei. (7specimens from 6stations). Coll. J.A.Blake. Sta. 33, 4 Jun2011, 5 o 48′54.28228″N, 114 o 14′02.81573″E, 1370 m, 1 specimen (MCZ 150581); Sta. 45, 2 Jun 2011, 5 o 48′57.88185″N, 114 o 17′18.08262″E, 1260 m, holotype (MCZ 150582); Sta. 46, 2 Jun 2011, 5 o 48′02.68476″N, 114 o 18′10.00693″E, 1234 m, paratype (MCZ 150583); Sta. 61, 31 May 11, 5°40′32.90422″N, 114°13′15.64893″E, 1050 m, 1 specimen (NJM); Sta. WH-Jokit-SW, 5 Jun 2011, 5 o 46′27.76503″N, 114 o 07′33.98027″E, 1487 m, 1 specimen (MCZ 150584). Coll. P. Neubert. Sta. TU7, 4 Jul 2011, 5 o 19′24.21956″N, 113 o 47′15.61845″E, 1327 m, 1 specimen (MCZ 150585); Sta. TU10, 23 Jun 2011, 5 o 24′42.72532″N, 113 o 51′35.81868″E, 1354 m, 1 specimen (MCZ 150586). Description. Body with 10 setigers (Figs. 30B, 34A), colorless; holotype 1.2 mm long without anal cirri, 0.25 mm wide without parapodia, 0.5 mm wide with parapodia but excluding setae. Palps completely fused, slightly wider at base, narrowing to somewhat pointed anterior margin; prostomium oval, with three long antennae, eyes lacking; peristomium short, with two oval tentacular cirri. Nuchal cilia not noticeable even when specimen stained with Shirlastain A. Proventricle in 3–4, setigers, bluntly barrel-shaped anteriorly, gently tapered posteriorly; rows of muscle cells indistinct anterior and posterior, ca. 10 rows in middle section (Figs. 30B, 34A); post-ventricle with dorsal circlet of cells retaining MG stain (Fig. 30B). Parapodia uniramous, shortest on setiger 1, becoming longer, rectangular over next few setigers, then shorter again on setigers 9–10. Anterior and posterior parapodial lobes absent; dorsal lobe round, curled up or back on some setigers, most obvious on setigers 3–6 (Fig. 34 C–F); pad of cells that retain MG stain on posterior portion of parapodia, surrounding smooth gland that opens at tip of parapodium (Fig. 34 D–E). Dorsal cirri long, filamentous, observed only on setiger 1, possibly lost on other setigers. Ventral parapodial cirri digitiform, inserted in middle of parapodium. All setae compound, heterogomph; setiger 1 with ca. 24 setae, setigers 8–10 with 8–10 setae; several setae emerge from ventral face of parapodium between insertion of ventral cirrus and distal tip, remaining setae emerge from distal tip of parapodium. Ventral falcigers with blunt-tipped blades measuring 20–40 µm (Fig. 34B), blades of distal setae long, thin, measuring up to ca. 120 µm in middle setigers. All blades with fine proximal serrations, difficult to see even at 1500x. Parapodia each with at least two aciculae, not protruding but forming anterior and posterior bumps at distal end of parapodia; aciculae with straight or angled tips. Anal cirri fragile, mostly lost, holotype with one long filiform ventromedial cirrus, another specimen with oval lateral cirrus (lost during examination). Reproductive specimens with oocytes in coelom of setigers 6–10, oocytes crowded against or entering parapodia (Figs. 30B, 34A); oocytes appear especially large in relation to body size, measuring 85–120 µm greatest diameter (ave. = 102.9 µm, median = 107.5 µm). Remarks. Anguillosyllis sepula n. sp. is most similar to A. blakei n. sp. from offshore California, but lacks the biannulation on the dorsum of the first one or two setigers and also lacks the small anterior and posterior parapodial lobes seen in A. blakei n. sp. The large clear golden tubular gland seen in A. blakei n. sp. is not as obvious in A. sepula n. sp., being more-or-less hidden behind the pad of cells on the posterior part of the parapodium. Anguillosyllis sepula n. sp. is more robust than A. blakei n. sp.: the parapodia are slightly wider and longer when two specimens of a similar size are compared side-by-side, and A. sepula n. sp. has more setae in the first few setigers than A. blakei n. sp. The eggs are also fewer and much larger in A. sepula n. sp. than in other Anguillosyllis species examined. Etymology. From the Malay word sepuluh, meaning ten; referring to the ten setigers of this species. Records. South China Sea, off Brunei, 1234–1487 m.Published as part of Maciolek, Nancy J., 2020, Anguillosyllis (Annelida: Syllidae) from multiple deep-water locations in the northern and southern hemispheres, pp. 1-73 in Zootaxa 4793 (1) on pages 68-69, DOI: 10.11646/zootaxa.4793.1.1, http://zenodo.org/record/389615
Heterospio antonbruunae Blake & Maciolek 2023, new species
No full textHeterospio antonbruunae new species Figure 28 urn:lsid:zoobank.org:act: EA3CFFFB-FE3B-4193-8750-A55DCAB0ADF5 Material examined. (3 specimens) Indian Ocean, Mozambique Channel between SW Africa and Madagascar, International Indian Ocean Expedition, Cruise 7, R / V Anton Bruun, Sta. 363G, 05 Aug 1964, Campbell grab, 23.633°S, 43.40°E, 1350 m, holotype (LACM-AHF Poly 13321), 1 paratype (LACM-AHF 13285); Sta. 363L, 06 Aug 1964, Campbell grab, 23.283°S, 43.50°E, 84l m, 1 paratype (LACM-AHF Poly 13284). Description. All specimens incomplete, each with 11 setigerous segments. Holotype (LACM-AHF Poly 13321) 19.1 mm long and 0.26 mm wide across anterior segments; paratypes of similar lengths. Body long, thin and fragile, generally cylindrical in cross section, with distinct evidence of tearing at posterior ends; without longitudinal grooves or ridges along dorsal and ventral surfaces. Segmental boundaries denoted entirely by location of parapodia and setal fascicles. Color in alcohol opaque white; pigment entirely absent. Pre-setiger region short, as long as first two thoracic setigers (Fig. 28A–B). Prostomium oval, as long as wide, distinctly rounded on anterior margin, merged with peristomium mid-dorsally (Fig. 28B), ventrally bordered by anterior margin of mouth; eyespots absent; nuchal organs indistinct, narrow posterior lateral grooves anterior to first peristomial ring. Peristomium divided into two rings by dorsolateral grooves from which dorsal tentacles arise in other species (Fig. 28B), but tentacles not present on these specimens; location of paired grooves produce prominent mid-dorsal crest between them extending to anterior margin of setiger 1 (Fig. 28B). Mouth located mid-ventrally between prostomium and peristomium, consisting of a large oval opening surrounded by numerous short lobes (Fig. 28C); pharynx observed internally on holotype or inflated externally on paratypes. Branchiae present on setigers 2–4 (Fig. 28A–B); branchiae long, thin, rounded in cross section, tapering to rounded tip; branchiae with narrow ciliated groove; internal blood vessel extends along entire length. All parapodia biramous with setal fascicles arising from near anterior border of each segment (Fig. 28B–C). Thoracic region of holotype and one paratype (LACM-AHF Poly 13285) with six short setigers, each slightly wider than long (Fig. 28A–B); segments from setiger 7 becoming progressively longer: setiger 7 first elongate setiger, about 1.5 x as long as setiger 6 (Fig. 28A); setiger 8 about 3.5 x as long as setiger 6 (Fig. 28A), followed by a very elongate setiger 9 about as long as entire anterior region from prostomium to end of setiger 8. Paratype (LACMAHF Poly 13284) with setiger 6 first elongate, about 1.5 x as long as setiger 5. All thoracic parapodia including setiger 9 with setae arising from swollen notches; postsetal lamellae not observed. Abdominal parapodia from setiger 10 with parapodia as narrow ridges or rows extending along sides of each segment, with gaps between noto- and neurosetae. Nature of more posterior parapodia unknown. Thoracic notopodia of setigers 1–9 with numerous long capillaries in tightly packed, dense spreading fascicles, 75 or more capillaries on setigers 1–6, number of capillaries reduced on setigers 7–9; setigers 10–11 with two rows of setae, both rows with capillaries on setiger 10; setiger 11 with thin capillaries in posterior row (Fig. 28E) and thicker, spinous-like setae in anterior row, thick basally and tapering to fine point (Fig. 28D), not appearing to be either mucronate spines or subuluncini. More posterior segments and posterior end not present. Methyl Green staining. Narrow transverse line across venter on anterior thoracic setigers, otherwise no pattern. Remarks. In addition to Heterospio antonbruunae n. sp. from the Mozambique Channel in 854–1350 m, three other described species have branchiae on setigers 2–4, a broadly rounded prostomium, and the first elongate setiger anterior to setiger 9: H. angolana from 105 m off West Africa (Bochert & Zettler 2009); H. bathyala n. sp. from off the SE USA in 796–1509 m, and H. reducta, originally described from lower slope depths of 2335 m in the Mediterranean by Laubier et al. (1974) and variously reported from shallower bathyal depths off Ireland (Amoureux 1982; this study) and Iceland (Parapar et al. 2014). Of these four, H. angolana is the only one from shallow shelf depths and differs from the other three in having a single peristomial ring instead of two. Of the three deep-water species, H. antonbruunae n. sp. is most similar to H. bathyala n. sp. in having a broadly rounded prostomium and branchiae from setigers 2–4. The two species differ in that setiger 6 or 7 is the first elongate setiger in H. antonbruunae n. sp. instead of setiger 8 and the mouth opening of H. bathyala n. sp. has only 4–6 large lobes surrounding the mouth instead of many small ones. There are also acicular spines on setigers 12–14 of H. bathyala n. sp., however, these setigers are not yet known for H. antonbruunae n. sp. See Table 1 for further comparative observations. Etymology. This species is named for the R/V Anton Bruun, the primary research vessel for the International Indian Ocean Expedition surveys of 1963–1965. Distribution. Continental slope off Madagascar, Mozambique Channel, 854–1350 m.Published as part of Blake, James A. & Maciolek, Nancy J., 2023, New species and records of Heterospio (Annelida, Longosomatidae) from continental shelf, slope and abyssal depths of the Atlantic Ocean, Pacific Ocean, Indian Ocean and adjacent seas, pp. 1-74 in Zootaxa 5260 (1) on pages 56-58, DOI: 10.11646/zootaxa.5260.1.1, http://zenodo.org/record/779492
Universal scaling functions of critical Casimir forces obtained by Monte Carlo simulations
No full textEffective Casimir forces induced by thermal fluctuations in the vicinity of bulk critical points are studied by means of Monte Carlo simulations in three-dimensional systems for film geometries and within the experimentally relevant Ising and XY universality classes. Several surface universality classes of the confining surfaces are considered, some of which are relevant for recent experiments. An approach introduced previously [O. Vasilyev , EPL 80, 60009 (2007)], based inter alia on an integration scheme of free-energy differences, is utilized to compute the universal scaling functions of the critical Casimir forces in the critical range of temperatures above and below the bulk critical temperature. The resulting predictions are compared with corresponding experimental data for wetting films of fluids and with available theoretical results
- …
