identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
038C5736FF99FF8E17B1BD6FFE0196D2.text	038C5736FF99FF8E17B1BD6FFE0196D2.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Laubiericoncha Cosel & Olu 2008	<div><p>Genus Laubiericoncha n. gen.</p> <p>TYPE SPECIES. — Laubiericoncha myriamae n. sp., designated herein.</p> <p>SPECIES INCLUDED. — Laubiericoncha myriamae n. sp., L. chuni (Thiele &amp; Jaeckel, 1931) n. comb.; L. angulata (Dall, 1896) n. comb.; L. suavis (Dall, 1913) n. comb., possibly Vesicomyidae gen.et sp. indet. (Edison Seamount, see Krylova &amp; Janssen 2006: 246, pl. 4, fig. 25).</p> <p>ETYMOLOGY. — This new genus is named in memory of Prof. Lucien Laubier, Membre de l’Institut, who was one of the leading oceanographers in France and who passed away when this manuscript was in press.</p> <p>DISTRIBUTION. — Western Atlantic: SW of Barbados, Barbados accretionary prism. Eastern Atlantic: Gulf of Guinea. Eastern Pacific: Panama Bay, Baja California.</p> <p>DIAGNOSIS. — Shells medium-sized to large, subovaltriangular to oval-oblong (length: 35 to 120 mm, height about 21 to 62 mm), with subparallel dorsal and ventral margins, moderately inflated, with prosogyrate umbones situated well in front of the vertical midline. Posterior margin rounded or tapering, posteriormost point at or just above the horizontal midline. Postero-dorsal area with two shallow and rounded ridges, the more ventral of them being the posterior angle. No lunule and escutcheon. Umbones rather flattened and not prominent. Hinge with a long, thin and curved cardinal 1 and a fused cardinal 3a and 3b in the right valve and a long and strong cardinal, assumed to consist of fused 2a and 2b, and posterior short and laminar cardinal (4b) in the left valve. No posterior nymphal ridge. Ligament rather short, external. Subumbonal pit present but very small and narrow to indistinct. Pallial sinus well marked, triangular, without or occasionally with very short prolongation of the pallial line at the end of it. Ventral limb of the pallial sinus in general slightly broadened. Pallial line not completely parallel to the ventral margin but in its anterior part slightly more distant from it than in its posterior part. Anterior pedal retractor scar deep to very deep. Ctenidia with outer and inner demibranchs. Exhalant and inhalant siphonal tubes small but rather long, in correspondence to the pallial sinus, fused over their whole length, with numerous very short tentacles. Mantle lobes with outer, middle and inner mantle folds. Foot muscular and well developed, triangular. Mantle ventrally open from in front of the anterior adductor to the fusion just under the siphonal tubes.</p> <p>REMARKS</p> <p>Laubiericoncha n. gen. is distinguished from other large Vesicomyidae by a combination of characters not seen elsewhere: its outline with broadly tapering posterior part with the posteriormost point (homologue to the postero-ventral corner in Calyptogena and other genera) situated in or just above the horizontal midline giving the valves the form of a Lutraria, the short, broad, acute and triangular pallial sinus, the two “posterior angles” and the typical hinge with diverging, rather long and thin but prominent cardinals, in the right valve a curved cardinal (fused 3a and 3b), a narrow anterior cardinal (1) situated under it and a very small to indistinct subumbonal pit. Species of the genus Callogonia, also with a welldeveloped and even deeper triangular pallial sinus, are smaller, somewhat shorter, the postero-ventral</p> <p>L. suavis (Dall, 1913) n. comb. 35 mm L. sp. indet. (Edison Seamount) 47.6 mm L. angulata (Dall, 1895) n. comb. 58 mm L. myriamae n. gen., n. sp. 96 mm L. chuni (Thiele &amp; Jaeckel, 1931) n. comb. 120 mm</p> <p>corner is situated more ventrally, and in the hinge of the right valve, the cardinals 1, 3a and 3b are situated in a line, a hinge configuration also typical for Vesicomya s.s. and Isorropodon (for details, see Cosel &amp; Salas 2001). The hinge configuration of Laubiericoncha n. gen. is very close to that of Calyptogena s.s. and other Vesicomyidae hitherto grouped in Calyptogena. In Calyptogena pacifica Dall, 1891 (cf. Boss &amp; Turner 1980: fig. 10B) the type species of Calyptogena, the cardinals 1 and 3a and 3b in the right valve and the cardinals 2a and 2b in the left valve are in the same position but shorter and thicker, while the cardinal 4b in the left valve is much longer. The gills of Calyptogena s.s. have only one demibranch, whereas in Laubiericoncha n. gen. they have two. Calyptogena s.s. lacks a pallial sinus, there is no subumbonal pit, but a posterior nymphal ridge in the right valve is present.We follow Krylova &amp; Sahling (2006) in using Calyptogena in a more restricted concept.</p> <p>A superficially similar species is “ Calyptogena ” diagonalis Barry &amp; Kochevar, 1999 from cold seeps off Oregon and Costa Rica (see Barry &amp; Kochevar 1999). It is much larger (to 230 mm long) and much more elongate, but shares with Laubiericoncha n. gen. the short ligament, the ctenidia with two demibranchs, the shallow but acute pallial sinus and the inclined ventral pallial line, which, however, in “ C. ” diagonalis is not slightly but markedly oblique. Th e posterior angle is rounded but much more pronounced and ends in a postero-ventral corner but not as high as in the horizontal midline as in Laubiericoncha n. gen. In “ C. ” diagonalis, the basic arrangement of the teeth (see Barry &amp; Kochevar 1999: fig. 1h) in the right valve is close to that of Laubiericoncha n. gen., however, in Laubiericoncha n. gen., the cardinals are much thinner and more elongately stretched. In the left valve, the dentition of “ C. ” diagonalis has a different, more “venerid” aspect, with longer 2a and stronger 2b, according to the images, there is a small but well-marked subumbonal pit. Krylova &amp; Sahling (2006) exclude C. diagonalis from Calyptogena in the strict sense but do not place it in another genus.</p> <p>The most similar genus is Archivesica Dall, 1908 (type species: Vesicomya gigas Dall, 1895). As in Laubiericoncha n. gen., the gills have two demibranchs, the subumbonal pit is also relatively small, but larger than in Laubiericoncha n. gen. However, the pallial sinus has a different form: it is shorter, broader and not acute but just concave; the siphons are thicker and shorter, without tentacles seen. The anterior pedal retractor scar is shallow, in contrast to the deep scar in Laubiericoncha n. gen. In Archivesica gigas, the shell is more subquadrate and more tumid, the umbones are more prominent, the posterior margin is not tapering, the ventral margin is straight, whereas in Laubiericoncha n. gen. it is slightly to markedly convex (see Fig. 6B, for further figures of Archivesica gigas see Cosel [2006: 144, as “ Calyptogena gigas ”])</p> <p>Besides Laubiericoncha myriamae n. gen., n. sp. and L. chuni (Thiele &amp; Jaeckel, 1931) n. comb., Callogonia angulata Dall, 1895 from the Gulf of Panama (2320-3050 m) is the third species to be placed in Laubiericoncha n. gen. According to the figure in Dall (1908: fig. 263), it has a much more acute posterior margin than the two Atlantic species and is still more tapering posteriorly (see Fig. 6). The hinge of the figured right valve has the same configuration. Finally, following Krylova &amp; Janssen (2006), we include also Vesicomya suavis Dall, 1913 from the W coast of Baja California, W of Tiburon Island (Animas) (25°N, 1345 m). Although Dall’s figure (Dall 1925: pl. 27 fig. 1) shows only an external view, thanks to an unpublished sketch of the holotype (33.4 × 21.5 mm) by E. Krylova, the hinge dentition and pallial sinus prove its placement in the new genus. An undescribed species presumably also to be placed in the genus Laubiericoncha n. gen. has recently been collected on Edison Seamount (SW Pacific) by the German RV Sonne (Krylova &amp; Janssen 2006: 246, pl. 4 fig. 25). As the single valve obtained is of poor quality, we cannot positively confirm this until more and better material becomes available. A further undescribed species cited for the new genus by Krylova &amp; Janssen (2006: 249) comes from the Holocene of Gakkel Ridge in the Arctic. The known maximum lengths of each species are marked in Table 1.</p> </div>	https://treatment.plazi.org/id/038C5736FF99FF8E17B1BD6FFE0196D2	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Cosel, Rudo Von;Olu, Karine	Cosel, Rudo Von, Olu, Karine (2008): A new genus and new species of Vesicomyidae (Mollusca, Bivalvia) from cold seeps on the Barbados accretionary prism, with comments on other species. Zoosystema 30 (4): 929-944, DOI: 10.5281/zenodo.4525869
038C5736FF9FFF8D17A1BAB0FC10966C.text	038C5736FF9FFF8D17A1BAB0FC10966C.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Laubiericoncha myriamae Cosel & Olu 2008	<div><p>Laubiericoncha myriamae n. sp.</p> <p>(Figs 1; 2; 5C, D; 7A)</p> <p>“ Vesicomyidae sp.” – Faugères et al. 1987: 117. Vesicomya aff. chuni – Jollivet et al. 1990: 31; fig. 7b.</p> <p>Vesicomya sp. – Olu et al. 1996: 371.</p> <p>TYPE MATERIAL. — Holotype: Barbados accretionary prism, site Orénoque B (Dome 13), DIAPISUB, stn PL DS 10 /15, 10°19.97’N, 58°37.30’W, 1949 m, 2.I.1993, 1 spm. (MNHN 20550).</p> <p>Paratype: same locality, site Orénoque A, 10°20.27’N, 58°53.73’W, 1730 m, DIAPISUB, stn PL DS 03/1, 1 spm. (MNHN 20551).</p> <p>TYPE LOCALITY. — Southern part of Barbados accretionary prism, ESE of Trinidad.</p> <p>ETYMOLOGY. — Dedicated to our colleague Myriam Sibuet, cruise leader of ZAIANGO BIOL 2, BIOZAIRE and BIOZAIRE 2.</p> <p>OTHER MATERIAL EXAMINED. — Barbados accretionary prism (no precision), DIAPICAR cruise, 1 lv., 1 juv. rv., both older and discoloured brown (see Jollivet et al. 1990: fig. 7b). — Barbados accretionary prism, site Orénoque A, 10°19.72’N, 58°53.21’W, 1689 m, DIAPISUB, stn PL DS 04/2, 1 juv. spm. (all MNHN).</p> <p>DISTRIBUTION. — Southern Caribbean, ESE ofTrinidad, only known from the type locality.</p> <p>DESCRIPTION</p> <p>Shell to 96 mm long (see Table 2), oblong-oval, rather thick and moderately tumid.Anterior margin</p> <p>broadly rounded. Ventral margin convex, in the middle part straight. Posterior margin rounded, somewhat more narrowly rounded close to the horizontal midline. Umbones very shallow; beaks prosogyrous, well in front of the vertical midline, in fully grown specimens just before the end of the anterior third of the valve.</p> <p>Surface with fine, dense, irregular commarginal ridges and some coarser irregular growth waves and stages, stronger and more pronounced towards the ventral part and close to the ventral margin. There are also some fine, irregular and more or less oblique wrinkles on the anterior and postero-dorsal part of the valves, partly becoming slightly laminar. Lunule and escutcheon absent. In place of the escutcheon and parallel to the postero-dorsal margin a sulcus with a rounded delimitation which can be characterized as a second posterior angle. Posterior angle closely below this ridge rounded but well marked and ending at the posterior extremity. Between the two “angles” a shallow radial depression, in which the wrinkly sculpture is more pronounced than on the rest of the shell. Periostracum yellowish, glossy on the earlier part of the shell, becoming more dull ventrally and posteriorly.</p> <p>Hinge line short and rather narrow but strong. Right valve with a lower anterior, strong and laminar cardinal (1) starting almost parallel to the anterodorsal margin, then curving upwards and ending directly under the beaks, and a longer and stronger posterior cardinal, assumed to be fused 3a and 3b. It starts above the lower part of the anterior tooth (1) parallel to it, ascends towards the umbo and then descends backwards to beneath the anterior part of the ligament, with anterior limit almost vertical. Left valve anteriorly with a long, strong and somewhat irregular tooth 2a ascending towards the dorsal margin and situated under the umbo and in front of it. Cardinal 2b fused with cardinal 2a under the umbo, descending to the ventral margin of the hinge plate and inclined anteriorly. Posteriorly to the teeth 2a and 2b the shorter and laminar posterior cardinal (4b), inclined towards posteriorly. Ligament external, opisthodetic, rather short, on a narrow but strong nymphal plate. Subumbonal pit very small, shallow to indistinct. Pallial sinus short but well developed, nearly triangular, acute and pointing to about the middle of the anterior adductor scar; no prolongation of the pallial line on the anterior side of the sinus extremity. Anterior pedal retractor scar deep, separate from the anterior adductor scar. Posterior pedal retractor scar united with the posterior adductor scar. Inside of the valves with very faint, irregularly sized and spaced vermiculations or waves, more pronounced in the posterior part, and a very weak rib running from the umbonal cavity to the lower tip of the anterior adductor scar.</p> <p>Valves entirely white.</p> <p>Ctenidia large and fleshy, inner demibranch with about half the shell length (53 mm in the holotype), outer demibranch shorter, 45 mm in the holotype (see Fig. 5C). Food groove very narrow and visible in both demibranchs. Exhalant and inhalant siphonal tubes small but rather long, fused over their whole length, with numerous very short tentacles around the common opening (Fig. 5D). Siphonal</p> <p>tentacles with a small thickening at their ends. Inner mantle fold in its posterior part with very small, blunt tentacles for a length of about 3 mm (holotype) on both sides from the mantle fusion under the inhalant siphonal tube towards anterior. Foot muscular, laterally somewhat flattened.</p> <p>BIOTOPE</p> <p>Laubiericoncha myriamae n. sp. has been sampled on two cold seep sites on the southern part of the Barbados accretionary prism. The first site is located at the top of a diapiric ridge of the Orénoque A sector described by Faugères et al. (1987) and Jollivet et al. (1990) (DIAPICAR cruise) and by Olu et al. (1996) (DIAPISUB cruise with submersible). The species was living there together with two Bathymodiolus species, B. boomerang Cosel &amp; Olu, 1998 and Bathymodiolus sp. aff. B. childressi Gustafson,Turner, Lutz &amp; Vrijenhoek, 1998 (see also Olu-Le Roy et al. 2007b) and with several species of “vestimentiferan” worms (Siboglinidae, Polychaeta). Aggregates of a few tens of L. myriamae n. sp. were observed in the sedimentary areas and a few individuals were observed around the Bathymodiolus spp. aggregates, associated with carbonate concretions. Numerous shells were also observed; some of them were taken and dated, their age was between 10 000 and 20 000 years. Temperature gradient measurements in the sediment indicated active fluid venting at this site. The second site is located at the top of a mud dome of the Orénoque B sector (Olu et al. 1996). Laubiericoncha myriamae n. sp. was living there in small aggregations in association with Bathymodiolus boomerang and Siboglinidae.Temperature measurement indicated no active venting at this time.</p> <p>REMARKS</p> <p>Laubiericoncha myriamae n. sp. is close to L. chuni n. comb. (see below) but is slightly shorter and is distinguished by the more regular elongate-oval outline with more rounded and less tapering posterior margin, subparallel dorsal and ventral margins, the broader hinge plate, the less pronounced to obsolete commarginal wrinkles giving the surface a smooth appearance, and the periostracum which on the whole valve is glossy and not leafy as in L. chuni n. comb. The valves of L. myriamae n. sp. are somewhat thicker and heavier.The subumbonal pit is very small and almost indistinct, whereas in L. chuni it is small but deep and well distinguished. The umbones of L. chuni n. comb. are slightly more prominent and placed more forward than in L. myriamae n. sp. The tube uniting the fused siphons is slightly smaller and more delicate than in L. chuni n. comb.</p></div> 	https://treatment.plazi.org/id/038C5736FF9FFF8D17A1BAB0FC10966C	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Cosel, Rudo Von;Olu, Karine	Cosel, Rudo Von, Olu, Karine (2008): A new genus and new species of Vesicomyidae (Mollusca, Bivalvia) from cold seeps on the Barbados accretionary prism, with comments on other species. Zoosystema 30 (4): 929-944, DOI: 10.5281/zenodo.4525869
038C5736FF9CFF871455BA11FE1F9016.text	038C5736FF9CFF871455BA11FE1F9016.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Laubiericoncha chuni (Thiele & Jaeckel 1931) Cosel & Olu 2008	<div><p>Laubiericoncha chuni (Thiele &amp; Jaeckel, 1931) n. comb.</p> <p>(Figs 3; 4; 5A, B; 7B)</p> <p>Vesicomya chuni Thiele &amp; Jaeckel, 1931: 228, pl. 9 (4), fig. 100.</p> <p>Vesicomya (Callogonia) chuni – Boss 1970: 68, 69, figs 1, 2, 21, 24.</p> <p>“ Vesicomya ” chuni – Cosel &amp; Salas 2001: 356-358, figs 74, 75, 96, 97, 107.</p> <p>TYPE MATERIAL. — Lectotype, a lv., selected by Boss (1970: 68) (ZMB Moll. 77848a); paralectotype: same locality, a rv., (ZMB Moll. 77848a), both trawled by RV Valdivia. The numerous additional valves from the same locality (ZMB Moll. 77848b) were not mentioned by Boss (1970) apparently he may not have seen them. These valves are also paralectotypes.</p> <p>TYPE LOCALITY. — W of Campo, Cameroon, Gulf of Guinea, 2°00’N, 8°4.3’E, 2492 m.</p> <p>OTHER MATERIAL EXAMINED. — Cabinda, W of Congo river mouth, REGAB site, N of Congo Canyon, 5°46.89’S, 9°44.65’E, 3159- 3113 m, trawled by RV Atalante, BIOZAIRE 3 cruise, stn CP 20, 2.I.2004, leg. R. von Cosel, numerous sh., valves and fragments. W of Congo (Brazzaville), ASTRID site, ZAIROV 2 cruise, ROV Victor, stn Pl 73-13 (CT 0), 4°57’S, 10°09.5’E, 2820-2840 m, 1 juv. sh. (all MNHN).</p> <p>DISTRIBUTION. — Gulf of Guinea from Cameroon (2°N) to the Congo Canyon (5°46’S). Boss (1970) mentions an additional record from SE of Accra, Ghana at 4°58’N, 3°48’E, 2268-2332 m, RV Pillsbury (University of Miami), stn 314.</p> <p>DESCRIPTION</p> <p>Shell to 120 mm long (see Table 3), oblong-oval, quite variable in shell shape and outline, moderately</p> <p>tumid, rather light and thin-shelled and only in large fully grown specimens occasionally becoming thicker. Anterior margin broadly rounded. Ventral margin convex, in the middle part slightly convex, in very large specimens occasionally almost straight. Posterior part broadly tapering, ending in a rounded corner close to the horizontal midline. Umbones very shallow; beaks prosogyrous, well in front of the vertical midline, in fully grown specimens just before the end of the anterior third of the valve.</p> <p>Surface dull, chalky, with fine, very densely spaced, irregular commarginal, slightly laminar ridges which on the anterior, ventral and posterior part of the valves become more or less wrinkly and oblique. Earliest part almost smooth, only with fine to indistinct growth lines. Lunule and escutcheon absent.In place of the escutcheon and parallel to the postero-dorsal margin a sulcus with a rounded delimitation which can be characterized as a second posterior angle (see also Boss [1970]). Posterior angle closely below this ridge rounded but well marked and ending at the posteriormost margin. Between the two “angles” a shallow radial depression, in which the wrinkly sculpture is denser than on the rest of the shell. On juvenile and subadult specimens periostracum glossy, pale straw-coloured, especially on the earlier parts, on fully grown specimens more brownish on the ventral part and more or less eroded on the rest of the shell, close to the margins becoming slightly leafy along the lamellae.</p> <p>Hinge line rather narrow and short. Right valve with a lower anterior, strong and laminar cardinal tooth (1), which starts almost parallel to the antero-dorsal margin, then curves upwards and ends directly under the beaks, and a longer and stronger posterior tooth, assumed to be fused 3a and 3b. It starts above the anterior tooth parallel to it, ascends towards the umbo and then descends backwards to beneath the anterior part of the ligament, in form of an inverted “V”. Left valve anteriorly with a strong and somewhat irregular tooth 2a ascending towards the dorsal margin and situated beneath the umbo. Cardinal 2b thick and more or less triangular, fused with cardinal 2a under the umbo, descending vertically to the ventral margin of the hinge plate or somewhat inclined towards anteriorly. Posterior to 2a and 2b the well-inclined laminar posterior tooth (4b), inclined towards posteriorly. Ligament external, opisthodetic, rather short, on a narrow but strong nymphal plate. Subumbonal pit very short, shorter than 4a or 3a + 3b teeth, but deep and well marked. Pallial sinus variable, more or less deep, nearly triangular, acute or more rounded at the end and pointing to the upper limit of the anterior adductor scar; prolongation of the pallial line on the anterior side of the sinus extremity in general absent, in few specimens, however, a very small prolongation can be seen. Anterior pedal retractor scar deep to very deep, separate from the anterior adductor scar. Posterior pedal retractor scar united with the posterior adductor scar. Inside of the valves with very faint, irregularly sized and spaced radial vermiculations or waves and a very weak rib running from the umbonal cavity to the lower tip of the anterior adductor scar.</p> <p>Valves whitish, with pale reddish brown hue on the interior within the limits of the pallial line.</p> <p>Ctenidia with two demibranchs, large, moderately thick and fleshy, 52 mm long (inner demibranch) and about 45 mm (outer demibranch) in a 93 mm specimen (38 mm and 34 mm in a 88.4 mm specimen).Weak food-groove visible in both demibranchs. Siphons small but rather long and fused (in the preserved specimens retracted). Inhalant siphon with numerous very short tentacles, not well visible in preserved specimens. Blood with haemoglobin. Inner mantle fold in its posterior part with small blunt tentacles for a length of about 10 mm on both sides from the mantle fusion under the inhalant siphonal tube towards anterior.</p> <p>BIOTOPE</p> <p>Laubiericoncha chuni n. comb. has been sampled on the giant pockmark called REGAB (south of Gabon, 6°S) which is a very active cold seep site (Ondreas et al. 2005; Olu-le Roy et al. 2007a), it is situated 8 km N of the Congo Canyon at 3150 m depth. Methane rich fluids are expelled at different places on the pockmark, and preferentially in its central zone where carbonate concretions</p> <p>A</p> <p>B</p> <p>C, D</p> <p>are developed. Laubiericoncha chuni n. comb. was collected in sedimentary areas at the southwestern part of the pockmark where a very large (100 × 50 m) vesicomyid field was observed. Other vesicomyid agregations occurred in the central area in dark and sulfide rich sediment around the concretions. Laubiericoncha chuni n. comb. co-occurs with another large vesicomyid species, which is currently under description by the present authors. During beam trawl operations on the northern part of the pockmark during the BIOZAIRE3 cruise (December 2003 - January 2004), the trawl accidentally hit a large agglomeration of mostly empty fresh shells of both species on rather sticky grey mud, among them hundreds of complete shells and a few live specimens of Laubiericoncha n. gen. The material taken by the Valdivia off Cameroon consisted of old and subrecent-looking valves only, and it cannot be excluded that the seeps at that very place are not active any more.</p> <p>REMARKS</p> <p>The type material of L. chuni n. comb. was already figured and the separation of Laubiericoncha n. gen. from Callogonia Dall, 1889 discussed by Cosel &amp; Salas (2001: 356-358, figs 74, 75, 96, 97, 107). Subsequently, during the BIOZAIRE cruises, live-collected specimens of Laubiericoncha n. gen. already considered very close to L. chuni n. comb., were taken on the REGAB cold-seep site (see above). The specimens of this population show slight differences from the type material of L. chuni n. comb. originating from off Cameroon (2°N), which is situated at a distance of about 900 km to the North of REGAB. However, both populations are very variable in outline, and much overlap occurs. REGAB specimens are in general more elongate-lutrariform and more thin-shelled than the specimens from Cameroon, the beaks are situated more forward, the ventral margin is often less convex to almost straight in its middle. The hinge teeth are, within their basic configuration typical for the genus, quite variable in length and form. However, given the variability of the vast collected material from the REGAB site and all specimens from the type locality, we do not see any reason for morphologically separating the Gabon-Congo specimens from the Cameroon specimens of Laubiericoncha chuni n. comb. at species or subspecies level.</p> </div>	https://treatment.plazi.org/id/038C5736FF9CFF871455BA11FE1F9016	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Cosel, Rudo Von;Olu, Karine	Cosel, Rudo Von, Olu, Karine (2008): A new genus and new species of Vesicomyidae (Mollusca, Bivalvia) from cold seeps on the Barbados accretionary prism, with comments on other species. Zoosystema 30 (4): 929-944, DOI: 10.5281/zenodo.4525869
