Bathyterebra, Fedosov & Malcolm & Terryn & Gorson & Modica & Holford & Puillandre, 2019

Fedosov, Alexander E, Malcolm, Gavin, Terryn, Yves, Gorson, Juliette, Modica, Maria Vittoria, Holford, Mandë & Puillandre, Nicolas, 2019, Phylogenetic classification of the family Terebridae (Neogastropoda: Conoidea), Journal of Molluscan Studies The Malacological Society of London 85 (4), pp. 359-388 : 6-7

Genus Bathyterebra new genus

( Fig. 2 E–I)

Type species: Terebra benthalis Dall, 1889 .

Zoobank registration: urn:lsid:zoobank.org:act:EF1F9047-25AB-4400-A1D4-C705B757E114

Definition: Includes species with combination of conchological, anatomical and distributional characteristics closely comparable with Bathyterebra benthalis , including all species in clade A2 of Modica etal. (2019) and any species proven to be a member of this clade.

Diagnosis: Diagnostic nucleotide combinations in Table 1 .

Shell: Small, 12–30 mm, elongate, white to tan. Protoconch paucispiral, cyrthoconoid, about 1.5 glossy whorls. Sculpture of fine dense orthocline ribs, interrupted by depression in adapical portion of whorl. Axial ribs weakening towards anterior throughout their height on mature whorls, often forming weak nodules bordering adapical depression, giving distinctly angulated outline to early spire whorls; late teleoconch whorls gently convex. Last adult whorl evenly convex, transitioning to shell base without visible angulation. Siphonal canal stout, slightly recurved at tip, shallowly notched; siphonal fasciole weak or strong. Aperture elongate, wide.

Anatomy: Rhynchodeal introvert small; proboscis, radular sac, salivary and venom glands well developed. Accessory proboscis structure absent. Radula with well-developed membrane, bearing 2 rows of wide marinal teeth of duplex type.

Distribution: South China Sea, New Caledonia, Caribbean; bathyal depths.

Etymology: Name refers to bathyal depths, at which three known species of the genus were sampled. Gender feminine.

Remarks: Bathyterebra spp. can be differentiated from members of most other genera of Terebridae by the combination of relatively faint sculpture lacking spiral elements, weakly defined subsutural band and relatively high last adult whorl with convex outline. In shell proportions the genus resembles Oxymeris ; however, the latter has more flattened whorls and typically can be easily differentiated by a larger size at maturity.

Included species:

Bathyterebra benthalis (Dall, 1889) 1 n. comb.;

B. coriolisi (Aubry, 1999) 1 n. comb.;

B. zhongshaensis Malcolm, Terryn & Fedosov 1 n. sp.

Figures

Figure 2. Subfamily Pellifroniinae. A–C. Pellifronia jungi. A. MNHN-IM-2013-52275, NANHAI 2014 Stn DW4102, 15◦03'N, 116◦31'E, 339–533 m, 25.5 mm. B. MNHN-IM-2013-52249, EXBODI Stn CP3831, 22◦02'S, 167◦09'E, 523–560 m, 24 mm. C. MNHN-IM-2007-30591, SALOMON 2 Stn CP2195, 08◦26'S, 159◦26'E, 543–593 m, 29 mm (broken), D. Pellifronia brianhayesi holotype, MNHN-IM-2000-20800, S Mozambique, 22.6 mm. E–G. Bathyterebra benthalis. E. MNHN-IM-2013-60185, KARUBENTHOS 2015 Stn CP4524, 16◦29'N, 61◦42'W, 500–550 m, 35.5 mm. F, G. MNHN-IM- 2013-61124, KARUBENTHOS 2015 Stn DW4608, 9.3 mm. H. Bathyterebra zhongshaensis n. sp. holotype, MNHN-IM-2013-61800, ZhongSha 2015 Stn DW4138, 19◦13'N, 113◦56'E, 470–494 m, 17 mm. I. Bathyterebra coriolisi, MNHN-IM-2013-52331, CONCALIS Stn DW3001 18◦32'S, 163◦09'E, 390–400 m, 12.4 mm.

Tables

Table 1. Subfamily Pellifroniinae and included genera: diagnostic combinations of nucleotides in COI alignment.

Subfamily Pellifroniinae
Species/sequences analysed	4/25
Diagnostic nucleotides:	88: T, 299: G, 334: A, 530: A
Genus Pellifronia
Species/sequences analysed	1/11
Diagnostic nucleotides:	76: C, 208: T, 299: G, 301: A
Genus Bathyterebra n. gen.
Species/sequences analysed	3/14
Diagnostic nucleotides	76: T, 88: T, 299: G, 622: C