Bathyterebra zhongshaensis Malcolm, Terryn & Fedosov, 2020

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 : 23

Bathyterebra zhongshaensis Malcolm, Terryn & Fedosov newspecies

( Fig. 2H )

Type material: Holotype: MNHN IM-2013-61800 , 17.4 mm; South China Sea, Helen Shoal, 19°13'N, 113°55'E, 470–494 m (ZhongSha 2015 Stn DW4138).

Zoobank registration: urn:lsid:zoobank.org:act:C8461C7A-BF53-48D4-BE1B-EF23F17413F8

Diagnostic nucleotide positions: Table 11 .

Description: Shell small, with orthocline spire, wide apical angle. Protoconch wide, paucispiral, 2.5 whorls, with small nucleus. Teleoconch 9 whorls. Early whorls convex in outline with strong, sharply convex ribs; subsequent whorls with narrow constriction formed by indentation, with straight ribs below suture; suture distinct, ragged; mature whorls with less convex outline, weaker and more numerous ribs, 30 on penultimate whorl. Spiral sculpture of very weak threads. Last whorl bulbous at base, but elongate with wide aperture. Columella straight, with weak fold. Overall colour white, with extensive patches of light-tan axial flammules on mature whorls.

Habitat: Depths of 470– 494 m.

Distribution: Only known from type locality.

Etymology: Named for the Zhongsha sand bars, which form a subsurface atoll on top of the Macclesfield Bank.

Remarks: Bathyterebra zhongshaensis n. sp. is similar to the deep-water species, B. coriolisi and B. benthalis . Bathyterebra coriolisi ( Fig. 2E ) is similar in colour, in the sculpture of the early whorls and in the shape of its aperture. However, B. coriolisi differs in having a much narrower shape, with a strong subsutural groove and fewer ribs on the early whorls, creating a band with nodes. Its subsutural groove becomes weaker, with just a slight indentation on mature whorls. Bathyterebra benthalis ( Fig. 2I ) is similar in colour and in overall sculpture of the shell, but differs from B. zhongshaensis n. sp. in the outline of its mature whorls being flat and the ribs on the early whorls extremely convex, creating nodes that dominate the profile of the early whorls.

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.