Leptaxinus

Oliver, P. Graham, 2015, Deep-water Thyasiridae (Mollusca: Bivalvia) from the Oman Margin, Arabian Sea, new species and examples of endemism and cosmopolitanism, Zootaxa 3995 (1), pp. 252-263 : 261

“ Leptaxinus ” indusarium Oliver & Levin, 2006

Fig. 4 J

Material. Eight specimens, Off Ras Madrakah, southern Oman, Discovery cruise 211 st. 12714#1, 19°10.74´N 58°20.33´E to 19°10.10´N 59°19.50´E, 919–967 m, collected P.G. Oliver, 28 October 1994. NMW.Z. 1995.009.20.

Description. This species is fully described in the original description and is accompanied by a full discussion on the generic affinities. An illustration is given here for completeness.

Remarks. The generic placing of this species remains uncertain as there are no molecular data for other species of Leptaxinus . The type material was obtained from off the Indus Fan at 879 m with dissolved oxygen levels between 0.1 and 0.2ml l -1. The Oman data are similar in both depth and oxygen concentrations and confirms the original hypothesis that this species is restricted to hypoxic environments in the Arabian Sea.

Figures

FIGURE 4. A, Axinulus aff. croulinensis, Oman margin; B, Axinulus croulinensis Jeffreys, Loch Fyne, 40 m, Scotland, National Museum Wales; C, Axinulus undescribed, Gulf of Mexico, National Museum Wales; D, A. brevis Verrill & Bush, Rockall Trough, 1595 m, National Museum Wales; E – F, Mendicula aff. ferruginosa, Oman margin; G – H, Mendicula ferruginosa Forbes, Rockall Trough, 1595 m, National Museum Wales; I, Leptaxinus indusarium Oliver & Levin, holotype, National Museum Wales, NMWZ. 2005.34.1.