Leucosyrinx diomedea ( Powell, 1969 ), 2025

Kantor, Yuri I., Fedosov, Alexander & Puillandre, Nicolas, 2025, Revision of the Indo-Pacific species of the genus Leucosyrinx Dall, 1889 (Neogastropoda: Conoidea: Pseudomelatomidae), European Journal of Taxonomy 999, pp. 1-126 : 94-95

Leucosyrinx diomedea ( Powell, 1969) comb. nov.

Fig. 23J–L

Comitas thisbe diomedea Powell, 1969: 277 (23-289), pl. 225 figs 3–4.

Type material

Holotype

SULAWESI • Celebes (Sulawesi), off Tg. Lamulul, Gulf of Boni; 04°53′45″ S, 121°29′ E; depth 540 ftm (= 987 m); Albatross stn 5650; USNM 239425 .

Remarks

The species is known from two specimens, collected off Sulawesi, Indonesia. It is rather similar to L. luzonica , differing in the more gradual narrowing of the last whorl towards the canal. It may represent a form of L. luzonica , but due to very limited material on both species, we are taking a conservative approach and consider it a separate species. Conchologically, it is very different from L. thisbe ( Fig. 17A–

E) in that its axial folds do not extend to the shell base, it has weaker spiral sculpture, lacks a subsutural fold, and has a slenderer shell. Therefore, we consider it a valid species.

Kosuge (1992: pl. 59 figs 6–7) illustrated a very slender specimen under this name, the identity of which cannot be determined with certainty based on the provided photograph. The radular drawing ( Kosuge 1992: figs 17–21) shows duplex marginal teeth, which are typical of Leucosyrinx .

Distribution

Sulawesi to (?) western Australia, 496– 987 m.

Figures

Fig. 23. A–H. Leucosyrinx luzonica (Powell, 1969). A–C. Holotype, USNM 238476, SL 42 mm (photo courtesy of USNM). D–F. MNHN-IM-2013-59559, off Taiwan Bank, 1634–1683 m, SL 39.1 mm. G. MNHN-IM-2009-13472, Philippines, 1456–1471 m, SL 26.6 mm. H. MNHN-IM-2009-13444, Philippines, 1762–1806 m, SL 23.1 mm. I. Leucosyrinx sp. 19, MNHN-IM-2007-42539, Solomon Is., 1250–1402 m, SL 26.8 mm. J–L. Leucosyrinx diomedea (Powell, 1969) comb. nov., holotype, USNM 239425, SL 49 mm (photo courtesy of USNM). All shells at the same scale.

Fig. 17. A–E. Leucosyrinx thisbe (E.A. Smith, 1906). A–B. Holotype, ZSI, M 1233/1, SL 44 m (from the site of ZSI, https://zsicollections.in/specimen/ZSI0000003967). C–E. MNHN-IM-2009-16821, Solomon Is., 1230–1306 m, SL 75.1 mm. F–H. Leucosyrinx sp. 13, MNHN-IM-2009-13552, northern New Caledonia, 600–1100 m, SL 39.6 mm. I–J. Leucosyrinx melvilli (Schepman, 1913), syntype, NATURALIS, ZMA.MOLL.137982, SL 62 mm (photo courtesy of NATURALIS). All shells at the same scale.