Leucosyrinx diomedea Kantor & Fedosov & Puillandre 2025, comb. nov.

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.