Spergo chuni, comb. nov.

Spergo? chuni (von Martens, 1901) comb. nov. Fig. 35A Pleurotoma (Pseudomata [sic]) chuni von Martens, 1901: 19. Comitas chuni – Powell 1969: 274 (23-286), pl. 221 fig. 1. Type material Holotype INDONESIA • west coast of Sumatra; 1°48′ N, 96°53′ E; depth 1143 m; ZMB Moll 60091. Remarks This large species (with SL 98.9 mm in the holotype), along with Spergo sibogae Schepman, 1913, was attributed to Comitas by Powell (1969) without much discussion. He simply mentioned that “Both species fit reasonably well into the genus Comitas ” (p. 274 (23-286)). At the same time, Powell noted that “The figure of this species, which was referred to Pontiothauma by von Martens (1904), suggests, by the growth lines, a rather deep turriculid-style sinus, quite foreign to that of Pontiothauma, which has at most a very weak sutural sinus.” The type of Pleurotoma chuni is rather similar to Spergo Dall, 1895, particularly to Spergo sibogae, although its anal sinus is slightly deeper than in the mentioned species (Crisсione et al. 2021: fig. 11f). Nevertheless, the shape of the sinus is quite different from those of Leucosyrinx and Comitas. The position of S. sibogae within Spergo was confirmed by a multilocus molecular analysis (Crisсione et al. 2021). Based on the similarity between the shells of Pleurotoma chuni and Spergo sibogae, we reallocate the former species to Spergo (Raphitomidae) with some reservations. Distribution Type locality.