Notosinister atratus Kosuge, 1962

Albano, Paolo G., Bakker, Piet A. J. & Sabelli, Bruno, 2019, Annotated catalogue of the types of Triphoridae (Mollusca, Gastropoda) in the Natural History Museum of the United Kingdom, London, Zoosystematics and Evolution 95 (1), pp. 161-308 : 161

Notosinister atratus Kosuge, 1962

Figure 51

Notosinister atratus Kosuge 1962a: 83, pl. 9, fig. 5, text figs 9, 13.

Type locality.

Ankyaba, Setouchi-machi, Amami Islands.

Type material.

Holotype: TZM Mo. 13039 (fide Kosuge 1962a, not seen; illustrated in Higo et al. 2001: 51, G1705). Paratype: NHMUK 1966142: 1 specimen, Amami Islands, Japan .

Original description.

Shell small, rather fusiform, inflated, rapidly attenuated to the early whorls, slightly narrowed at the base. Protoconch reddish brown, 2 spiral keels overridden by axial threads. Mature whorls 9 to 10 in number, suture well defined as a shallow groove. Sculpture 3 spiral costae, widely apart from each other and decussated with irregular axial grooves, divided into 26 ill-defined granules, upper row largest, median one faint, and turns to a thread at the antepenultimate whorl and diminished at the earlier whorls. Body whorl has 2 slightly granulated extra-costae, anterior canal slightly recurved, aperture subquadrate. White in colour at the earlier 3 whorls and remainder blackish reddish brown.

Shell length: 5.5 mm.

Remarks: This species is easily distinguished by its peculiar sculpture and colour patterns from the allied form.

Figures

Figure 51. Notosinister atratus Kosuge, 1962, Amami Islans, Japan. A Original figure. B-C, E-I Paratype, NHMUK 1966142: front (B, C), peristome (E), side (F, G), back (H), aperture (I). D NHMUK label. Scale bars: B, C, F-H: 1 mm; E, I: 0.5 mm.