Cautor (Cautor) maculosus mcmichaeli 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

Cautor (Cautor) maculosus mcmichaeli Kosuge, 1962

Figure 59

Cautor (Cautor) maculosus mcmichaeli Kosuge 1962a: 85, pl. 10, fig. 8, text figs 7, 14.

Type locality.

Ankyaba, Setouchi-machi, Amami Islands.

Type material.

Holotype: TZM Mo. 13042 (fide Kosuge 1962a; not seen, illustrated in Higo et al. 2001: 51, G1745). Paratype: NHMUK 1966150: 1 specimen, Amami Islands, Japan .

Original description.

Shell rather small, conical, lower spire somewhat cylindrical, not narrowed at the base. Protoconch of 3 whorls, apex blunt, second and third whorls have a single spiral keel overridden by axial threads, pure white in colour. Mature whorls 9, suture distinct as a deep groove with a fine supra-sutural thread. Sculpture 3 rows of granules, upper row largest, median one diminished and gradually disappears on the early whorls, each granule almost rounded, connected by axial columns and fine spiral keels, beset close together and 23 to a whorl. On the body whorl, there are other 2 rows of granules and 1 smooth keel on the base, anterior canal broad and slightly recurved, aperture rounded. Irregularly variegated with opaque white, buff and chocolate, usually maculated white and chocolate, base chocolate.

Shell length: 6 mm.

Remarks: This subspecies is closely related to C. maculosus (Hedley) in sculpture, colour and the nature of protoconch, though it is much more slender than that species and its whorls are much more squarishly angulated at the base.

Figures

Figure 59. Notosinister maculosus macmichaeli Kosuge, 1962, Amami Islands, Japan. A-E, G-J Paratype, NHMUK 1966144: front (A, B), side (C, D), back (E), protoconch (G, H), aperture (I), peristome (J). F Original figure. K NHMUK label. Scale bars: A-E: 1 mm; G, H: 0.2 mm; I-J: 0.5 mm.