Inella subfenestra 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

Inella subfenestra Kosuge, 1962

Figure 63

Inella subfenestra Kosuge 1962b: 123, pl. 8, fig. 12, text fig. 1-2.

Type locality.

Ankyaba, Setouchi-machi, Amami Islands.

Type material.

Holotype: TZM Mo. 12125 (fide Kosuge 1962b; not seen, illustrated in Higo et al. 2001: 51, G1678 as I. subfenestrata ). Paratype: NHMUK 1966148: 1 specimen, Amami Islands, Japan .

Original description.

Shell large, slender with straight side. Colour of protoconch light brown, remainder purplish pink. Protoconch of 4 whorls, nucleus dome-shaped, each whorl has 2 spiral keels overriden by axial threads.

Mature whorls 16, suture not clear and has a fine supra-sutural thread. Sculpture of 3 rows of granules, latticed by spiral costae and axial columns, upper row more slender, and nearly equal·sized on the body whorl. Granules spirally elongate, each granule apart from each other by about its diameter and 19 to a whorl. Supra-sutural thread becomes the fourth row of granules on the edge of body whorl and also fifth and sixth slender rows slightly appear on the interstices of main rows at the body whorl, two extra spiral costae at the base of body whorl and faintly granulated. Anterior canal not closed.

Shell length: 9.5 mm.

Remarks: This species is closely related to T. episcopalis (Hervier) in colour pattern, though in the latter species the median row of granules is diminished on the penultimate whorl and gradually turns to spiral thread in contrast with the former’s upper row, and somewhat like T. nocturna Hedley, though this new species differs in sculpture of both protoconch and mature whorls. Also this species is distinguished from T. xystica (Jousseaume), T. verrucosa and T. marginata (Laseron) in details of sculpture and colour pattern.

Figures

Figure 63. Inella subfenestra Kosuge, 1962, Amami Islands, Japan. A Original figure. B-G, I, J Paratype, NHMUK 1966148: front (B, C), side (D, E), back (F), protoconch (G), aperture (I), peristome (J). H NHMUK label. Scale bars: B-F: 1 mm; G: 0.2 mm; I, J: 0.5 mm.