Amalda hayashii Ninomiya 1988

Amalda hayashii Ninomiya, 1988

Figs 19 J–K, 20F–I

Amalda (Alcospira) hayashii Ninomiya, 1988: 145, pl. l figs 7–8.

Amalda hayashii – Okutani 2000: 523, pl. 260, fig. 3 (erroneously labelled as A. hilgendorfi). — Tsuchida 2017: atlas: 332, pl. 288 fig. 2, text: 995.

Type material

Holotype

SOUTHERN JAPAN • Amami-Oshima Island; Ninomiya collection [not seen].

Material examined

9 sequenced specimens (Table 1).

Description

MEASUREMENTS. Shell medium in size (SL up to 50 mm).

SHELL. Ovate-fusiform, with medium high, weakly cyrtoconoid spire. Primary spire callus thick, strongly pustulose except smooth last whorl, covering all whorls, except tip of protoconch, rendering measurements impossible. Secondary callus rather thin, with indistinct borders, microshagreened, weakly glossy, fusing with parietal callus without visible border, and reaching antepenultimate whorl and merging into primary callus. Plication plate from nearly smooth to bearing up to 5 ridges, columella smooth or with traces of plicae. Olivoid groove shallow to very shallow, labral denticle short, obtuse, rounded. Anterior band microshagreened, upper anterior band weakly convex with median or shifted more abapically, obtuse ridge, lower anterior band flat. Primary callus yellow-brownish on spire and slightly darker abapically, also bordered by almost white, medium broad, band. Secondary callus whitish, translucent. Body whorl cloak light chestnut with slight purple tint, olivoid band whitish, anterior brown, lower anterior band lighter, plication plate creamy.

RADULA (n=3, sequenced, Fig. 20 F–I). With simple, hook-shaped lateral teeth. Central teeth quite variable, from tridentate with large, smooth cusps, central smallest (Fig. 20I), with serrated cusps and lateral flaps (Fig. 20G), to multicuspid central with five smooth cusps, central three much smaller than lateral ones.

Distribution

From southern Japan to the South China Sea, in 250– 310 m.