Amalda hinomotoensis ( Yokoyama, 1922 )

Kantor, Yuri I., Castelin, Magalie, Fedosov, Alexander & Bouchet, Philippe, 2020, The Indo-Pacific Amalda (Neogastropoda, Olivoidea, Ancillariidae) revisited with molecular data, with special emphasis on New Caledonia, European Journal of Taxonomy 706, pp. 1-59 : 50

Amalda hinomotoensis ( Yokoyama, 1922)

Figs 19 H–I, 20J–K

Ancilla hinomotoensis Yokoyama, 1922: 48 , pl. 2 fig. 5.

Ancilla hinomotoensis – Taki & Oyama 1954: pl. 22 figs 5–5a.

Baryspira urasima Is. Taki ms – Kira 1959: 63, pl. 31 fig. 3.

Amalda hinomotoensis – Tsuchida 2017: 332, pl. 288 fig. 5, 996. — Gratecap 2016b: 5, 13, figs 11–13. Amalda urasima – Okutani 2000: 523, pl. 260 fig. 5.

Type material

Lectotype

JAPAN • lectotype of Ancilla hinomotoensis (designated by Taki & Oyama 1954); Pliocene of Shito ; UMUT 20840 .

Material examined

Two sequenced specimens ( Table 1).

Description

MEASUREMENTS. Shell medium in size (SL exceeding 41 mm).

SHELL. Narrow to ovate-fusiform, with a weakly cyrtoconoid spire. Primary spire callus thick, microshagreened, covering all whorls except protoconch tip, rendering measurements impossible. Secondary callus thick, strongly microshagreened and mat, fusing without visible border with parietal callus, with distinct anterior border and nearly reaching shell tip. Plication plate with up to 5 ridges subdivided by grooves, or nearly smooth, columella smooth. Olivoid groove shallow to very shallow, labral denticle very short, obtuse. Anterior band strongly microshagreened, upper anterior band very weakly convex, lower anterior band flat. Primary callus orange-brown in middle part, lighter abapically, bordered by very thin, light spiral line. Secondary callus white. Body whorl cloak light chestnut, olivoid band whitish, upper anterior band dark brown, lower anterior band creamy, plication plate white.

RADULA (n =1, Fig. 20 J–K). With hook-shaped lateral teeth with broad bases. Central tooth tricuspid with subequal, large, triangular, smooth cusps and medium broad lateral flaps.

Remarks

The name Baryspira urasima was introduced by Kira (1959) without description and despite its use by Okutani (2000), it remains an unavailable name (ICZN art. 13.1.1).

Distribution

Japan, from Sagami Bay to Kyushu, in 200–350 m ( Tsuchida 2017).

Figures

Fig. 19. Sequenced species of Amalda H. Adams & A. Adams, 1853. A–B. Amalda sp., MNHN IM- 2013-63891, SL 20 mm. C–D. A. contusa (Reeve, 1864), MNHN IM-2009-22263, SL 24.9 mm. E. A. optima (G.B. Sowerby III, 1897), MNHN IM-2007-38287. F–G. A. monilifera (Reeve, 1864), MNHN IM-2013-63898, SL 11.7 mm. H–I. A. hinomotoensis (Yokoyama, 1922), MNHN IM-2019-618, SL41.4 mm.J–K.A.hayashii Ninomiya, 1988, MNHNIM-2013-44413,SL38.4 mm.L–M.A.bellonarum Kilburn & Bouchet, 1988, MNHN IM-2007-33273. Shells not to scale.

Fig. 20. Radulae of species of Amalda H. Adams & A. Adams, 1853. A. Amalda sp., MNHN IM-2013- 63891 (shell on Fig. 19A–B). B, E. A. monilifera (Reeve, 1864), MNHN IM-2013-63898 (shell on Fig. 19F–G). C–D. A. contusa, MNHN IM-2009-22264, SL 22.7 mm. F–I. A. hayashii Ninomiya, 1988. F–G. MNHN IM-2013-44413 (shell on Fig. 19J–K). H. MNHN IM-2013-44432. I. MNHN IM-2013- 44457, SL 38.2 mm. J–K. A. hinomotoensis (Yokoyama, 1922), MNHN IM-2019-619, SL 38.5 mm.