Amalda hinomotoensis

Amalda hinomotoensis
Shell of Amalda hinomotoensis (specimen at MNHN, Paris)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Family: Ancillariidae
Genus: Amalda
Species:
A. hinomotoensis
Binomial name
Amalda hinomotoensis
(Yokoyama, 1922)[1]
Synonyms
  • Amalda urasima Okutani 2000
  • † Ancilla hinomotoensis Yokoyama, 1922 superseded combination
  • Baryspira urasimaKira, 1959 (unavailable name: no description)

Amalda hinomotoensis is a species of sea snail, a marine gastropod mollusk in the family Ancillariidae, the olives.[2]

Description

The length of the shell attains 41 mm.

The shell is narrow to ovate-fusiform, with a weakly cyrtoconoid spire. The primary spire callus is thick and micro-shagreened, covering all whorls except the tip of the protoconch, making accurate measurements impossible. The secondary callus is thick, strongly micro-shagreened, and matte, merging seamlessly with the parietal callus without a visible border, and nearly reaching the tip of the shell.

The plication plate has up to five ridges separated by grooves, or it may be nearly smooth, while the columella is smooth. The olivoid groove is shallow to very shallow, and the denticle of the outer lip is very short and obtuse. The anterior band is strongly micro-shagreened, with the upper anterior band being very weakly convex and the lower anterior band flat.

The primary callus is orange-brown in the middle, lighter toward the abapical end, and bordered by a very thin, light spiral line. The secondary callus is white. The body whorl cloak is light chestnut, the olivoid band is whitish, the upper anterior band is dark brown, the lower anterior band is creamy, and the plication plate is white. [3]

Distribution

The marine species occurs off Japan. Fossils of the lectotype ware found in Pliocene strata of Shito, Japan.

References

  1. ^ Yokoyama, M. (1922) Fossils from the Upper Musashino of Kazusa and Shimosa. Journal of the College of Science, Tokyo Imperial University, 44, 1–200, 17 pls.. World Register of Marine Species, Retrieved 28 April 2010.
  2. ^ Amalda hinomotoensis (Yokoyama, 1922). Retrieved through: World Register of Marine Species on 28 April 2010.
  3. ^ Yuri I. Kantor, Magalie Castelin, Alexander Fedosov, Philippe Bouchet (2020), The Indo-Pacific Amalda (Neogastropoda, Olivoidea, Ancillariidae) revisited with molecular data, with special emphasis on New Caledonia; European Journal of Taxonomy, [S.l.], n. 706, aug. 2020. ISSN 2118-9773  This article incorporates text from this source, which is available under the CC BY-SA 4.0 license.
  • Kira, T. (1959). Coloured illustrations of the shells of Japan. (2nd ed., first printing). Japan: Hoikusha. pp. 1–239.
  • Tsuchida E. (2017). Family Olivellidae. pp. 995–997, in: T. Okutani (ed.), Marine Mollusks in Japan, ed. 2. 2 vols. Tokai University Press. 1375 pp.

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