Amalda hayashii is a species of sea snail, a marine gastropod mollusk in the family Ancillariidae, the olives.[1]
| Amalda hayashii | |
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| Shell of Amalda hinomotoensis (specimen at MNHN, Paris) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Neogastropoda |
| Family: | Ancillariidae |
| Genus: | Amalda |
| Species: | A. hayashii
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| Binomial name | |
| Amalda hayashii Ninomiya, 1988
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| Synonyms | |
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Amalda (Alocospira) hayashii Ninomiya, 1988 superseded combination | |
Description
editThe length of the shell attains 50 mm.
The shell is ovate-fusiform with a medium-high, weakly cyrtoconoid spire. The primary spire callus is thick and strongly pustulose, except on the smooth body whorl, covering all whorls except the protoconch tip, making measurements impossible. The secondary callus is relatively thin, with indistinct borders, micro-shagreened, and slightly glossy. It fuses seamlessly with the parietal callus and reaches the antepenultimate whorl, blending into the primary callus.
The plication plate ranges from nearly smooth to having up to five ridges, while the columella is either smooth or shows traces of plicae. The olivoid groove is shallow to very shallow, and the denticle of the outer lip is short, obtuse, and rounded. The anterior band is micro-shagreened, with the upper anterior band weakly convex and featuring an obtuse ridge either centrally located or shifted more abapically. The lower anterior band is flat.
The primary callus is yellow-brown on the spire and slightly darker toward the abapical region, bordered by an almost white, medium-width band. The secondary callus is whitish and translucent. The body whorl cloak is light chestnut with a slight purple tint, the olivoid band is whitish, the anterior band is brown, the lower anterior band is lighter, and the plication plate is creamy. [2]
Distribution
editThe marine species occurs off Amami-Oshima Island, Japan.
References
edit- ^ Amalda hayashii Ninomiya, 1988. 13 October 2024. Retrieved through: World Register of Marine Species.
- ^ 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
- 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.
External links
edit- Ninomiya, T. (1988). "A new subgenus and five new species of the Ancillinae (Gastropoda: Olividae) from southwestern Australia, Japan and Taiwan". Venus. 47 (3): 145.
Media related to Amalda hayashii at Wikimedia Commons