Amalda hayashii

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Amalda hayashii
Amalda hinomotoensis (MNHN-IM-2019-618).jpeg
Shell of Amalda hinomotoensis (specimen at MNHN, Paris)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Family: Ancillariidae
Genus: Amalda
Species:
A. hayashii
Binomial name
Amalda hayashii
Ninomiya, 1988
Synonyms

Amalda (Alocospira) hayashiiNinomiya, 1988 superseded combination

Contents

Amalda hayashii is a species of sea snail, a marine gastropod mollusk in the family Ancillariidae, the olives. [1]

Description

The 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

The marine species occurs off Amami-Oshima Island, Japan.

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References

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