Amastra abavus

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Amastra abavus
Amastra abavus 001.jpg
Shell of † Amastra abavus (holotype)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Stylommatophora
Family: Amastridae
Genus: Amastra
Species:
†A. abavus
Binomial name
†Amastra abavus
Hyatt & Pilsbry, 1911
Synonyms

† Amastra (Amastrella) abavusHyatt & Pilsbry, 1911 alternative representation

Contents

Amastra abavus is an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae. [1]

Description

The length of the shell attains 11 mm, its diameter 6 mm.

(Original description) The shell contains 5½ whorls. It is imperforate, ovate-conic, exceptionally thick and solid, with a somewhat glossy surface. As a fossil, it lacks a cuticle. The coloration exhibits two variations: (1) the first 2½ whorls are pale brown, followed by a half-whorl with brown bands on a white background, and the final 1½ whorls are opaque white; or (2) a pale brown shell with white bands beginning on the penultimate whorl and dominating the body whorl.

The spire's outlines are slightly convex at the base and straight above, with an obtuse apex. The whorls in the protoconch are convex and very finely striated, with the first whorl being nearly smooth. The subsequent whorls are weakly convex, marked by fine growth lines typical of the species.

The aperture is small, with a faint angularity at the base of the columella. The outer lip is significantly thickened internally, and the columellar margin is robust, supporting a small, nearly horizontal lamella. A thick parietal callus extends to the edge, contributing to the shell's solid and sturdy appearance. [2]

Distribution

This species is endemic to Hawaii and occurs on Molokai Island.

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References

  1. ↑ Amastra abavus Hyatt & Pilsbry, 1911 . 2 December 2024. Retrieved through: World Register of Marine Species .
  2. ↑ Hyatt, A. & Pilsbry, H. A. (1910–1911). Manual of conchology, structural and systematic, with illustrations of the species. Ser. 2, Pulmonata. Vol. 21: Achatinellidae (Amastrinae). Philadelphia: Conchological Department, Academy of Natural Sciences. p. 255. Retrieved 2 December 2024.{{cite book}}: CS1 maint: multiple names: authors list (link)PD-icon.svg This article incorporates text from this source, which is in the public domain .
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