Amastra sinistrorsa

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Amastra sinistrorsa
Amastra sinistrorsa 001.jpg
Shell of Amastra sinistrorsa
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Stylommatophora
Family: Amastridae
Genus: Amastra
Species:
A. sinistrorsa
Binomial name
Amastra sinistrorsa
Baldwin, 1906
Synonyms

Amastra (Heteramastra) sinistrorsaBaldwin, 1896 alternative representation

Contents

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

Description

The length of the shell attains 14.7 mm, its diameter 6.2 mm

The shell contains 6½ whorls. It is imperforate, sinistral, and lanceolate and has a relatively thin structure. The spire is elongated, featuring straight outlines. The first half-whorl is smooth and convex, forming an obtuse apex. The following whorl is flattened and subacutely carinate near the base, adorned with fine, curved riblets. On subsequent whorls, the carina diminishes and eventually disappears, while the riblets become finer and more closely spaced. The later whorls are moderately convex, displaying rather coarse growth wrinkles and lacking angularity above the impressed suture.

The aperture is strongly oblique, with a thin outer lip. The columella is straight, its edge narrowly reflexed and adnate above, bearing a small, very oblique fold. [2]

Distribution

This species is endemic to Hawaii, occurring on the main island at Hamakua.

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References

  1. ↑ Amastra sinistrorsaBaldwin, 1906 . 7 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. 240. Retrieved 3 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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