Amastra thaamuni

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Amastra thaamuni
Amastra thaamuni 001.jpg
Shell of Amastra thaamuni (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. thaamuni
Binomial name
Amastra thaamuni
Hyatt & Pilsbry, 1911
Synonyms

Amastra (Metamastra) thaamuniHyatt & Pilsbry, 1911 alternative representation

Contents

Amastra thaamuni 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 14.98 mm, its diameter 9.5 mm.

(Original description) The shell contains 6 whorls. The shell is sinistral, imperforate, and moderately solid, with an oblong shape and a somewhat silky luster. The spire is broadly conic with slightly convex outlines and a relatively obtuse summit.

The whorls of the protoconch are marked only by faint, very fine growth striae, while the later whorls exhibit distinct, oblique striation with fine, thread-like ridges. The upper whorls are purplish-brown with irregular whitish streaks, and the last two whorls are covered by a rich, dark chestnut cuticle. This cuticle is yellowish near the suture and becomes deciduous in front of the aperture, revealing a glossy, light green underlayer beneath.

The aperture is moderately oblique, with a livid or bluish-white interior. A whitish callous rim lines the interior of the dark-edged lip. The columella is short and bears a strong, triangular lamella that bends downward. The parietal callus is thin. [2]

Distribution

This species is endemic to Hawaii, occurring on Oahu Island.

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References

  1. ↑ Amastra thaamuni Hyatt & Pilsbry, 1911 . 5 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. 177. 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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