Amastra thaamuni
| Amastra thaamuni | |
|---|---|
| |
| Shell of Amastra thaamuni (holotype) | |
Scientific classification 
| |
| 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) thaamuni Hyatt & Pilsbry, 1911 alternative representation | |
Amastra thaamuni is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.[1]
Description
[edit]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
[edit]This species is endemic to Hawaii, occurring on Oahu Island.
References
[edit]- ^ Amastra thaamuni Hyatt & Pilsbry, 1911. 5 December 2024. Retrieved through: World Register of Marine Species.
- ^ 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)
This article incorporates text from this source, which is in the public domain.
External links
[edit]- Cowie, R. H., Evenhuis, N. L. & Christensen, C. C. (1995). Catalog of the native land and freshwater molluscs of the Hawaiian Islands. vi. Leiden: Backhuys Publishers. p. 107.
{{cite book}}: CS1 maint: multiple names: authors list (link)
