Amastra subrostrata
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| Amastra subrostrata | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Stylommatophora |
| Family: | Amastridae |
| Genus: | Amastra |
| Species: | †A. subrostrata |
| Binomial name | |
| †Amastra subrostrata | |
 | |
| Location of Oʻahu | |
| Synonyms | |
| |
Amastra subrostrata was an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.[3]
- Subspecies
- Amastra subrostrata acuminata C. M. Cooke, 1933
- Amastra subrostrata subrostrata (L. Pfeiffer, 1859)
The length of the shell attains 15 mm, its diameter 8 mm
The shell is imperforate, dextral, ovate-conic, and solid, with an irregularly striate surface that is slightly glossy. Its coloration is brown, irregularly clouded with tawny hues.
The spire is swollen-conic with a rather acute apex and consists of six whorls. The first four whorls are barely convex, while the body whorl is rounded and accounts for about two-fifths of the total length. A nearly basal, acute, and oblique columellar lamella is present.
The aperture is slightly oblique and irregularly semi-elliptical, angular at the columella, giving it a beak-like extension. The peristome is unexpanded and white-lipped within, with the right margin slightly spreading and the columellar margin only slightly dilated and adnate.[4]
