| Amastra vetusta | |
|---|---|
 | |
| Shell of Amastra vetusta | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Stylommatophora |
| Family: | Amastridae |
| Genus: | Amastra |
| Species: | A. vetusta |
| Binomial name | |
| Amastra vetusta (Baldwin, 1895) | |
| Synonyms | |
| |
Amastra vetusta is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae. [1]
The length of the shell attains 13 mm, its diameter 7.5 mm.
(Later supplemental description by Hyatt, A. & Pilsbry, H. A. ) The shell is minutely rimate, oblong-conic, and relatively thick and solid. Known exclusively from fossil specimens, it is whitish and lacks a cuticle. The spire is slightly conic, tapering toward a subacute apex. There are 6 1/3 whorls, which are only slightly convex.
The initial half-whorl is smooth, followed by two embryonic whorls finely sculptured with deeply engraved, slightly arched longitudinal striae. Subsequent whorls are more coarsely sculptured with prominent, closely spaced longitudinal wrinkles intersected by a few irregularly placed spiral lines, as if etched on a softer surface.
The aperture is small, ovate, and nearly vertical. The outer lip is thickened and obtuse, with a strong inner reinforcement. The columella bears a subhorizontal lamella that appears modest in a frontal view but is notably prominent in an oblique view of the aperture. The parietal callus is substantial, particularly at its margin.
Amastra vetusta exhibits the characteristic shell thickening and coarse sculpture commonly observed in land snails inhabiting arid environments with minimal shade or cover. [2]
This species is endemic to Hawaii, occurring on Oahu Island.
Amastra is a genus of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Amastridae.
Amastra pellucida is an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Amastridae.
Amastra porcus is an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Amastridae.
Amastra tenuispira is an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Amastridae.
Amastra baldwiniana is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra borcherdingi is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra hawaiiensis is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra johnsoni is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra makawaoensis is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra morticina is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra nubifera is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra subobscura is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra antiqua is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra badia is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra breviata is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra knudsenii is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra nana is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra undata is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra aurostoma is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra montana is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
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