| Amastra forbesi | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Stylommatophora |
| Family: | Amastridae |
| Genus: | Amastra |
| Species: | †A. forbesi |
| Binomial name | |
| †Amastra forbesi C. M. Cooke, 1917 [2] | |
| Synonyms | |
Amastra (Metamastra) forbesiC. M. Cooke, 1917 · alternative representation Contents | |
Amastra forbesi is an extinct species of gastropod in the Amastridae family. [3]
The length of the shell attains 14.3 mm, its diameter 6.9 mm.
(Original description) The shell is imperforate, sinistral, elongate-conic, and thin, with a pure white coloration in its fossilized state. The spire's outlines are regularly and slightly convex, tapering to a rather sharp summit.
The whorls of the protoconch are slightly convex and indistinctly marked with minute striations. Subsequent whorls are also slightly convex, adorned with fine striations and delicate growth wrinkles. The body whorl is elongate, subcylindrical, and exhibits relatively coarse striations. It descends steeply near its base, forming a narrow, deeply curved area below the columellar fold.
The outer margin of the aperture is regularly curved and strengthened by a thick, prominent lip rib. The columella is short and broad, with a columellar fold that is moderately oblique and not particularly pronounced, tapering gradually just inside the columellar margin. [4]
This species was endemic to Hawai, occurring in Pleistocene strata on Maui Island.
Amastra subrostrata was an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra umbilicata was a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Tropidoptera heliciformis is a species of small, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Amastridae.
Amastra irwiniana is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra spaldingi is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra rugulosa is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra elephantina is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra flemingi is an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra fragosa is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra gouveii is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra juddii is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra montivaga is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra paulula is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra praeopima is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra ricei is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra spicula is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra thurstoni is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra viriosa is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra whitei is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra pilsbryi is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
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