| Amastra fossilis | |
|---|---|
 | |
| Shell of Amastra fossilis | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Stylommatophora |
| Family: | Amastridae |
| Genus: | Amastra |
| Species: | A. fossilis |
| Binomial name | |
| Amastra fossilis Baldwin, 1903 | |
| Synonyms | |
Amastra (Amastrella) fossilisBaldwin, 1903 alternative representation Contents | |
Amastra fossilis is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae. [1]
The length of the shell attains 18 mm, its diameter 9 mm
The species was originally described as a fossil. The shell is dextral, and minutely perforated, with a somewhat solid structure and an elongately conical form. The apex is relatively acute, and the surface is adorned with somewhat irregular growth lines. Under magnification, the whorls of the protoconch exhibit very delicate and regular sulcations. The original color of the living shell remains unknown.
The shell comprises 7 whorls, which are slightly convex. The aperture is oblique and ovate, with a simple and very thin peristome. The columellar margin is slightly expanded, partially covering the umbilicus. The columella terminates in a slender, flexuous, thread-like plait, adding a distinctive feature to the structure.
The shell differs from Amastra conica by being broader at the base and more turrited, closely resembling certain wider forms of Amastra turritella in overall contour. Additionally, some specimens exhibit a slightly malleated texture.
The whorls of the protoconch are worn, rendering their original sculpture indiscernible. The later whorls are moderately convex, marked with rather coarse growth wrinkles. In larger shells, the body whorl may show areas of irregular malleation. The columellar fold is small, oblique, and subtle, while the axial perforation is relatively large and open, contributing to the distinctiveness of the shell. [2]
This species is endemic to Hawaii, occurring on the Mauna Kea volcano.
Amastra tenuispira is an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Amastridae.
Amastra umbilicata was a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra abavus is an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra baldwiniana 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 perversa is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra sola is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra thaamuni 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 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 vetusta is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra laeva 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.
Amastra spaldingi is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra senilis is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
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