| Amastra nana | |
|---|---|
 | |
| Shell of Amastra nana | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Stylommatophora |
| Family: | Amastridae |
| Genus: | Amastra |
| Species: | A. nana |
| Binomial name | |
| Amastra nana (Baldwin, 1895) | |
| Synonyms | |
| |
Amastra nana is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae. [1]
The length of the shell attains 11.5 mm, its diameter 6.5 mm.
(Original description) The shell contains 6½ whorls. When fully extended in motion, the animal is as long as its shell. The mantle is light brown, while the foot is brown on both the upper and lower surfaces, with darker spots along the sides. The tentacles and the anterior portion of the head are nearly black, providing a striking contrast. [2]
(Later supplemental description by Hyatt, A. & Pilsbry, H. A. ) The shell is rimate, ovate-conic, and thin, with an impure whitish or pale brown coloration. The apex is dark brown, and the surface, except near the aperture, is covered with a brown or olivaceous-brown cuticle adorned with light streaks or zigzag stripes.
The shell of the protoconch is distinctly costate and carinate, while the later whorls are sculpted with irregular wrinkle-like striations. The spire has nearly straight outlines, with the whorls being only slightly convex.
The aperture is relatively small, with the lip somewhat thickened on the interior. The columellar fold is sharp and well-defined. [3]
This species is endemic to Hawaii, occurring on Maui Island.
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 borcherdingi 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 nubifera is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra subcrassilabris is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra tricincta 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 pullata 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 aurostoma is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Amastra conica 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 rubristoma is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
This article incorporates text from this source, which is in the public domain .{{cite book}}: CS1 maint: multiple names: authors list (link) This article incorporates text from this source, which is in the public domain .