Amastra senilis
| Amastra senilis | |
|---|---|
| |
| Shell of Amastra senilis | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Stylommatophora |
| Family: | Amastridae |
| Genus: | Amastra |
| Species: | A. senilis
|
| Binomial name | |
| Amastra senilis Baldwin, 1903
| |
| Synonyms | |
|
Amastra (Amastrella) senilis Baldwin, 1903 alternative representation | |
Amastra senilis is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.[1]
Description
[edit]The length of the shell attains 21.2 mm, its diameter 16 mm
The shell is openly umbilicate and broadly conic, with a thin yet delicate structure. The spire is conic, featuring nearly straight outlines and a subacute apex. The shell contains 6¾ whorls. The whorls of the protoconch are finely and sharply striate, closely packed, and well-defined.
The subsequent whorls are moderately convex, prominently marked with rough growth wrinkles. The last three whorls occasionally display small, very shallow spiral striations. The body whorl is carinate at the periphery in front and exhibits coarse malleation, resulting in irregular, spiral, descending ridges interspersed with flattened facets.
The columella is prominently dilated at the upper end, vertically oriented, and adorned with a small fold. The umbilicus is cylindrical, deep, and measures approximately 2 mm in width, adding a notable feature to the shell's structure. [2]
Distribution
[edit]This species is endemic to Hawaii, occurring on the Mauna Kea volcano.
References
[edit]- ^ Amastra senilisBaldwin, 1903. 19 December 2024. Retrieved through: World Register of Marine Species.
- ^ Hyatt, A. & Pilsbry, H. A. (1910–1911). Manual of conchology, structural and systematic, with illustrations of the species. Ser. 2, Pulmonata. Vol. 21: Achatinellidae (Amastrinae). Philadelphia: Conchological Department, Academy of Natural Sciences. p. 312. Retrieved 3 December 2024.
{{cite book}}: CS1 maint: multiple names: authors list (link)
This article incorporates text from this source, which is in the public domain.
- Cowie, R. H., Evenhuis, N. L. & Christensen, C. C. (1995). Catalog of the native land and freshwater molluscs of the Hawaiian Islands. Leiden: Backhuys Publishers. p. 106.
{{cite book}}: CS1 maint: multiple names: authors list (link)
External links
[edit]- Baldwin, D.D. (1903). "Descriptions of new species of Achatinellidae from the Hawaiian Islands". The Nautilus. 17 (3): 35. Retrieved 19 December 2024.