| Amastra sykesi | |
|---|---|
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| Shell of Amastra sykesi (holotype) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Stylommatophora |
| Family: | Amastridae |
| Genus: | Amastra |
| Species: | A. sykesi |
| Binomial name | |
| Amastra sykesi Hyatt & Pilsbry, 1911 | |
| Synonyms | |
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Amastra (Amastra) sykesi Hyatt & Pilsbry, 1911 alternative representation | |
Amastra sykesi is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Description
The length of the shell attains 11 mm, its diameter 7.5 mm.
(Original description) The shell contains 5½ whorls. The shell is subrimate, globose-conic, and thin, with a dull, non-shiny surface. After the smooth initial half-whorl, it transitions into a flat, strongly costate whorl, featuring a carina that is partially concealed within the suture. The next whorl is costulate only near the suture, with its lower portion smooth.
The following whorls are weakly convex, finely marked with growth wrinkles that become slightly more pronounced on the globose body whorl. The coloration varies: the shell may be fleshy-ochraceous with faint angular brown markings on the penultimate whorl, while the body whorl lacks an outer cuticle; alternatively, it may be a pale, faintly yellow-tinted white with a brownish apex, and the last two whorls partially covered by an extremely thin cuticle adorned with zigzag olive-brown streaks.
The aperture is pinkish in the first color form and white in the second. The outer lip is narrowly rimmed within. The columellar lamella projects in a triangular shape.
Distribution
This species is endemic to Hawaii, occurring on Molokai Island.
References
- Amastra sykesi Hyatt & Pilsbry, 1911. 5 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. 273. 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. vi. Leiden: Backhuys Publishers. p. 107.
{{cite book}}: CS1 maint: multiple names: authors list (link)
| Taxon identifiers | |
|---|---|
| Amastra sykesi | |