Amastra hutchinsonii is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.[1]
| Amastra hutchinsonii | |
|---|---|
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| Shell of Amastra hutchinsonii | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Stylommatophora |
| Family: | Amastridae |
| Genus: | Amastra |
| Species: | A. hutchinsonii
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| Binomial name | |
| Amastra hutchinsonii (Pease, 1862)
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| Synonyms | |
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Description
editThe length of the shell attains 24.5 mm, its diameter 7.3 mm
The shell is acuminately turrited, sinistral, and imperforate. It consists of 7 whorls that are flatly convex, coarsely and irregularly striated longitudinally, without any marginations. The sutures are somewhat rough but well-impressed. The aperture is ovate, approximately two-fifths the length of the shell. The columellar fold is slight, oblique, and tortuous. The shell is covered with an earthy brown epidermis, with the apex being darker in color. The aperture and columella are white and shining.
In Mauian specimens, the shell is typically rimate, rarely imperforate as previously described by W.H. Pease. The embryonic whorls are exquisitely costellate, with the riblets following the usual curved pattern. The later whorls display a coarse sculpture of uneven wrinkles. These whorls are covered with a thin, rusty or chestnut cuticle, under which a light yellow under-layer is exposed by wear on the wrinkles, often covered with blackish dirt. Beneath the cuticle, the shell itself is white. The columellar lamella is small and strongly oblique. [2]
Distribution
editThis species is endemic to Hawaii, occurring on Maui island.
References
edit- ^ Amastra hutchinsonii (Pease, 1862). 21 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. 289. Retrieved 3 December 2024.
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This article incorporates text from this source, which is in the public domain.
External links
edit- Sykes, E.R. (1896). "Preliminary diagnoses of new species of non-marine Mollusca from the Hawaiian Islands. Part I". Proceedings of the Malacological Society of London. 2: 129. Retrieved 21 December 2024.
- Pease, W.H. (1862). "Descriptions of two new species of Helicter (Achatinella, Swains.), from the Sandwich Islands, with a history of the genus". Proceedings of the Zoological Society of London. 1862: 7. Retrieved 21 December 2024.