Alaginella geminata
| Alaginella geminata | |
|---|---|
| |
| Shell of Alaginella geminata (holotype) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Neogastropoda |
| Family: | Marginellidae |
| Genus: | Alaginella |
| Species: | A. geminata
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| Binomial name | |
| Alaginella geminata (Hedley, 1912)
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| Synonyms | |
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Alaginella geminata is a species of sea snail, a marine gastropod mollusk in the family Marginellidae, the margin snails.[1]
Description
[edit]The length of the shell attains 6 mm, its diameter 4 mm.
(Original description) The biconical shell is glossy, and solid, becoming opaque in maturity and thin and translucent in youth. Its color is uniformly white. It comprises four whorls that are flattened above the shoulder and contracted at the base. Upon maturity, the spire is covered with a callus sheet that obscures the sutures, while a thicker layer extends over the body whorl ahead of the aperture. The aperture is narrow, subrostrate anteriorly, and channeled posteriorly, ascending the previous whorl. The outer lip has a thick varix externally and approximately ten evenly spaced small denticles internally. The columella features four strong elevated folds, with the posterior fold being horizontal and situated about halfway along the aperture, and the anterior fold running into the margin of the subrostrate extremity.[2] [3]
Distribution
[edit]This marine species is endemic to Australia and occurs off New South Wales, Queensland, South Australia, Tasmania, Victoria and Western Australia[4]
References
[edit]- ^ Alaginella geminata (Hedley, 1912). 16 July 2024. Retrieved through: World Register of Marine Species.
- ^ Hedley, C. (1912). "Descriptions of some new or noteworthy shells in the Australian Museum". Records of the Australian Museum. 8 (3): 131–160. Retrieved 16 July 2024.
This article incorporates text from this source, which is in the public domain.
- ^ Alaginella geminata. "description + image". Seashells of New South Wales. Des Beechley.
- ^ "Alaginella geminata". Australian Faunal Directory. Australian Government. Retrieved 16 July 2024.
- Cossignani, T. (2006). Marginellidae & Cystiscidae of the World. L'Informatore Piceno. pp. 1–408.
- Wilson, B. (1994). Australian marine shells, Prosobranch, Gastropods (2 ed.). Kallaroo, Western Australia: Odyssey Publishing. pp. 1–370.
External links
[edit]- Cotton, B.C. (1944). "Australian Margin Shells (Marginellidae)". The South Australian Naturalist. 22 (4). Retrieved 16 July 2024.
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