Alvania filocincta is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.[1]
| Alvania filocincta | |
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| Shell of Alvania filocincta (holotype) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Superfamily: | Rissooidea |
| Family: | Rissoidae |
| Genus: | Alvania |
| Species: | A. filocincta
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| Binomial name | |
| Alvania filocincta (Hedley & Petterd, 1906)
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| Synonyms | |
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Description
editThe length of the shell attains 3 mm, its diameter 1.7 mm.
(Original description) The small shell is opaque and rather solid, broadly ovate and narrowly perforate. It contains five whorls, of which 1½ compose the protoconch. They are ventricose, the earlier whorls are angled above, the body whorl rounded,. The whorls are rapidly increasing, not descending at the aperture and sharply constricted at the sutures.
Sculpture : the protoconch is smooth. In adult shell the radials first predominate, then gradually grow denser and finer and then are at body whorl exceeded by the spirals. The body whorl carries twelve sharp, erect, wide spaced spirals, of which the upper are latticed by forty-two radial riblets proceeding from the suture and fading at the periphery. Twenty stronger radial ribs, whose interstices are traversed by five spirals, cross the penultimate whorl. The remaining whorl and a half has twenty-one coarse, wide set radials, with a spiral thread above and below. The aperture is perpendicular ovate, fortified by a thick -outstanding varix.[2]
Distribution
editThis marine species is endemic to Australia and occurs off New South Wales, South Australia, Tasmania and Victoria.
References
edit- ^ MolluscaBase eds. (2024). MolluscaBase. Alvania filocincta (Hedley & Petterd, 1906). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=594880 on 2024-01-23
- ^ Hedley, C.; Petterd, W. F. (1906). Mollusca from three hundred fathoms, off Sydney. Records of the Australian Museum. 6(3): 211-225
This article incorporates text from this source, which is in the public domain.
- Ponder, W.F. 1985. A review of the genera of the Rissoidae (Mollusca: Mesogastropoda: Rissoacea). Records of the Australian Museum suppl. 4: 1-221