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| ==Description== | ==Description== | ||
| The major diameter of the shell is |
The major diameter of the shell is O.68 mm and minor diameter O.5 mm. | ||
| (Original description) The thin, yet solidly constructed shell is extremely small, measuring less than 1 mm in diameter when fully grown. Fresh specimens are dark brown, while dead shells are ashy white. The shell features 16 regularly arranged white radial streaks along the periphery and is planorboid and biconcave, resembling the freshwater pulmonate snail ]. | (Original description) The thin, yet solidly constructed shell is extremely small, measuring less than 1 mm in diameter when fully grown. Fresh specimens are dark brown, while dead shells are ashy white. The shell features 16 regularly arranged white radial streaks along the periphery and is planorboid and biconcave, resembling the freshwater pulmonate snail ]. | ||
Revision as of 13:35, 21 January 2025
Species of gastropod
| Ammonicera japonica | |
|---|---|
| |
| Shell of Ammonicera japonica (holotype) | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Family: | Omalogyridae |
| Genus: | Ammonicera |
| Species: | A. japonica |
| Binomial name | |
| Ammonicera japonica Habe, 1972 | |
Ammonicera japonica is a species of minute sea snail, a marine gastropod mollusc in the family Omalogyridae.
Description
The major diameter of the shell is O.68 mm and minor diameter O.5 mm.
(Original description) The thin, yet solidly constructed shell is extremely small, measuring less than 1 mm in diameter when fully grown. Fresh specimens are dark brown, while dead shells are ashy white. The shell features 16 regularly arranged white radial streaks along the periphery and is planorboid and biconcave, resembling the freshwater pulmonate snail Gyraulus.
There are 3 to 3½ whorls, marked by deep sutures and constricted by regularly spaced annulations, with approximately 16 annulations present on the body whorl. The peripheral area is smooth, giving the shell an ammonite-like appearance. The aperture is circular, with a continuous peristome.
Distribution
This species occurs off Japan and Korea; also in the Indian Ocean off Réunion.
References
- Ammonicera japonica Habe, 1972. 21 January 2025. Retrieved through: World Register of Marine Species.
- Habe, T. (1972). "The Japan's smallest gastropod, Ammonicera japonica, sp. nov". Venus. 31 (3): 15–116. Retrieved 21 January 2025.
This article incorporates text from this source, which is under a CC BY 4.0 license.
- Raines, B.K. (2007). "New molluscan records from Easter Island, with the description of a new Ethminolia". Visaya. 2 (1): 70–88.
| Taxon identifiers | |
|---|---|
| Ammonicera japonica | |