Balea perversa
| Balea perversa | |
|---|---|
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| live Balea perversa | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| (unranked): |
clade Heterobranchia
clade Euthyneura |
| Superfamily: | Clausilioidea |
| Family: | Clausiliidae |
| Subfamily: | Baleinae |
| Genus: | Balea |
| Species: | B. perversa |
| Binomial name | |
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Balea perversa (Linnaeus, 1758) |
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| Synonyms | |
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clade Euthyneura
clade Panpulmonata
clade Eupulmonata
clade Stylommatophora
informal group Sigmurethra
Balea perversa is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Clausiliidae, the door snails. The shell of this species is left-handed in coiling and it looks like a juvenile of a clausiliid.
Balea perversa (as its synonymous name Pupa fragilis) is the type species of the genus Balea.
The distribution of this species is from Western Europe to Crimea:
It was referred from Crimea, but it was probably Mentissa gracilicosta.
The shell is small and resembles that of a juvenile clausilid. The color is pale brownish and the surface is often silky shiny. The shell often has distinct riblets. The apical whorls are cylindrical. The shell has 8-9 whorls and (unlike many clausiliids) the last whorl has the largest diameter. It is densely ribbed. The cervix is almost without keel. Apart from a rudimentary parietal fold, there are no folds in the aperture. This species has no clausilium.
The width of the shell is 2.5-2.7 mm; the height of the shell is 7-10 mm.
Balea perversa differs from Balea heydeni in that it is a less slender and brownish rather than yellowish shell; the first whorl increases in diameter less rapidly, and the sculpture is more prominently striated (with what are usually distinct riblets rather than coarse growth lines).
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Wikipedia