Amphidromus perversus
| Amphidromus perversus | |
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| Abapertural and apertural view of the shell of Amphidromus perversus | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| (unranked): | clade Heterobranchia clade Euthyneura clade Panpulmonata clade Eupulmonata clade Stylommatophora informal group Sigmurethra |
| Superfamily: | Helicoidea |
| Family: | Camaenidae |
| Subfamily: | Camaeninae |
| Genus: | Amphidromus |
| Subgenus: | Amphidromus |
| Species: | A. perversus |
| Binomial name | |
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Amphidromus perversus (Linnaeus, 1758) |
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Amphidromus perversus is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Camaenidae.
Amphidromus perversus is the type species of the genus Amphidromus, by the subsequent designation of Eduard von Martens (1860).
There are six subspecies of Amphidromus perversus:
Distribution of Amphidromus perversus include Sumatra and Java to Borneo, Sulawesi and Bali.
Absent from the Mentawi Chain and Panaitan Island. Its occurrence on Sumbawa needs confirmation. Probably it has been introduced into Singapore. Subspecies recognized here are from Great Natuna, Bawean, Kangean Islands and Riau Islands.
Amphidromus perversus are amphidromine (left-handed and right-handed snails occur in the population).
In Amphidromus perversus and most other thick-shelled Amphidromus species, the lip is internally thickened, forms a "roll" in its expansion, and has a very heavy parietal callus.
The shell is solid, polished, amphidromine, moderately large (45–55 mm) high, usually with a dark varix. Lip and callus white; ground color white, orange, yellow, or yellowish-green. Many specimens with interrupted or continuous radial brownish streaks covering part or all of the whorls on the lower spire and body whorl.
Amphidromus perversus undoubtedly offers the greatest array of discretely variable color combinations of any species of Amphidromus.
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