Hyperaulax ridleyi
| Hyperaulax ridleyi | |
|---|---|
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| Drawing of the apertural view of a shell of Hyperaulax ridleyi. | |
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| Drawing of the umibilical view of a shell of Hyperaulax ridleyi. | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| (unranked): |
clade Heterobranchia clade Euthyneura |
| Superfamily: | Orthalicoidea |
| Family: | Odontostomidae |
| Genus: | Hyperaulax |
| Species: | H. ridleyi |
| Binomial name | |
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Hyperaulax ridleyi (E. A. Smith, 1890) |
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| Synonyms | |
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Bulimulus (Hyperaulax) ridleyi |
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clade Euthyneura
clade Panpulmonata
clade Eupulmonata
clade Stylommatophora
informal group Sigmurethra
Bulimulus (Hyperaulax) ridleyi
Hyperaulax ridleyi is a species of tropical air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Odontostomidae.
Hyperaulax ridleyi is the type species of the genus Hyperaulax.
This species is native to, and its occurrence is restricted to, Fernando de Noronha, an island off the coast of Brazil. The snail was described in 1890 by Edgar Albert Smith, a zoologist with the British Museum. The type specimen is stored in the British Museum of Natural History.
The shell is umbilicated, ovate, conic above, moderately solid, brown with a buff line at the periphery, very delicately sculptured with lines of growth, and sometimes has low wrinkles and fine impressed spiral striae. The spire of the shell is conic. The apex is obtuse. The sculpture of the nepionic whorls (the whorls immediately following the embryonic whorls) has superficial vermiculate (worm-like) wrinkles. The shell has 5½ slightly convex whorls. The last whorl is a little descending and then slightly ascending in front, distinctly constricted behind the peristome. The base of the shell is perforated by a deep and conspicuous, though not wide, umbilicus.
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