| Anguispira holroydensis | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Stylommatophora |
| Family: | Discidae |
| Genus: | Anguispira |
| Species: | A. holroydensis |
| Binomial name | |
| Anguispira holroydensis Russell, 1956 | |
Anguispira holroydensis was a species of pulmonate land snail in the family Discidae, the disk snails. The species is only known from fossilized specimens. It was first described by Loris S. Russell in 1956.
Fossils
The most well-studied A. holroydensis fossil was found in the North Park Formation in Carbon County, Wyoming. The shell's position in the formation dates it to the Late Miocene.
Physical appearance
Russell describes the A. holroydensis fossil as being visually similar to Anguispira cumberlandiana and Anguispira alternata. The shell is small, only 7.9 mm in diameter, with a low spire and deep umbilicus. The surface of the first one and a half whorls is smooth, with the remainder being marked by fine retractive ridges (costulae).
References
- ^ Russell, L.S. (1956). Nonmarine Mollusca from the North Park Formation of Saratoga Valley, Wyoming. Journal of Paleontology. 30(5): 1260-1263.
| Taxon identifiers | |
|---|---|
| Anguispira holroydensis | |
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