Athearnia crassa
Species of gastropod
From Wikipedia, the free encyclopedia
Athearnia crassa, the boulder snail, was a species of freshwater snail in the family Pleuroceridae.[3]
| Athearnia crassa | |
|---|---|
| |
| Shell of Athearnia crassa (specimen at the Smithsonian Institution) | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | incertae sedis |
| Family: | Pleuroceridae |
| Genus: | Athearnia |
| Species: | †A. crassa |
| Binomial name | |
| †Athearnia crassa (Haldeman, 1841) | |
| Synonyms | |
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Description
(Original description) The shell is either conical or globose in shape and possesses a ponderous structure. It consists of five whorls, which are either flat or slightly convex. The spire is notably exserted, and the aperture is ovate, featuring a well-marked columellar notch. The outer lip is thick, and the overall color of the shell is brown.
The specimen typically reaches a length of 3 inches (76.2 mm) and its habitat is the Clinch River in Tennessee. This species differs from Anculosa praerosa (Say, 1821) (synonym of Leptoxis praerosa (Say, 1821) by its more highly developed spire and its more distinct notch.[4]
