Athearnia crassa, the boulder snail, was a species of freshwater snail in the family Pleuroceridae.
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 <small>(Say, 1821)</small> (synonym of Leptoxis praerosa <small>(Say, 1821)</small> by its more highly developed spire and its more distinct notch.
Distribution
It was native to the United States, where it was known from Alabama, Georgia, Tennessee, and Virginia. It is now extinct.
References
- Haldeman, S.S. (1847). G. Leptoxis, Leptoxe, Rafinesque. In: Illustrations conchyliologiques ou description et figures de toutes les coquilles connes vivantes et fossiles, classées suivant le système de Lamarck modifié dâÂÂaprès les progrès de la science, et comprenant les genres nouveaux et les espèces récemment découvertes. Part 73. Ed: Chenu, J.C. A. Franck, Paris. plates 2-3.
External links
- Haldeman, S. S. (1842). New species of shells. A monograph of the Limniades or freshwater univalve shells of North America. 4. J. Dobson, Philadelphia
- Lea, I. (1861). Descriptions of new species of Schizostoma, Anculosa and Lithasia. Proceedings of the Academy of Natural Sciences of Philadelphia. 13: 54-55
- Redfield, J.H. (1854). Descriptions of new species of shells; Annals of the Lyceum of Natural History of New York. 6: 130-132, plate 1
- Johnson, P. D.; Bogan, A. E.; Brown, K. M.; Burkhead, N. M.; Cordeiro, J. R.; Garner, J. T.; Hartfield, P. D.; Lepitzki, D. A. W.; Mackie, G. L.; Tarpley, T. A.; Tiemann, J. S.; Whelan, N. V.; Strong, E. E. (2013). Conservation status of freshwater gastropods of Canada and the United States. Fisheries. 38(6): 247-282