Fontigens aldrichi, common name the Missouri amnicola, is a species of freshwater snail, an aquatic gastropod mollusk in the family Fontigentidae.[1]
Shell description
The shell is minute, imperforate, obliquely ovate, light brown. The surface of the shell is smooth except for slight growth-lines. The shell is composed of 3½ very convex whorls separated by unusually deep sutures. The apex is obtuse and often eroded. The last whorl is shortly deflexed in front in adult specimens.[2]
The aperture is rotund-ovate, being slightly narrowed above, but not angular there. The aperture is not modified in form by the preceding whorl. The aperture is moderately oblique. The peristome is continuous, not closely appressed at the upper left side. The columellar margin is thick and calloused within.[2]
The width of the shell is 1.3 mm. The height of the shell is 1.7 mm. The height of aperture is 0.8 mm. The shell of Fontigens aldrichi is much smaller than Bythinella aldrichi Call, shorter, with a thick and heavy columellar lip.[2]
Distribution
Type locality is Carter County, Missouri.
References
This article incorporates public domain text from reference.[2]
- ^ Fontigens aldrichi (Call & Beecher, 1886). 22 January 2025. Retrieved through: World Register of Marine Species.
- ^ a b c d Pilsbry, H.A. (1898). "Notes on new and little-known Amnicolidae". The Nautilus. 12 (4): 43. Retrieved 22 January 2025.
- Call, R. E. & Beecher, C. E. (1886). "Description of a new rissoid mollusk". Bulletin of the Washburn College Laboratory of Natural History. 1: 190–192.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - Hershler, R., Holsinger, J.R. & Hubricht, L. (1990). "A Revision of the North American Freshwater Snail Genus Fontigens (Prosobranchia: Hydrobiidae)". Smithsonian Contributions to Zoology. 509 (Washington).
{{cite journal}}: CS1 maint: multiple names: authors list (link)
External links
- Hubricht, L. (1940). "The Ozark Amnicolas". The Nautilus. 53 (4): 119–120.
- 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.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - Hubricht, L., L. (1976). "The genus Fontigens from Appalachian caves (Hydrobiidae: Mesogastropoda)". The Nautilus. 90 (2): 87.
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