Somatogyrus crassilabris Walker, 1915

Thicklipped pebblesnail, Thick-lipped pebblesnail



Taxonomy & Nomenclature



Conservation Status


Last record: 1915 (Cordeiro & Perez, 2011)

IUCN RedList status: Extinct



White River, Arkansas, USA


Biology & Ecology










Original scientific description:

Walker, B. (1915). Apical characters in Somatogyrus with descriptions of three new species. The Nautilus 29(4 & 5): 37-41, 49-53.


Other references:

Cordeiro, J. and Perez, K. (2011a). Somatogyrus crassilabris. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1. ( Downloaded on 27 July 2013.

Cordeiro, J. & Perez, K. 2011b. Somatogyrus crassilabris. The IUCN Red List of Threatened Species 2011: e.T20355A9190667. Accessed on 18 June 2022.

Cowie, Robert H., Régnier, Claire, Fontaine, Benoît, and Bouchet, Philippe. (2017). Measuring the Sixth Extinction: what do mollusks tell us? The Nautilus 131(1): 3-41.

Hinkley, A.A. 1915. New fresh-water shells from the ozark mountains. Proceedings of the National Museum 49: 587-589.

Johnson, P.D., A.E. Bogan, K.M. Brown, N.M. Burkhead,J.R. Cordeiro, J.T. Garner, P.D. Hartfield, D.A.W.Lepitzki, G.L. Mackie, E. Pip, T.A. Tarpley, J.S. Tiemann,N.V. Whelan and E.S. Strong. 2013. Conservation status offreshwater gastropods of Canada and the United States.Fisheries 38: 247–282.

Régnier, Claire, Fontaine, Benoît and Bouchet, Philippe. (2009). Not Knowing, Not Recording, Not Listing: Numerous Unnoticed Mollusk Extinctions. Conservation Biology 23(5): 1214-1221.

Robison, H. W. and Allen, R. T. (1995). Only in Arkansas: A Study of the Endemic Plants and Animals of the State. pp. 36. University of Arkansas Press, Fayetteville, Arkansas.

Walker, B. (1918). A synopsis of the classification of the fresh-water mollusca of North America, North of Mexico. Museum of Zoology.


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