Texadina sphinctostoma, commonly known as the narrowmouth hydrobe, is a species of very small aquatic snail, an operculate gastropod mollusc in the family Cochliopidae.
Distribution and habitat Texadina sphinctostoma is known from the brackish waters of eastern Mexico and from Alabama, Florida, Louisiana, Mississippi, and Texas in the United States. It occurs at depths of up to .Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. .
Description The maximum recorded shell length is 3.7 mm.
References
Rosenberg, G., F. Moretzsohn, and E. F. García. 2009. Gastropoda (Mollusca) of the Gulf of Mexico, Pp. 579–699 in Felder, D.L. and D.K. Camp (eds.), Gulf of Mexico–Origins, Waters, and Biota. Biodiversity. Texas A&M Press, College Station, Texas.