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Typhlichthys subterraneus
''Typhlichthys subterraneus'' is a species of fish in the Amblyopsidae family endemic to karst regions of the eastern United States.
==Taxonomy==
''T. subterraneus'' is a member of the family Amblyopsidae, and is one of four troglobitic species. The southern cavefish was described by Charles Frédéric Girard in 1859 from a well near Bowling Green, Warren County, Kentucky. Later, Eigenmann in 1905 described both ''T. osborni'' and ''T. wyandotte'' based on differences in head width and eye diameter. ''Typhlichthys osborni'' was described from Horse Cave, Kentucky, whereas ''T. wyandotte'' was described from a well near Corydon, Indiana, that was later destroyed. Recently, a well-like entrance into a cave on the property of a car dealership in Corydon was discovered and is believed to represent the type locality. Regardless, this species is generally considered invalid and was not listed as a locality by Woods and Inger (1957). Recent surveys in the vicinity of Corydon have failed to document ''T. subterraneus'', finding only ''Amblyopsis spelaea''. ''Typhlichthys eigenmanni'' (''nomen nudum'') was described as a fourth species in the genus from Camden County, Missouri. Recently, Parenti proposed that ''T. eigenmanni'' Charlton, 1933 is a subjective synonym of ''T. subterraneus''. Woods and Inger (1957) synonymized all species under ''T. subterraneus'' on the basis of lack of any clear geographic pattern in morphological variation.〔 A population from Sloans Valley Cave, Pulaski County, Kentucky, differs in several ways from populations to the southwest in Tennessee along the Cumberland Plateau and might represent an undescribed species.
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