Grotto sculpin

The grotto sculpin ' is a species of freshwater ray-finned fish belonging to the family Cottidae, the typical sculpins. It is found in the United States where it only inhabits the Bois [Brule Creek (Cinque Hommes Creek)|Bois Brule] drainage in Perry County of southeastern Missouri. It reaches a maximum standard length of. This cavefish lives in underground streams and their resurgences. It was formerly confused with the more widespread C. carolinae, but can be separated by its smaller eyes and various degrees of reduced pigmentation. It is one of only three known cases of troglomorphism in the sculpin family, the others also involving U.S. Cottus.