The grotto sculpin is a species of fish in the family Cottidae. It is found in the United States where it only inhabits the Bois Brule drainage (although not recorded from the main stream itself) in Perry County of southeastern Missouri. It reaches a maximum standard length of 4.1 in. This cavefish lives in underground streams and their resurgences. It was formerly confused with the more widespread C. carolinae, but can be separated by among others 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 (C. bairdi—cognatus species complex in Pennsylvania, and C. carolinae in West Virginia)
This frog was found in January 2014 in cat track passage with Shelly Colatskieduring a bat count.
Macrocotyla glandulosa, or the pink planarian, is a flatworm found only Missouri Pink planarian are eyeless and de-pigmented flatworms that live on the undersides of rocks. It is currently a species of conservation concern in the state of Missouri.