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The northern cavefish or northern blindfish, Amblyopsis spelaea, is found in caves through Kentucky and southern Indiana. It is listed as a threatened species in the United States and the IUCN lists the species as vulnerable.
During a 2013 study of Amblyopsis spelaea, scientists found that the species was divided into two distinct evolutionary lineages: one north of the Ohio River, in Indiana, and one south of the river, in Kentucky. The southern population retained the name A. spelaea and the northern was re-designated Amblyopsis hoosieri in a 2014 paper published in the journal ZooKeys. Neither species is found north of the White River, flowing east to west south of Bedford, Indiana.
- Chakrabarty, Prosanta; Prejean, Jacques A.; Niemiller, Matthew L. (May 29, 2014). "The Hoosier cavefish, a new and endangered species (Amblyopsidae, Amblyopsis) from the caves of southern Indiana". ZooKeys (Pensoft) (412): 41–57. doi:10.3897/zookeys.412.7245. Retrieved January 23, 2015.
- Howard, Brian Clark (May 30, 2014). "Blind Hoosier Cavefish: Freshwater Species of the Week". National Geographic. Retrieved January 23, 2015.
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