During an investigation of the diatom flora of Mammoth Cave, Kentucky three Cymbella species were noted which could not be identified with any yet described forms. This paper contains a taxonomic description of the three new species: Cymbella clausii, Cymbella gerloffii, Cymbella hohnii. A common feature of all three species is the rather broad central area which may have been the result of a special adaptation to the cave environment.
Van Landingham, Sam L..
Three new species of Cymbella from Mammoth Cave, Kentucky.
International Journal of Speleology,
Available at: https://scholarcommons.usf.edu/ijs/vol2/iss1/11