Geometric morphometrics throws light on evolution of the subterranean catfish Rhamdiopsis krugi (Teleostei: Siluriformes: Heptapteridae) in eastern Brazil - Bichuette, Maria Elina; Rantin, Bianca; Hingst-Zaher, Erika; Trajano, Eleonora (Biological Journal of the Linnean Society, 2014)