calvus, Isbrueckerichthys Jerep [F. C.], Shibatta [O. A.], Pereira [E. H. L.] & Oyakawa [O. T.] 2006:60, Fig. 2 [Zootaxa No. 1372; ref. 28877] Apucarana, rio Tibagi basin, córrego Juruba, 23°34'44.6"S, 51°33'12.6"W, Paraná State, Brazil. Holotype: MZUEL 3714. Paratypes: MCP 40207 (2), 40208 (2); MZUEL 3638 (5), 3715 (1), 3724 (9); MZUSP 90804 (3). •Valid as Isbrueckerichthys calvus Jerep, Shibatta, Pereira & Oyakawa 2006 -- (Ferraris 2007:441 [ref. 29155], Pereira et al. 2010:37 [ref. 30753], Pereira & Reis 2017:72 [ref. 35307], Reis et al. 2020:468 [ref. 38364]). Current status: Valid as Isbrueckerichthys calvus Jerep, Shibatta, Pereira & Oyakawa 2006. Loricariidae: Hypoptopomatinae. Distribution: South America: Tibagi River basin (Brazil). Habitat: freshwater.