echthrus, Megalocentor de Pinna [M. C. C.] & Britski [H. A.] 1991:116, Figs. 3, 4 (a-b) [Ichthyological Exploration of Freshwaters v. 2 (no. 2); ref. 13595] Rio Madeira, Calama, Praia do Caraparu, Amazonas State, Brazil. Holotype: MZUSP 41879. Paratypes: AMNH 94438 [ex MZUSP 30387] (1); MZUSP 5897 (1), 23429 (1), 23543 (1), 26192 (4), 27824 (1), 30377-79 (2, 2, 1), 30380 (3, 1 c&s), 30381-86 (1, 1, 1, 2, 1, 1), 30388-90 (1, 1, 1), 30391 (2, 1 c&s), 30392-96 (1, 2, 1, 3, 1); USNM 316024 (1) Type catalog: Ferraris & Vari 1992:41 [ref. 19771], Ferraris 2007:409 [ref. 29155]. •Valid as Megalocentor echthrus de Pinna & Britski 1991 -- (Chang & Ortega 1995:4 [ref. 24302], Burgess & Finley 1996:168 [ref. 22901], de Pinna & Wosiacki in Reis et al. 2003:276 [ref. 27061], Ferraris 2007:409 [ref. 29155], Sarmiento et al. 2014:192 [ref. 35004], DoNascimiento 2015:945 [ref. 34078], DoNascimiento et al. 2017:71 [ref. 35633], Meza-Vargas et al. 2021:24 [ref. 39298], DoNacimiento in Lasso & Morales-Betancourt 2022:260 [ref. 40783]). Current status: Valid as Megalocentor echthrus de Pinna & Britski 1991. Trichomycteridae: Stegophilinae. Distribution: South America: Amazon and Orinoco River basins (Bolivia, Brazil, Colombia, Peru and Venezuela). Habitat: freshwater.