errans, Achirus Miranda Ribeiro [A. de] 1915:Heterostoma p. 23 [Arquivos do Museu Nacional de Rio de Janeiro v. 17; ref. 3711] Rio Jauru and Rio Paraguay. Syntypes: (2). On p. 661 when continuously paginated. •Species inquirenda in Achirus -- (Ramos in Reis et al. 2003:667 [ref. 27061]). •Synonym of Catathyridium jenynsii (Günther 1862) -- (Britski et al. 1999:154 [ref. 24147], Litz & Koerber 2014:36 [ref. 33622] with question, Mirande & Koerber 2015:59 [ref. 35117] with question, Koerber et al. 2017:82 [ref. 35267] with question). Current status: Synonym of Catathyridium jenynsii (Günther 1862). Achiridae. Habitat: freshwater.