Octonema Herzenstein [S. M.] in Herzenstein & Warpachowski 1888:47 Neut. Octonema pleskei Herzenstein 1888. Type by subsequent designation. Type designated by Berg 1907:437. Objectively invalid; preoccupied by Octonema Martens 1868 in fishes and Octonema Haecker 1879 in Coelenterata, replaced by Lefua Herzenstein 1888. Type designated by Berg 1907:437. •In the synonymy of Oreonectes Günther 1868 -- (Bănărescu & Nalbant 1995:453 [ref. 23187]). •In the synonymy of Lefua Herzenstein 1888 -- (Zhu 1989:20 [ref. 17744], Kottelat 1990:19 [ref. 14137], Bogutskaya & Naseka 2004:114 [ref. 28183], Kottelat 2012:87 [ref. 32367], Parin et al. 2014:103 [ref. 33547], Zhang et al. 2016:129 [ref. 34477]). 1°Homonym. Current status: Synonym of Lefua Herzenstein 1888. Nemacheilidae.