singularis, Deuterodon Lucena [Z. M. S. de] & Lucena [C. A. S. de] 1992:141, Fig. 11 [Communicações do Museu de Ciências da PUCRS v. 5 (nos 1-12); ref. 21970] Rio Sanga de Areia, Gravatal, about 28°33'S, 49°06'W, Santa Catarina, Brazil. Holotype: MCP 14753. Paratypes: MCP 11004 (4), 11019 (3), 11026 (43), 11084 (85); MZUSP 43766 (2). Type catalog: Oyakawa 1996:465 [ref. 23140]. •Valid as Deuterodon singularis Lucena & Lucena 1992 -- (Lucena & Lucena 2002:129 [ref. 26205], Lucena et al. in Reis et al. 2003:127 [ref. 27061]). Current status: Valid as Deuterodon singularis Lucena & Lucena 1992. Acestrorhamphidae: Stygichthyinae. Distribution: Tubarão River basin and coastal drainages between its mouth and Da Madre River, Brazil. Habitat: freshwater.