nijsseni, Corydoras elegans Sands [D. D.] 1989:45, Fig. [Practical Fishkeeping; ref. 20244] Tributary of the Rio Negro, Brazil. Syntypes: (several) RMNH 31625 and 31626 (4). Type catalog: Ferraris 2007:121 [ref. 29155]. See Isbrücker 2001:231 [ref. 26805] for figure correction. •Mention -- (Burgess & Finley 1996:168 [ref. 22901]). •Valid as Corydoras nijsseni Sands 1989 -- (Isbrücker 2001:231 [ref. 26805], Reis in Reis et al. 2003:300 [ref. 27061], Britto & Lima 2003:89 [ref. 27314], Shimabukuro-Dias et al. 2004:141 [ref. 27796] as cf. nijsseni, Ferraris 2007:121 [ref. 29155]). •Valid as Gastrodermus nijsseni -- (Dias et al. 2024:24 [ref. 41219]). Current status: Valid as Gastrodermus nijsseni (Sands 1989). Callichthyidae: Corydoradinae. Distribution: South America: Negro River basin, Brazil. Habitat: freshwater.