spinosissimus, Doras Eigenmann [C. H.] & Eigenmann [R. S.] 1888:161 [Proceedings of the California Academy of Sciences (Series 2) v. 1 (pt 2); ref. 1249] Lago do Coari on Rio Solimões at Coari [Coary], Amazonas, Brazil. Holotype (unique): MCZ 7222. Type catalog: Ferraris 2007:168 [ref. 29155]. •Possibly a synonym of Acanthodoras polygramma (Kner 1853) -- (Sabaj & Mariangeles 2021:30 [ref. 38877] as polygrammus). •Valid as Acanthodoras spinosissimus (Eigenmann & Eigenmann 1888) -- (Burgess 1989:223 [ref. 12860], Lasso et al. 2001:98 [ref. 25928], Sabaj & Ferraris in Reis et al. 2003:458 [ref. 27061], Ferraris 2007:168 [ref. 29155], Barriga Salazar 2014:115 [ref. 35745], Sarmiento et al. 2014:190 [ref. 35004], DoNascimiento 2016:531 [ref. 34727], DoNascimiento et al. 2017:87 [ref. 35633], Meza-Vargas et al. 2021:22 [ref. 39298]). Current status: Uncertain as Acanthodoras spinosissimus (Eigenmann & Eigenmann 1888). Doradidae: Acanthodoradinae. Distribution: South America: Amazon and Essequibo River basins (Brazil, Ecuador, Bolivia, Colombia, Guyana and Peru); ?Venezuela. Habitat: freshwater.