Agamyxis
Acanthodoras spinosissimus, the Talking catfish, is a species of thorny catfish found in the Amazon and Essequibo River basins, occurring in the countries of Brazil, Colombia, Guyana and Peru. This species grows to a length of 13.7 centimetres (5.4 in) SL and can be found in the aquarium trade. This species is reported to produce toxic fluids.Doradids occur in most South American basins, though they are absent from the Pacific coast drainages and from coastal drainages south of the Río de la Plata. 70% of the valid species occur in the Amazon basin; the Orinoco basin harbors about 22 species and ranks second in species richness. On the other hand, only two species of doradids have been described from Brazilian eastern coastal basins: Wertheimeria maculata from the Jequitinhonha and Pardo rivers and Kalyptodoras bahiensis from the Paraguaçu River.
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