Ammocryptocharax is a genus of freshwater ray-finned fishes belonging to the family Crenuchidae, the South American darters. These fishes are found in South America.
Species Ammocryptocharax contains the following species: Ammocryptocharax elegans Weitzman & Kanazawa, 1976 Ammocryptocharax lateralis (C. H. Eigenmann, 1909) Ammocryptocharax minutus Buckup, 1993 Ammocryptocharax vintonae (Eigenmann, 1909)
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