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The first occurrence of the armored catfishes of the subfamily Callichthynae is reported in subterranean water bodies of northern and northeastern Brazil. The records include 3 species, each occurring in 1 of the 3 caves in the central and northeastern regions of Brazil:  Callichthys callichthys  from Casa do Caboclo cave, Sergipe state;  Hoplosternum littorale  from the Gruna da Lagoa do Meio, Bahia state; and  Megalechis thoracata , from Casa de Pedra cave, Tocantins state.

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First report of armored catfishes Callichthyinae Bonaparte, 1838 (Siluriformes: Callichthyidae) in the subterranean domain of northern and northeastern Brazil