Ancistomus is a genus of suckermouth armored catfishes found in shallow waters in rapidly flowing rivers in the southeastern Amazon basin in Brazil.
Species There are currently 5 recognized species in this genus: Ancistomus feldbergae Renildo Ribeiro de Oliveira, Lúcia Helena Rapp Py-Daniel, Jansen Alfredo, Sampaio Zuanon & Marcelo Salles Rocha, 2012 Ancistomus micrommatos Alexandre Rodrigues Cardoso & Paulo Henrique Franco Lucinda, 2003 Ancistomus snethlageae Franz Steindachner, 1911 Ancistomus spilomma Alexandre Rodrigues Cardoso & Paulo Henrique Franco Lucinda, 2003 Ancistomus spinosissimus Alexandre Rodrigues Cardoso & Paulo Henrique Franco Lucinda, 2003
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