Amaral (1935) described the new genus and species Calamodon paucidens based upon one specimen collected at 'vila Sao Simao', municipality of Cacequi (29" 53' S: 54" 49' W), state of Rio Grande do Sul (RS), Brazil. The name Calamodon was preoccupied, being replaced by Calamodontophys (AmaraI,1963).