Reganella Eigenmann, 1905 ^ZBK.

Type species: Hemiodon depressus Kner, 1853 ^ZBK.

Lectotype: NMW 9438, Brazil, Rio Negro, Marabitanas .

Gender: feminine.

This monotypic genus is distributed in the middle Amazon River basin. Ecological and behavioral data are unavailable. The dorsoventrally flattened body suggests that Reganella ^ZBK inhabits flowing waters over sandy substrates. Reganella depressa is a poorly known species and uncommon in collections. Its phylogenetic position remains uncertain and relationship to other representatives of the Pseudohemiodon ^ZBK group is unclear.