Suborder Hypsidoroidei (catfish)
Parent taxon: Siluriformes according to J. S. Nelson et al. 2016
Sister taxa: Andinichthyidae, Bachmanniidae, Callitrichtyidae, Cetopsoidei, Diplomystoidei, Doradidae, Eopeyeria, Loricaroidei, Selenaspis, Siluroidei
Subtaxa: Hypsidoridae
Ecology: nektobenthic carnivore
Distribution: found only at Horse Heaven Mine (Eocene of Oregon)