†family Tricornidae Blumenstengel 1965 (ostracod)
Parent taxon: Cytheroidea according to A. H. Yuan and S. Crasquin-Soleau 2007
Sister taxa: Berounellidae, Bythocytheridae, Cytherideidae, Cytherissinellidae, Limnocytheridae, Paracytherideidae, Protocytheridae, Cytheridae, Eucytheridae, Neocytherideidae, Trachyleberididae, Hemicytheridae, Loxoconchidae, Cytheruridae, Xestoleberididae, Glorianellidae, Pseudocytheridae
Subtaxa: Bohemina, Rectospinella
Ecology: epifaunal detritivore-grazer