†family Bairdiidae Sars 1888 (ostracod)
Parent taxon: Bairdioidea according to S. Crasquin 2008
Sister taxa: Acratiidae, Geroiidae, Macrocyprididae, Microcheilinellidae, Pachydomellidae
Subtaxa: Abrobairdia, Acratina, Actuaria, Anisobairdia, Arcibairdia, Bairdia, Bairdiacypris, Bairdiolites, Bispinacratia, Bohlenatia, Ceratobairdia, Fabalicypris, Heterobairdia, Isobythocypris, Kempfina, Krausella, Lanczichebairdia, Lobobairdia, Mirabairdia, Orthobairdia, Parabairdiacypris, Paracypris, Paramacrocypris, Petasobairdia, Praelobobairdia, Praezabythocypris, Ptychobairdia, Pustulobairdia, Sinabairdia, Spinobairdia, Spinocypris, Truncobairdia, Urobairdia, Vanganardia, Xixionopsis
Ecology: epifaunal detritivore-grazer