†family Pachydomellidae Berdan and Sohn 1961 (ostracod)
Synonym: Microcheilinellidae Gramm 1975
Parent taxon: Bairdioidea according to S. Crasquin and M. B. Forel 2010
Sister taxa: Acratiidae, Adamczakia, Aviacypris, Bairdiidae, Beecherellidae, Bythocyprididae, Gerodiidae, Macrocyprididae
Subtaxa: Ampuloides, Karinadomella, Microcheilinella, Newsomites, Punctacheilinella, Spinomicrocheilinella
Ecology: epifaunal detritivore-grazer