†family Pianaridae Pchelintsev 1968 (snail)
Parent taxon: Cerithioidea according to W. F. Ponder and A. Warén 1988
Sister taxa: Acanthonematidae, Batillariidae, Brachytrematidae, Bullamirifica, Cassiopidae, Cerithiidae, Cryptaulacidae, Dialidae, Diastomatidae, Eustomatidae, Faxiidae, Ladinulidae, Lavigeriidae, Litiopidae, Maoraxidae, Melanopsidae, Metacerithiidae, Modulidae, Pachychilidae, Paludomidae, Planaxidae, Pleuroceridae, Popenellidae, Potamididae, Procerithiidae, Propupaspiridae, Prostyliferidae, Scaliolidae, Siliquariidae, Syrnolopsidae, Thiaridae, Tomaszoviella, Turritellidae
Subtaxa: none
Ecology: epifaunal grazer