Bivalvia - Protobranchia - Nuculanidae
Alternative spelling: Phestia (Polidevcia)
Parent taxon: Nuculanidae according to H. E. Vokes 1980
Sister taxa: Acilana, Acutispinula, Australoportlandia, Bathyspinula, Bathyspinulinae, Calorhadia, Costelloleda, Dacromya, Ezonuculana, Glyptoleda, Hilgardia, Indonuculana, Ledella, Ledellinae, Ledoides, Lembulus, Litorhadia, Mesosaccella, Multidentata, Nuculaninae, Nucundata, Orthoyoldia, Parayoldiella, Phestia, Phestiinae, Poroleda, Poroledidae, Praeportlandia, Propeleda, Saccella, Scissuladrana, Spineilo, Xiaoschuiculana, Zealeda
Subtaxa: Polidevcia abrupta, Polidevcia aequilata, Polidevcia antequadrata, Polidevcia arctura, Polidevcia bellistriata, Polidevcia bicarinata, Polidevcia browni, Polidevcia cryptica, Polidevcia flexuosa, Polidevcia jamesi, Polidevcia kasanensis, Polidevcia kolyvanica, Polidevcia lunulata, Polidevcia lyonsensis, Polidevcia magna, Polidevcia nodulosa, Polidevcia obesa, Polidevcia ovata, Polidevcia stevensiana, Polidevcia thomasi, Polidevcia tulcumbensis, Polidevcia undosa, Polidevcia vorgaschorica, Polidevcia zabaikalica
Ecology: facultatively mobile infaunal deposit feeder-suspension feeder