†Hilgardia Harris 1946 (pointed nut clam)
Bivalvia - Protobranchia - Nuculanidae
Alternative spelling: Nuculana (Hilgardia)
Parent taxon: Nuculanidae according to D. T. Dockery 1980
Sister taxa: Acilana, Acutispinula, Australoportlandia, Bathyspinula, Bathyspinulinae, Calorhadia, Costelloleda, Dacromya, Ezonuculana, Glyptoleda, Indonuculana, Ledella, Ledellinae, Ledoides, Lembulus, Litorhadia, Mesosaccella, Multidentata, Nuculaninae, Nucundata, Orthoyoldia, Parayoldiella, Phestia, Phestiinae, Polidevcia, Poroleda, Poroledidae, Praeportlandia, Propeleda, Saccella, Scissuladrana, Spineilo, Xiaoschuiculana, Zealeda
Subtaxa: Hilgardia multilineata, Hilgardia parkei, Nuculana (Hilgardia) multilineata
Ecology: facultatively mobile infaunal deposit feeder-suspension feeder