†family Protactinoceratidae Chen 1979 (mollusk)
Cephalopoda - Protactinoceratida - Protactinoceratidae
Parent taxon: Protactinocerida according to R. E. Crick 1981
Sister taxa: Benxioceras, Mastoceras
Subtaxa: Physalactinoceras Protactinoceras Sinoeremoceras Wanwanoceras
Ecology: fast-moving nektobenthic carnivore
Distribution: found only at Wan-wan-kou dolomite at Wan-wan-kou valley in the Niuhsintai basin ( of South Korea)