†order Protactinoceratida Chen and Qi 1979 (mollusk)
Cephalopoda - Protactinoceratida
Alternative spelling: Protactinocerida
Parent taxon: Plectronoceratia according to A. H. King and D. H. Evans 2019
See also Crick 1981 and Sepkoski 2002
Sister taxon: Plectronoceratida
Subtaxa: Benxioceras Mastoceras Protactinoceratidae
Ecology: fast-moving nektobenthic carnivore
Distribution: found only at Wan-wan-kou dolomite at Wan-wan-kou valley in the Niuhsintai basin (Ordovician of South Korea)