†family Gouldoceratidae Stait 1984 (mollusk)
Parent taxon: Actinocerida according to A. Pohle et al. 2022
Sister taxa: Actinoceratidae, Armenoceratidae, Astoceras, Calhounoceras, Carbactinoceratidae, Eldroceras, Georginidae, Gonioceratidae, Greenlandoceratidae, Hopeioceras, Huroniidae, Jeholoceras, Kobayashiceras, Meitanoceratidae, Ormoceratidae, Parahelenites, Parahelenitidae, Polydesmiidae, Pseudactinoceratidae, Ruedemannoceratidae, Subtofangoceras, Wutinoceratidae, Zerashanoceras
Subtaxa: none
Ecology: nektobenthic carnivore
Distribution: found only at Florentine Valley (Ordovician of Australia)