†family Plectoceratidae Hyatt in Zittel 1900 (mollusk)
Cephalopoda - Barrandeocerida - Plectoceratidae
Parent taxon: Barrandeocerida according to R. E. Crick 1981
See also Frey 1995 and Teichert et al. 1964
Sister taxa: Barrandeoceratidae, Barrandoceratidae, Lechritrochoceratidae, Nephriticeratidae
Subtaxa: Plectoceras
Ecology: fast-moving nektobenthic carnivore
Distribution:
• Chazyan of United States (5: New York collections)
• Arenig of China (1)
• Ordovician of Canada (1: Nunavut), China (1), the United Kingdom (1), United States (12: Illinois, Iowa, Wisconsin, Kentucky, Minnesota, Tennessee, Virginia)
• Canadian of United States (1: Colorado)
Total: 22 collections including 27 occurrences