Cephalopoda - Discosorida - Cyrtogomphoceratidae
Parent taxon: Discosorida according to B. Kröger and M. Aubrechtová 2019
See also Crick 1981, Kröger 2007, Kröger 2013 and Sweet 1958
Sister taxa: Aipetoceras, Akroceras, Anamesoceras, Asbestoceras, Brodekoceras, Carotites, Chuticeras, Comaroceras, Deiloceras, Discosoridae, Drakonoceras, Dynatoceras, Elpisoceras, Entimoceratidae, Exochoceras, Flowerites, Gouldoceras, Huanghuachangoceras, Hysteroceras, Kotelnyoceras, Lowoceratidae, Lymoceras, Mandaloceratidae, Manjoceras, Mesoceratidae, Metrioceras, Nipageroceras, Nucites, Paramecynoceras, Parawestonoceras, Parevlanoceras, Pelagoceras, Phragmoceratidae, Physioceras, Pseudobolloceras, Radoceras, Raphanites, Ropaloceras, Smileoceras, Spondeioceras, Strobiloceras, Synetoceras, Taoqupoceras, Taxyceras, Taxyceratidae, Therioceras, Ukhtoceras, Urtasymoceras, Westonoceratidae, Xiphoceras
Subtaxa: Brachydomoceras Cyrtogomphoceras Furudaloceras Kiaeroceras Konglungenoceras Kullsbergoceras Landeroceras Parryoceras Pectinoceras Polyelasmoceras Strandoceras Ulrichoceras
Type: Polyelasmoceras
Ecology: nektobenthic carnivore
Distribution:
• Devonian of Australia (3 collections)
• Ordovician of Canada (17: Manitoba, Mantiboa, Northwest Territories, Nunavut, Saskatchewan), China (1), Estonia (6), Greenland (1), Norway (5), Sweden (5), the United Kingdom (1), United States (8: Colorado, Illinois, Iowa, Wisconsin, Minnesota, South Dakota, Wyoming)
Total: 47 collections including 70 occurrences