Cephalopoda - Oncocerida - Hemiphragmoceratidae
Parent taxon: Oncoceratida according to C. Teichert et al. 1964
See also Stridsberg 1985
Sister taxa: Acleistoceratidae, Agrioceras, Aktjuboceratidae, Alloceras, Almaloceras, Anonymoceras, Anthomorpha, Antonoceras, Aphyctoceras, Apioceras, Archiacoceratidae, Atomoceras, Balashovia, Barskoceras, Brevicoceratidae, Corbuloceras, Corysoceras, Cyrthocerataceae, Cyrtoceras, Devonocheilidae, Diestoceratidae, Doleroceras, Eocyrtoceras, Eudoceras, Gomphoceras, Graciloceratidae, Guangyuanoceras, Guangyuanoceroides, Iowoceras, Jovellaniidae, Karoceratidae, Kophinoceras, Lychnoceras, Megaloceras, Mimolychnoceras, Mnemoceras, Nelimenia, Nothoceratidae, Oligoceras, Oncoceratidae, Oonoceratidae, Oratoceras, Pachtoceras, Polyelasmoceratidae, Poterioceratidae, Pseudobrevicoceras, Pyramidoceras, Ramussenoceras, Rutoceratoidea, Spanioceras, Sycoceras, Torquatoceras, Trigonodema, Trimeroceratidae, Tripleuroceratidae, Valcouroceratidae, Wetherbyoceras, Xainzanoceras
Subtaxa: Conradoceras Hemiphragmoceras Hexameroceras Octamerella Octameroceras Tetrameroceras
Type: Hemiphragmoceras
Ecology: fast-moving nektobenthic carnivore
Distribution:
• Niagaran of United States (2: Indiana, Ohio collections)
• Silurian of the Czech Republic (3), Sweden (2), the United Kingdom (1), United States (8: Indiana, Michigan and Ohio, New York, West Virginia, Wisconsin)
Total: 16 collections including 21 occurrences