Cephalopoda - Oncocerida - Trimeroceratidae
Parent taxon: Oncoceratida according to C. Teichert et al. 1964
See also Chen et al. 1981 and 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, Hemiphragmoceratidae, 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, Tripleuroceratidae, Valcouroceratidae, Wetherbyoceras, Xainzanoceras
Subtaxa: Clathroceras Eotrimeroceras Inversoceras Jeppssonoceras Pentameroceras Platycomeroceras Plemeroceras Stenogomphoceras Trimeroceras
Ecology: fast-moving nektobenthic carnivore
Distribution:
• Niagaran of United States (1: Indiana collection)
• Silurian of Canada (9: Quebec, Québec), China (2), the Czech Republic (1), Italy (1), the Russian Federation (1), Sweden (9), United States (1: Wisconsin)
Total: 25 collections including 39 occurrences