Cephalopoda - Tarphycerida - Trocholitidae
Parent taxon: Tarphycerida according to B. Kröger and M. Aubrechtová 2019
See also Crick 1981, Evans 2011, Hyatt 1894, Kröger and Aubrechtova 2017, Kröger and Landing 2009, Stait 1983, Stait and Burrett 1984, Strand 1934, Sweet 1958, Teichert et al. 1964 and Ulrich et al. 1942
Sister taxa: Bateroboceras, Bodieceras, Craftonoceras, Discoceratidae, Estonioceratidae, Inclytoceras, Magdoceras, Ophidioceratidae, Pakrioceras, Pseudancistroceras, Tarphyceratidae, Weberoceratidae
Subtaxa: Arkoceras Curtoceras Discoceras Graftonoceras Hardmanoceras Jasperoceras Litoceras Palaeonautilus Paradiscoceras Plectolites Schroederoceras Trocholites Trocholitoceras Wichitoceras
Ecology: fast-moving nektobenthic carnivore
Distribution:
• Dobrotivian of Czechia (4 collections), Spain (1)
• Whiterockian of United States (3: California, Nevada, Utah)
• Arenig of Argentina (2), China (3)
• Ordovician of Australia (7), Canada (16: Manitoba, Newfoundland and Labrador, Northwest Territories, Nunavut, Ontario, Quebec), China (26), Estonia (14), Ireland (1), Kazakhstan (1), Latvia (1), Lithuania (1), Malaysia (3), Norway (32), the Russian Federation (1), Spain (1), Sweden (15), the United Kingdom (1), United States (30: Arkansas, Kentucky, Missouri, Nevada, New York, Ohio, Oklahoma, Utah, Vermont, Virginia)
• Ibexian of Thailand (1)
Total: 164 collections including 196 occurrences