Full reference: I. S. Barskov. 1968. K evolutsii otryada Pseudorthoceratida (Golovonogye Mollyuski). Vsesoyusnoe Paleontologicheskogo Obchestvo, Trudy XII sessii Vsesoyusnovo Paleontologicheskogo Obchestvo 1968:90-97
Parent taxon: Orthoceratoidea according to A. Pohle and C. Klug 2024
See also Evans 2005, King and Evans 2019, Kröger 2008 and Pohle et al. 2022
Sister taxa: Actinocerida, Dissidocerida, Lituitida, Offleyoceratidae, Orthocerida, Paraphragmitidae, Protobactritidae, Riocerida, Slemmestadoceras, Orthoceras indoaustralicum, Orthoceras triadicum, Orthoceras mojsisovicsi, Orthoceras celticum, Orthoceras billiemense, Orthoceras pulchellum, Orthoceras subtiliseptatum, Orthoceras lennaense, Orthoceras subellipticum, Orthoceras nodosum, Orthoceras lateseptatum, Orthoceras spitiense, Orthoceras increscens, Orthoceras blakei, Orthoceras multilabiatum, Orthoceras styriacum, Orthoceras rotundulum, Orthoceras austriacum, Orthoceras variestriatum, Orthoceras acum, Orthoceras baconicum, Orthoceras pulchristriatum, Orthoceras sandlingense, Orthoceras shastense
Subtaxa: Pseudorthoceratidae Spyroceratidae Trematoceratidae
Ecology: fast-moving nektonic carnivore
Distribution:
• Cretaceous of the Russian Federation (1 collection)
• Triassic of Afghanistan (2), Austria (16), Bosnia and Herzegovina (5), China (7), Hungary (4), India (3), Italy (13), Japan (4), Kazakhstan (8), Nepal (1), Romania (9), the Russian Federation (16), Switzerland (17), Türkiye (1), United States (18: Idaho, Nevada), Vietnam (1)
• Permian of Argentina (1), Armenia (1), Australia (2), Azerbaijan (13), China (47), Colombia (3), Greece (1), Iran (15), Italy (4), Japan (4), Malaysia (1), Mexico (6), Oman (1), Pakistan (1), the Russian Federation (8), Tajikistan (5), Timor-Leste (1), United States (35: Arizona, California, Idaho, Kansas, Nevada, New Mexico, Texas, Utah, Wyoming), Venezuela (2)
• Carboniferous to Permian of Japan (1)
• Carboniferous of Argentina (1), Australia (2), Canada (2: Nova Scotia), Czechia (2), Ireland (1), Kazakhstan (1), the Russian Federation (1), Ukraine (1), the United Kingdom (26), United States (280: Alabama, Arkansas, California, Colorado, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Montana, Nevada, New Mexico, Ohio, Oklahoma, Texas)
• Devonian of Australia (1), Canada (1: Ontario), Czechia (10), Germany (4), Kyrgyzstan (1), Morocco (17), the Russian Federation (2), United States (62: Colorado, Indiana, New York, Pennsylvania)
• Silurian of Canada (3: Northwest Territories), China (2), Czechia (1), Germany (2), Italy (4), Morocco (1), Poland (3), the Russian Federation (5), United States (4: Alaska, New York)
• Whiterockian of United States (2: California)
• Chazyan of Canada (1: Quebec)
• Ordovician of Canada (29: Manitoba, Newfoundland and Labrador, Northwest Territories, Nunavut, Ontario, Quebec, Saskatchewan), Estonia (5), Greenland (1), Norway (6), the United Kingdom (1), United States (26: Colorado, Illinois, Iowa, Wisconsin, Indiana, Ohio, Iowa, Michigan, Minnesota, Missouri, New York, Ohio, South Dakota, Tennessee, Virginia, Wyoming)
Total: 789 collections including 1006 occurrences