†family Protocycloceratidae Kobayashi 1935 (mollusk)

Cephalopoda - Orthoceratoidea - Protocycloceratidae

Synonym: Rhabdocycloceratidae Zhuravleva 1994

Parent taxon: Orthoceratoidea according to D.H. Evans 2011

See also Flower 1964, Hook and Flower 1977 and Kröger and Landing 2009

Sister taxa: Brachycycloceratidae, Offleyoceratidae, Paraphragmitidae, Sactorthoceratidae, Slemmestadoceras

Subtaxa: Catoraphiceras Catoraphinoceras Cyptendoceras Diastoloceras Endocycloceras Kyminoceras Notocycloceras Protocycloceras

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Ecology: fast-moving nektonic carnivore

Distribution:

• Virgilian of United States (1: Ohio collection)

• Desmoinesian of United States (2: Pennsylvania)

• Carboniferous of United States (4: Ohio, Pennsylvania)

• Ordovician of Argentina (2), Bolivia (1), Canada (4: Newfoundland, Newfoundland and Labrador, Quebec), China (12), the Russian Federation (2), Sweden (1), the United Kingdom (22), United States (19: Alabama, Arkansas, Colorado, Maryland, Missouri, Nevada, New Mexico, New York, Tennessee, Texas, Utah)

• Whiterockian of United States (2: Utah)

• Arenig of Argentina (1), Bolivia (1), China (16), Sweden (1)

• Dawan of China (8)

• Cassinian of Canada (7: Newfoundland and Labrador, Ontario, Quebec), United States (14: Minnesota, Nevada, New Mexico, New York, Texas, Vermont)

• Jeffersonian of Canada (1: Quebec)

Total: 121 collections including 138 occurrences

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