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Orthoceratidae
Orthoceratidae, is an extinct family of actively mobile carnivorous cephalopods, subclass Nautiloidea, that lived in what would be North America, Europe, Asia, Africa, and Australia from the Ordovician through Triassic from 490—203.7 mya, existing for approximately .〔(PaleoBiology Database: ''Orthoceratidae'', basic info )〕
==Taxonomy==
Orthoceratidae was named by McCoy (1844) and assigned to the Orthocerida by Teichert and Miller (1939),(as Orthocerotidae);〔Sweet, Walter C., (1964), Nautiloidea --Orthocerida, in ''Treatise on Invertebrate Paleontology''. Part K. Mollusca 3. pp K224-K231.〕 to the Michelinoceratida by Flower (1962),〔R. H. Flower. 1962. Memoir 10, Part 2; Notes on the Michelinoceratida. New Mexico Bureau of Mines and Mineral Resources, Socorro NM.〕 and to the Orthocerataceae by Sweet (1964).〔 It has been subsequently included in the Orthocerataceae in Evans (1994) and in the Orthocerida in Evans (2005) 〔D. H. Evans. 2005. The Lower and Middle Ordovician cephalopod faunas of England and Wales. Monograph of the Palaeontographical Society 623:1-81〕 and in Kröger et al. (2007)〔B. Kröger, M. S. Beresi, and E. Landing. 2007. Early orthoceratoid cephalopods from the Argentine Precordillera (Lower-Middle Ordovician). Journal of Paleontology 81(6):1266-1283〕 Flower showed in 1962〔 that Orthocerotidae used by Teichert and Miller (1939) is synonymous with Orthoceratide McCoy (1884)
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