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Dawsonoceratidae : ウィキペディア英語版 | Dawsonoceratidae
Dawsonoceratidae is an extinct family of orthoconic nautiloid cephalopods that lived in what would be North America and Europe from the Late Ordovician through the Middle Devonian from about 480–390 mya, existing for approximately .〔 (PaleoBiology Database: Dawsonoceratidae, basic info )〕 ==Taxonomic Position== Dawsonoceratidae was named by Flower (1962) and included in the Michelinoceratida.〔R. H. Flower. 1962, Notes on the Michelinoceratida Memoir 10 Part 2 New Mexico Bureau of Mines and Mineral Resources, Socorro New Mexico.〕 It was assigned to the Orthocerida by Walter Sweet in Teichert ''et al.'' 1964〔Sweet W. A. 1964, Nautiloidea - Orthocerida, Treatise on Invertebrate Paleontology Part K, Mollusca 3, Curt Teichert & R.C.Moore (eds)〕 as part of the Orthocerataceae. The type genus is ''Dawsonoceras'', named by Hyatt in 1883.〔
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