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Choanoceratidae : ウィキペディア英語版 | Choanoceratidae
The Choanoceratidae is a small, mono-generic, family of extinct nautiloid cephalopods in the order Orthocerida that lived in what would be Europe during the middle Silurian from 428.2—426.2 mya, existing for approximately .〔(Choanoceratidae ) PaleoBiology Database〕 ==Taxonomy== Chaonoceratidae was named as the family for its sole member ''Choanoceras'' by Miller (1932) who, along with Flower (1941) regarded it as belonging to the Ascocerida. It became impossible to trace ''Choanoceras'' to the ascocerid lineage however, and based on closer affinities, it was assigned to the Michelinoceratida (Orthocerida equivalent) by Flower in 1962.〔R. H. Flower. 1962. Notes on the Michelinoceratida. State Bureau of Mines and Mineral Resources, New Mexico Institute of Mining and Technology, Memoir 10, Part II〕
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