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The Barrandeoceratidae is a family of coiled nautiloids included in the Tarphycerida (''sensu lato'') that lived from the Middle Ordovician to the Middle Devonian, characterised by mostly compressed shells with a subcentral siphuncle composed of thin-walled segments that may become secondarily ventral.(Flower and Kummel 1950, Sweet 1964). The Barrandeoceratidae are derived from the tarphyceritid genus, ''Centrotarphyceras'' through ''Barrandeoceras'' (Flower 1984), and is the source for the Uranoceratidae and Nephriticeratidae. These three families form the barrandeoceratid group. Sometimes a fourth family, the Bickmoritidae, is added, based on the genus ''Bickmorites''. Genera (Flower 1984) include ''Barrandeoceras'', ''Centrocyrtoceras'', ''Paquettoceras'', ''Savageoceras'', ''Gasconsoceras'', ''Haydenoceras'', and ''Paraplectoceras''; and if included, ''Bickmorites''. ''Avilionella'' and ''Laureloceras'', included in the Barrandeocerida in the ''Treatise on Invertebrate Paleontology'' Part K (1964) have been removed to the Plectoceratidae. ==''References''== *Flower, R.H. & Kummel, B. 1950. A Classification of the Nautiloidea. Journal of Paleontology vol 24, no.5, pp604–616, Sept 1950. *Flower, R.H. 1984, ''Bodeiceras'', a New Mohawkian Oxycone, with Revision of the Older Barrandeoceratida, and Discussion of the Status of the Order. Journal of Paleontology vol 58, no. 6, pp1372–1379, Nov 1984. *Sweet, Walter C, 1964. Nautiloidea - Barrandeocerida, in Treatise on Invertebrate Paleontology, Part K, Geol Soc of America, Teichert & Moore,(eds) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Barrandeoceratidae」の詳細全文を読む スポンサード リンク
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