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Dissidocerida : ウィキペディア英語版
Dissidocerida

Dissidocerida comprise an order of Early Ordovician to the Early Silurian orthoceratoid cephalopods in which the siphuncle has a continuous lining or a longitudinal rod-like structure within.
The order Dissidocerida was proposed by Zhuravleva (1994) for ''Dissidoceras undosum'' Zhuravleva, 1964, a Silurian orthoconic genus with a wide, nearly central, tubular siphuncle, suborthochoanitic septal necks, and endosiphuncular rod; in many aspects similar to rod-bearing orthocones of the Ordovician. It is thought by some that Ordovician-Silurian orthocones with continuous longitudinal endosiphuncular laninar deposits constitute a single phylogenetic stock.
The Dissidocerida as understood includes the Polymeridae, Rangeroceratidae, Troedssonellidae, and Dissidocertidae. The Polymeridae and Rangeroceratidae were proposed by Evans in 2005 for ''Polymeres'' Murchison 1839 and ''Rangeroceras'' Hook and Flower 1977, respectively. Troedssonellidae was established by Kobayashi in 1935 and is based on the genus ''Troedssonella''. The Dissidoceratidae was established by Zhuravleva for ''Dissidoceras undosum''
==See also==

*List of nautiloids

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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