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Selkirkoceras : ウィキペディア英語版 | Selkirkoceras
''Selkirkoceras'' is an armonoceratid cephalopod similar to ''Kochoceras'' of the Actinoceratidae, but with recumbent septal necks. The first siphuncular segment is large, broad, and blunt. ''Selkirkoceras'', which is known from the Middle Ordovician of western North America, is included in the ''Nybyoceras'' branch of the Armenoceratidae (Teichert, 1964), which also includes ''Nybyoceras'' and ''Megadisocosorus''. ==References==
* Curt Teichert, 1964. Actinoceratoidea, Treatise on Invertebrate Paleontology, Part K. Geological Society of America and University of Kansas Press.
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