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Wutinoceratidae
The Wutinoceratidae is a family of early actinocerids defined by Shimazu and Obata in 1938〔Flower 1976. New American Wutinoceratidae with Review of Actinoceroid Occurrences in Eastern Hemisphere;PartI, Memoir 28; New Mexico Bureau of Mines and Mineral Resources〕 for actinocerids with thick connecting rings and a complex irregular canal system. Actinocerids are generally straight shelled nautiloid cephalopods with a siphuncle composed of expanded segments, typically with thin connecting rings, in which there are internal deposits penetrated by a system of canals.〔Teichert 1964. Actinoceratoidea, Treatise on Invertebrate Paleontology, part K.(Nautiloidea)〕
The Wutinoceratidae includes three genera,〔〔Flower 1957. Studies of the Actinoceratida. Memoir 2; New Mexico Bureau of Mines and Mineral Resources, Socorro, NM〕 ''Wutinoceras'', ''Cyrtonybyoceras'', and ''Adamsoceras'', known especially from the early Middle Ordovician (Whiterock stage) in northeastern China and North America, but found also from the same age in Australia and northern Europe. Wutinoceras is the earliest and gave rise to Cyrtonybyoceras and Adamsoceras. Cyrtonybyoceras left no descendants but Adamsoceras give rise to the Ormoceratidae. Wutinoceras, further on, gave rise to the Armenoceratidae and possibly to the immediate ancestors of ''Actinoceras''.〔
==References==
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