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

Hildoceratoidea, formerly Hildocerataceae, is a superfamily of compressed or planulate ammonites, some tending to develop acute outer rims; generally with arcuate or sigmoidal ribs. Aptichus were found in place are double-valved.〔Arkell et al, Treatise on Invertebrate Paleontology, Part L Ammonoidea, (1956)〕
Hildoceratoidea is an upper Lower- to lower Middle Jurassic group belonging to the Ammonitina that unites the Hildoceratidae, Hammatoceratidae, Graphoceratidae, and Sonniniidae.〔 In some taxonomies the name Phymatoceratidae is substituted for the Hammatoceratidae〔Taxonomicon(Hildocerataceae)|()〕

Hildoceratidae, which is the ancestral family, is derived from the Acanthopleuroceratinae, a subfamily in the Eoderoceratacean family, Polyorphitidae. The Stephanocerataceae, Perisphinctaceae, and Haplocerataceae have their source in the Hammitoceratidae which is derived from the Hildoceratidae .〔
==References==


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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