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Phylloceratina
The Phyllocertina comprise a suborder of ammonoid cephalopods, belonging to the Ammonitida, whose range extends from the Lower Triassic to the Upper Cretaceous. Shells of the Phylloceratina are generally smooth with small to large umbilici and complex sutures with leaf-like phylloid saddle endings and lobes with thorn-like projections.〔Treatise on Invertebrate Paleontology Part L Mollusca 4, Ammonoidea, 1957〕
==Phylogeny==
The Phylloceratina are most likely derived from the Ceratitid Deineroceratidae, which is though to have given rise early in the Triassic to the Ussuritidae. The Ussuritidae is the ancestral family of the Phylloceratina. The Ussuritidae extend through the Upper Triassic but not into the Jurassic, and gave rise to the Upper Triassic Discophyllitidae. The Discophyllitidae is the probable source for the L Jurassic - U Cretaceous Phylloceratidae and possibly for the L Jurassic Juraphyllitidae.
The Phylloceratina gave rise early in the Jurassic through the Phylloceratidae to the Lytoceratina, which in tern gave rise to most of the Ammonitina The Phylloceratidae also gave rise to the Psilocerataceae at the beginning of the Jurassic and to the Desmocerataceae in the Early Cretaceous, both of which are considered Ammonitina. The Ancyloceratina is a collection of highly evolved Lytoceratina.
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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