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Ptycholytoceras : ウィキペディア英語版 | Ptycholytoceras
''Ptycholytoceras'' is fast-moving nektonic ammonoid carnivore included in the Lytoceratinae in which the shell has round inner and depressed outer whorls and sides with dorso-ventrally sloping folds that do not pass onto the venter,(outer rim). The type species ''Phycholyioceras humile'' (Prinz), named by Spath, 1924, first described as ''Lytoceras humile'' by Prinz in 1904, came from the Lower Jurassic (Toarcian) of Hungary. ==References== W.J.Arkell,''et al'' 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L. Geological Society of America and Univ Kansas press.
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