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Hemilytoceras : ウィキペディア英語版 | Hemilytoceras
''Hemilytoceras'' is a lytoceratin ammonite genus with round inner whorls, outer whorls becoming depressed and in some developing high lamellae (ribs) that bend forward over the venter. The type species ''H. immanae'' came from the Tithonian of Europe. The genus is known from the overall Upper Jurassic of central and southern Europe, North Africa, and western India. == 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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