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・ Dipterocarpus costatus
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Dipoloceras : ウィキペディア英語版
Dipoloceras

''Dipoloceras'' is a rather evolute, strongly ribbed and well keeled acanthocerataean ammonite from the Albian stage of the Lower Cretaceous included in the brancoceratid subfamily Mojsisovicziinae. The whorl section is typically inflated or depressed. Ribs are high standing, may be sharp, close to wide spaced. The ventral keel may sit below the level of the ribs.
''Dipoloceras'' is similar to but distinct from ''Oxytropidoceras'' in that ''Oxytropidoceras'' has a compressed whorl section, high standing keel and lower ribs. Both have more or less typical ammonitic sutures.
==References==

*Arkell ''et a''l, Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L (Ammonoidea). Geol Soc of Amer. and Univ Kans press. 1957
*Ryszard Marcinowski and Jost Wiedmann. The Albian Ammonites of Poland. Palaeontologia Polonica no. 50, 1990
*Description of Dipoloceras ()
''see also illustrations of''
''Dipoloceras cristatum'' (), ()


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