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Haploceras
''Haploceras'' is a late Upper Jurassic (Kimmeridgian and Tithonian) ammonoid cephalopod and type for the Haploceratidae, similar to ''Lissoceras'' but with a broader whorl section and small blunt lappets and a blunt rostrum; some species with feeble ventral folds on body chamber. ''Haploceras'' has been found worldwide, in North America, Africa, Europe and the mid east. ==References== Arkell et al., 1957 Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L. Geol Society of America and Univ Kansas Press R.C Moore (ed) (Paleodb Haploceratidae )
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