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The shell is discoidal, primarily evolute, becoming mildly involute in later growth stage, moderately to rapidly expanding. Whorl section of first two whorls approximately circular, subtrapezoidal in later whorls. Umbilicas perforated, protoconch swollen, not in contact with first whorl. Growth
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Miller, Furnish, and
Schindewolf, 1957. Paleozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L.
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lines biconvex with prominent ventrolateral projections and a deep ventral sinus.
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243:Learn how and when to remove this message
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331:tax00000000000000000000000000335
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165:, regarded as belonging to the
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463:Fossils of the Czech Republic
169:as a member of the subfamily
161:which lived during the early
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55:Scientific classification
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365:Paleobiology Database
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