Ontogenetic trajectory of septal spacing The measured septal spacings of the early conch in Pachydesmoceras denisonianum reveal a nearly stable pattern with a slightly increasing trend (standard deviation = 1.93°) ( Fig. 5B ).
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Early conch morphology of a gigantic Cretaceous ammonoid, <i>Pachydesmoceras denisonianum</i> (Desmoceratidae).
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