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Swiss Journal of Palaeontology
Fig. 13 | Swiss Journal of Palaeontology

Fig. 13

From: Is the relative thickness of ammonoid septa influenced by ocean acidification, phylogenetic relationships and palaeogeographic position?

Fig. 13

Conch diameter at the measured septum as a function of septal thickness grouped into the corresponding geological age. The dashed lines indicate the linear regression lines. Longitudinal sections of representative specimens illustrate the respective septal thickness. Jurassic: Arietites sp. (Arietitidae), Triassic: Rhacophyllites neojurensis (Phylloceratidae), Cretaceous: Argonauticeras besairei (Lytoceratidae)

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