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Swiss Journal of Palaeontology
Fig. 7 | Swiss Journal of Palaeontology

Fig. 7

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

Fig. 7

Examples of different septal thickness ranges corresponding to their time period. The figure shows mainly two different septal thicknesses. Ammonoids from the Late Triassic and the Early Cretaceous show a greater septal thickness than those from the Early and Middle Jurassic. A Rhacophyllites neojurensis (Phylloceratidae); B Arietites sp. (Arietitidae); C Ludwigia bradfordensis (Graphoceratidae); D Argonauticeras besairei (Lytoceratidae). Well discernible examples of septa are indicated by red arrows

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