Fig. 6From: Is the relative thickness of ammonoid septa influenced by ocean acidification, phylogenetic relationships and palaeogeographic position?Descriptive terms for conch morphology in longitudinal section. dm1: whole diameter. ah: apertural height, dm2 = dm1 – ah. dx: Diameter at a specific septum. Red crosses stand representative for the three thickness measurement points at each septum. Descriptive terms after Korn (2010)Back to article page