Fig. 14From: Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoidsBivariate plots of phragmocone diameter and septal distance in the Late Tournaisian assemblage of Oued Temertasset (grey background dots represent the entire sample). A, D, G, J, M Septal spaces of all septa in the last half volution. B, E, H, K, N Septal spaces of the last three septa. C, F, I, L, O Difference in the septal distances of the last three septa all septa in the last half volution. A–C Complete assemblage. D–F Family Prionoceratidae. G–I Family Pericyclidae. J–L Family Muensteroceratidae. M–O Family GoniatitidaeBack to article page