Fig. 4
From: Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoids
Ontogenetic trajectories representative for the six distinguished groups with different modes of septal distance, shown in specimens of Late Tournaisian ammonoids from Oued Temertasset (Algeria). Phragmocone diameters in the lower right boxes. Grey dots = empirical data; black dots = three neighbouring data points averaged. A Group 1: Jerania persimilis Korn, Bockwinkel & Ebbighausen, 2010a; specimen MB.C.18940.1. B Group 2: Muensteroceras multitudum Korn, Bockwinkel & Ebbighausen, 2010a; specimen MB.C.18992.1. C Group 3: Helicocyclus inornatus Korn, Bockwinkel & Ebbighausen, 2010a; specimen MB.C.19035.1. D Group 4: Pericyclus intercisus Korn, Bockwinkel & Ebbighausen, 2010a; specimen MB.C.18862.2. E Group 5: Pericyclus circulus Korn, Bockwinkel & Ebbighausen, 2010a; specimen MB.C.18862.4. F Group 6: Temertassetia temertassetensis Korn, Bockwinkel & Ebbighausen, 2010a; specimen MB.C.18865.1