Fig. 7From: Patterns of the evolution of aptychi of Middle Jurassic to Early Cretaceous Boreal ammonitesAptychi distribution among the selected Middle Jurassic–Early Cretaceous ammonite lineages. Ammonoid suborders and evolution of lineages are given after Besnosov and Michailova (1991), Page (2008) and Shevyrev (2006); spelling of suborder is given after Shevyrev (2006)Back to article page