Fig. 7From: Pseudoinversion of septal sutures in Middle Jurassic–Lower Cretaceous non-heteromorph ammonitesAspidoceras cf. caletanum (Oppel) with transitional sutural pseudoinversion, lateral view; Upper Kimmeridian, Eudoxus Zone, Lipitsy, Kaluga region; specimen no. PIN 3685/5477, a—full view; b—enlarged photo of last sutures showing pseudinversionBack to article page