Ammonite Shell Collection 1. Lytocerotina a grand order of Cretaceous ammonitea Lytocerotina are usually circular and have vibrate shells in which the grooved element has a multitude of vein like sub growths. 2. Cretaceous 3. C Lytocerotina 4.  Cretaceous ammonitea There are 171 species of Cretaceous ammonitea, I could only find one reference online for Lytocerotina which was […]