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.
3. C Lytocerotina
There are 171 species of Cretaceous ammonitea, I could only find one reference online for Lytocerotina which was a digital transcription for invertebrate paleontology published back in 1960. I have linked it here. Ammonites are often used to date sedimentary layers, specific species can be linked to time periods and locate extinction events. You can read more about them here.