Journey in extinct seas and oceans

Dear Friends
well developed at the Munich Show is the theme of the sea life in extinct seas and oceans
https://en.wikipedia.org/wiki/Tethys_Ocean https://en.wikipedia.org/wiki/Paratethys
https://en.wikipedia.org/wiki/Pannonian_Sea .  Among the ancient big and small water inhabitants, sea urchins https://en.wikipedia.org/wiki/Sea_urchin and crabs  https://en.wikipedia.org/wiki/Crab , nice in their structures - see the images - evidently played a non-secondary role as the prices also testify.

Salutations
Giancarlo