Mecochirus magnus
Crustacean
Early Cretaceous (Aptian)
Teruel, Spain

Huge 180mm lobster in 220mm paired concretion.

Mecochirus was a lobster-like crustacean perhaps best known from the Late Jurassic limestones of southern Germany.  Here is a specimen from a locality that has yielded a good diversity of marine fossils yet precious few specimens reach the market.