Unusuropode castroi Duarte & Santos, 1962

Late Cretaceous (Cenomanian)
Gara Sbaa Member, Akrabou Formation
Gara Sbaa, Morocco

11mm negative marine isopod
Crustacean,

Isopods belong to an order of crustaceans that dates back to the Carboniferous Period – first-known from the Mazon Creek fauna – but are uncommon overall in the fossil record.  Biologists have studied modern ones the size of a lobster collected from the ocean depths.  However, most are small like the “pill bugs” you found in your grandparents’ garden.