Portunus pankowskiorum

Miocene

Monterey Formation

Santa Barbara County CA USA.

46mm carapace on 105mm slab.

Crustacean.  Arthropod.

Portunus is a genus of crab that appeared during the Middle Eocene and still lives today.  Fossil specimens have been found in the United States, Mexico, Haiti, Brazil, southern Europe, Malaysia, and Pakistan.

The genus includes a few modern species that are commercially-fished such as the blue swimming crab.