Shamed-Face Box Crab, Calappa convexa: The Shamed-Face Crab is one of 39 members of the Calappidae Family or Box Crabs known in Mexico as Cangrejo Cajeta Bolas. Each member has mouth parts that taper toward the rear of the body and form a triangle. The shell (carapace) is broader than it is long.
The common name of the Shamed-Face Box Crab is derived from the pair of equal sized large claws that normally cover the face.
The common name of Box Crab is derived from the rectangular shape of the shell.
The Shamed-Face Box Crab is caught as a by-catch of commercial shrimp netters and gill netters of Spiny Lobsters. It is not abundant and thus of limited interest due to its size. It is normally discarded.
The Shamed-Face Box Crab reaches a maximum size of 6 inches. The claws have a limited market value but it requires 100 adult crabs to produce 15 pounds of claws with the balance of the crab discarded.
The Shamed-Face Box Crab is a shallow water species, being found in the first 200 feet of the water column over muddy and sandy bottoms.
In Mexican waters, it is found south of Magdalena Bay along the Pacific Coast of Baja California, throughout the Sea of Cortez, and along the coast of the mainland south to Guatemala.