A single large specimen of carcineretid crab from the Cretaceous Puerto Romero unit of Colombia constitutes the basis for a new species, Ophthalmoplax triambonatus. A re-diagnosis of the Carcineretidae results in the assignment of five genera to the family: CarcineretesWithers, 1922; BranchiocarcinusVega, Feldmann, and Sour-Tovar, 1995; MascaranadaVega and Feldmann, 1991; OphthalmoplaxRathbun, 1935; and WoodbinaxStenzel, 1952. The cross-sectional profile of O. triambonatus suggests that it was a back-burrower, rather than an active swimmer.

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