Nine specimens of retroplumid crabs collected from the late early or early middle Eocene Tallahatta Formation in southern Alabama form the basis for description of a new species, Costacopluma grayi. The discovery confirms the extension of the range of the genus into the Eocene and represents the first occurrence ofCostacopluma in the United States. As a result of the geologic range extension, the genus is now known to be contemporary with two other retroplumid genera, Retrocypoda, and Retropluma.
Journal of Crustacean Biology
Feldmann, Rodney; Portell, Roger W (2007). First Report of Costacopluma Collins and Morris, 1975 (Decapoda: Brachyura: Retroplumidae) from the Eocene of Alabama, U.S.A.. Journal of Crustacean Biology 27(1) 90-96. doi: http://dx.doi.org/10.1651/S-2712.1. Retrieved from https://oaks.kent.edu/geolpubs/135