Feldmann, R., & Portell, R. (2007). First Report of Costacopluma Collins and Morris, 1975 (Decapoda: Brachyura: Retroplumidae) from the Eocene of Alabama, U.S.A. Journal of Crustacean Biology. https://doi.org/http://dx.doi.org/10.1651/S-2712.1
Feldmann, Rodney, and Roger Portell. 2007. “A”. Journal of Crustacean Biology. https://doi.org/http://dx.doi.org/10.1651/S-2712.1.
Feldmann, R., and R. Portell. First Report of Costacopluma Collins and Morris, 1975 (Decapoda: Brachyura: Retroplumidae) from the Eocene of Alabama, U.S.A. Journal of Crustacean Biology, 1 Jan. 2007, doi:http://dx.doi.org/10.1651/S-2712.1.