Retropluma Gill 1894 (crab)
Malacostraca - Decapoda - Geryonidae
Synonym: Archaeoplax Stimpson 1863
Parent taxon: Geryonidae according to C. E. Schweitzer et al. 2010
Sister taxa: Archaeogeryon, Chaceon
Subtaxa: Archaeoplax signifera, Retropluma borealis, Retropluma craverii, Retropluma eocenica, Retropluma gallica, Retropluma laurentae
Ecology: epifaunal carnivore