Retroplumidae is a family of heterotrematan crabs, placed in their own (monotypic) superfamily, Retroplumoidea.
Classification Eight genera are recognised, of which all but two are only known from fossils: Archaeopus † Rathbun, 1908 Bathypluma de Saint Laurent, 1989 Costacopluma † Collins & Morris, 1975 Cristipluma † Bishop, 1983a Loerentheya † Lőrenthey, in Lőrenthey & Beurlen, 1929 Loerenthopluma † Beschin, Busulini, De Angeli & Tessier, 1996 Retrocypoda † Vía, 1959 Retropluma Gill, 1894
Ten species in two genera survive in the deep sea of the Indo-Pacific region: Bathypluma chuni (Doflein, 1904) Bathypluma forficula De Saint Laurent, 1989 Bathypluma spinifer De Saint Laurent, 1989 Retropluma denticulata Rathbun, 1932 Retropluma quadrata De Saint Laurent, 1989 Retropluma notopus (Alcock & Anderson, 1894) Retropluma planiforma Kensley, 1969 Retropluma plumosa Tesch, 1918 Retropluma serenei De Saint Laurent, 1989 Retropluma solomonensis McLay, 2006
Fossil specimens ascribed to the Retroplumidae are known from the Late Cretaceous onwards, with Archaeopus antennatus in Coniacian–Maastrichtian rocks in California and Archaeopus ezoensis from Turonian–Maastrichtian rocks from Japan.
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