''Retropluma'' is a genus of

heterotremata Heterotremata is a clade of crabs, comprising those crabs in which the genital openings are on the sternum in females, but on the legs in males. It comprises 68 families in 28 superfamilies. Evolution Heterotremata is the sister group to Thora ...

crab Crabs are decapod crustaceans of the infraorder Brachyura (meaning "short tailed" in Greek language, Greek), which typically have a very short projecting tail-like abdomen#Arthropoda, abdomen, usually hidden entirely under the Thorax (arthropo ...

s belonging to the family

Retroplumidae 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 *'' ...

. The extant species survive in the

deep sea The deep sea is broadly defined as the ocean depth where light begins to fade, at an approximate depth of or the point of transition from continental shelves to continental slopes. Conditions within the deep sea are a combination of low tempe ...

of the

Indo-Pacific The Indo-Pacific is a vast biogeographic region of Earth. In a narrow sense, sometimes known as the Indo-West Pacific or Indo-Pacific Asia, it comprises the tropical waters of the Indian Ocean, the western and central Pacific Ocean, and the ...

region.

Species

Species within this genus include:WoRMS
/ref>Paleobiology Database
/ref> *

† A dagger, obelisk, or obelus is a typographical mark that usually indicates a footnote if an asterisk has already been used. The symbol is also used to indicate death (of people) or extinction (of species or languages). It is one of the mo ...

'' Retropluma borealis'' Fraaife et al. 2005 *

'' Retropluma craverii'' Crema 1895 *'' Retropluma denticulata'' Rathbun, 1932 *

'' Retropluma eocenica'' Via Boada 1959 *

'' Retropluma gallica'' Artal et al. 2006 *

'' Retropluma laurentae'' Collins et al. 2003 *'' Retropluma notopus'' (Alcock & Anderson, 1894) *'' Retropluma planiforma'' Kensley, 1969 *'' Retropluma plumosa'' Tesch, 1918 *'' Retropluma quadrata'' De Saint Laurent, 1989 *'' Retropluma serenei'' De Saint Laurent, 1989 *'' Retropluma solomonensis'' McLay, 2006

Fossil record

Fossils of ''Retropluma'' are found in marine strata from the

Neogene The Neogene ( ,) is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period million years ago ( Mya) to the beginning of the present Quaternary Period million years ago. It is the second period of th ...

to the

Pliocene The Pliocene ( ; also Pleiocene) is the epoch (geology), epoch in the geologic time scale that extends from 5.33 to 2.58Crabs Extant Miocene first appearances Messinian genera Zanclean genera Piacenzian genera Gelasian genera Calabrian genera Ionian genera Tarantian genera Holocene genera