Grapsoidea

The Grapsoidea are a superfamily of crabs; they are well known and contain many taxa which are terrestrial (land-living), semiterrestrial (taking to the sea only for reproduction), or limnic (living in fresh water). Another well-known member with a more conventional lifestyle is the Chinese mitten crab, Eriocheir sinensis.

Grapsoidea
Purple shore crab (Hemigrapsus nudus: Varunidae)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Malacostraca
Order:	Decapoda
Suborder:	Pleocyemata
(unranked):	Reptantia
Infraorder:	Brachyura
Section:	Eubrachyura
Subsection:	Thoracotremata
Superfamily:	Grapsoidea Macleay, 1838
Families [1]
Gecarcinidae Glyptograpsidae Grapsidae Percnidae Plagusiidae Sesarmidae Varunidae Xenograpsidae
Synonyms
See text

The delimitation of the Grapsidae and Plagusiidae is in need of revision; the latter at least is not monophyletic. The same apparently holds true for several genera in the Sesarmidae.^[2][3][4]

The closest living relatives of the Grapsoidea are the Ocypodoidea. In fact, they seem to be paraphyletic with respect to each other and it seems warranted to merge the Ocypodoidea into the Grapsoidea.^[4]