Cancroidea is a superfamily of

crab Crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" (abdomen) ( el, βραχύς , translit=brachys = short, / = tail), usually hidden entirely under the thorax. They live in all the ...

s, comprising the families

Atelecyclidae Atelecyclidae is a family of crabs belonging to the superfamily Cancroidea, and currently contains eight genera of which two are extinct. However, the genera other than '' Atelecyclus'' and '' Pseudocorystes'' do not belong in the Cancroidea, and ...

and

Cancridae Cancridae is a family of crabs. It comprises six extant genera, and ten exclusively fossil genera, in two subfamilies: Extant Genera Cancrinae Latreille, 1802 *'' Anatolikos'' Schweitzer & Feldmann, 2000 * ''Cancer'' Linnaeus, 1758 *''Glebocarci ...

. http://boletinsgm.igeolcu.unam.mx/bsgm/vols/epoca04/6502/%2810%29Osso.pdf Four other families have been separated into new superfamilies:

Cheiragonidae Cheiragonidae is a small family of crabs, sometimes called '' helmet crabs'', placed in its own superfamily, Cheriagonoidea. It comprises three extant species, '' Erimacrus isenbeckii'', '' Telmessus acutidens'' and ''Telmessus cheiragonus'', the ...

into

Cheiragonoidea Cheiragonidae is a small family (biology), family of crabs, sometimes called ''helmet crabs'', placed in its own Taxonomic rank, superfamily, Cheriagonoidea. It comprises three extant species, ''Horsehair crab, Erimacrus isenbeckii'', ''Telmessus ...

Corystidae Corystidae is a family of crabs, in its own superfamily, Corystoidea. It includes what was once thought to be the oldest Eubrachyuran fossil, '' Hebertides jurassica'', thought to be dating from the Bathonian (Middle Jurassic); the species was su ...

into

Corystoidea Corystidae is a family of crabs, in its own superfamily, Corystoidea. It includes what was once thought to be the oldest Eubrachyuran fossil, '' Hebertides jurassica'', thought to be dating from the Bathonian ( Middle Jurassic); the species was ...

, and both

Pirimelidae Pirimelinae is a subfamily of crabs belonging to the family Carcinidae in the order Decapoda The Decapoda or decapods (literally "ten-footed") are an order of crustaceans within the class Malacostraca, including many familiar groups, such as ...

and

Thiidae Thiidae is a family of crabs in the crustacean order Decapoda. Genera The family contains two genera in two subfamilies: * Subfamily Nautilocorystinae Ortmann, 1893 ** '' Nautilocorystes'' Milne Edwards, 1837 * Subfamily Thiinae Dana, 1852 ...

into Portunoidea. Montezumellidae has been moved from Cancroidea to his own Superfamily Montezumelloidea Ossó & Domínguez, 2019 (Zootaxa, 4623 (1): 175–188).

References

Crabs Arthropod superfamilies {{crab-stub