Cancroidea is a superfamily of
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, comprising the families
Atelecyclidae and
Cancridae.
[ http://boletinsgm.igeolcu.unam.mx/bsgm/vols/epoca04/6502/%2810%29Osso.pdf] Four other families have been separated into new superfamilies:
Cheiragonidae into
Cheiragonoidea,
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 Middle Jura ...
into
Corystoidea, and both
Pirimelidae and
Thiidae 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
{{Eubrachyura-stub