Cancroidea
Encyclopedia
Cancroidea is a superfamily of crab
s, comprising the families Atelecyclidae
and Cancridae
. Two families previously included in this superfamily have since been separated off into new superfamilies – Cheiragonidae
into Cheiragonoidea, Corystidae
into Corystoidea – while two others (Pirimelidae, Thiidae) have been transferred to Portunoidea
.
Crab
True crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" , or where the reduced abdomen is entirely hidden under the thorax...
s, comprising the families Atelecyclidae
Atelecyclidae
Atelecyclidae is a family of crabs belonging to the Cancroidea superfamily, and currently containing eight genera two of which are extinct. However, the genera other than Atelecyclus do not belong in the Cancroidea, and are to be removed from the family....
and Cancridae
Cancridae
Cancridae is a family of crabs. It comprises six extant genera, and eleven exclusively fossil genera, in two subfamilies:Cancrinae Latreille, 1802*Anatolikos Schweitzer & Feldmann, 2000*†Anisospinos Schweitzer & Feldmann, 2000...
. Two families previously included in this superfamily have since been separated off into new superfamilies – Cheiragonidae
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, and 13 extinct species in the three genera Karasawaia, Montezumella and...
into Cheiragonoidea, Corystidae
Corystidae
Corystidae is a family of crabs, in its own superfamily, Corystoidea. It includes the oldest Eubrachyuran fossil, Hebertides jurassica, dating from the Bathonian...
into Corystoidea – while two others (Pirimelidae, Thiidae) have been transferred to Portunoidea
Portunoidea
Portunoidea is a superfamily of crabs that includes the family Portunidae, the swimming crabs. Which other crab families are also placed here is a matter of some contention, and may be revised following molecular phylogenetic analyses.-Description:...
.