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Clade of crabs From Wikipedia, the free encyclopedia
Thoracotremata is a clade of crabs, comprising those crabs in which the genital openings in both sexes are on the sternum, rather than on the legs. It comprises 17 families in four superfamilies .[1]
Thoracotremata | |
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Leptograpsus variegatus, Grapsidae | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Malacostraca |
Order: | Decapoda |
Suborder: | Pleocyemata |
Infraorder: | Brachyura |
Section: | Eubrachyura |
Subsection: | Thoracotremata Guinot, 1977 |
Families | |
See text |
Thoracotremata is the sister group to Heterotremata within the clade Eubrachyura, having diverged during the Cretaceous period. Eubrachyura itself is a subset of the larger clade Brachyura, which consists of all "true crabs". A summary of the high-level internal relationships within Brachyura can be shown in the cladogram below: [2][3]
Brachyura |
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The internal relationships within Thoracotremata are less certain, with many of the superfamilies found to be invalid. The proposed cladogram below is from analysis by Tsang et al, 2014:[2]
However, recent studies have found the superfamilies Grapsoidea and Ocypodoidea to be polyphyletic and invalid.[2][3]
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