Thoracotremata | |
---|---|
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 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 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 |
| ||||||||||||||||||
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]
Thoracotremata | |
However, recent studies have found the superfamilies Grapsoidea and Ocypodoidea to be polyphyletic and invalid. [2] [3]
Thoracotremata | |
---|---|
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 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 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 |
| ||||||||||||||||||
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]
Thoracotremata | |
However, recent studies have found the superfamilies Grapsoidea and Ocypodoidea to be polyphyletic and invalid. [2] [3]