Heterotremata
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Heterotremata is the sister group to Thoracotremata 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:
The internal relationships within Heterotremata are less certain, with many of the superfamilies found to be invalid. The proposed cladogram below is from analysis by Tsang et al, 2014:
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Superfamilies
- Aethroidea
- Bellioidea
- Bythograeoidea
- Calappoidea
- Cancroidea
- Carpilioidea
- Cheiragonoidea
- Corystoidea
- Dairoidea
- Dorippoidea
- Eriphioidea
- Gecarcinucoidea
- Goneplacoidea
- Hexapodoidea
- Leucosioidea
- Majoidea
- Orithyioidea
- Palicoidea
- Parthenopoidea
- Pilumnoidea
- Portunoidea
- Potamoidea
- Pseudothelphusoidea
- Pseudozioidea
- Retroplumoidea
- Trapezioidea
- Trichodactyloidea
- Xanthoidea
However, recent studies have found the following superfamilies and families to not be monophyletic, but rather paraphyletic or polyphyletic:
- The superfamilies Calappoidea, Eriphioidea, and Goneplacoidea are polyphyletic
- The superfamily Potamoidea is paraphyletic with respect to Gecarcinucoidea, which is resolved by placing Gecarcinucidae within Potamoidea
- The Majoidea families Epialtidae, Mithracidae and Majidae are polyphyletic with respect to each other
- The Xanthoidea family Xanthidae is paraphyletic with respect to Panopeidae
More in Animals
Monotypic taxonTaxonomic group with only one subordinate taxonSpecies descriptionFormal description of a discovered speciesParaphylyType of taxonomic groupIUCN Red ListInventory of the global conservation status of biological speciesSubtropicsGeographic and climate zoneCommon nameName generally used for a taxon, group of taxa or organism(s)