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]
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]
^Sammy De Grave; N. Dean Pentcheff; Shane T. Ahyong; et al. (2009). "A classification of living and fossil genera of decapod crustaceans" (PDF). Raffles Bulletin of Zoology. Suppl. 21: 1–109.
^ abcLing Ming Tsang; Christoph D. Schubart; Shane T. Ahyong; Joelle C.Y. Lai; Eugene Y.C. Au; Tin-Yam Chan; Peter K.L. Ng; Ka Hou Chu (2014). "Evolutionary History of True Crabs (Crustacea: Decapoda: Brachyura) and the Origin of Freshwater Crabs". Molecular Biology and Evolution. Oxford University Press . 31 (5): 1173–1187. doi:10.1093/molbev/msu068.
^ abWolfe, Joanna M.; Breinholt, Jesse W.; Crandall, Keith A.; Lemmon, Alan R.; Lemmon, Emily Moriarty; Timm, Laura E.; Siddall, Mark E.; Bracken-Grissom, Heather D. (24 April 2019). "A phylogenomic framework, evolutionary timeline and genomic resources for comparative studies of decapod crustaceans". Proceedings of the Royal Society B. 286 (1901). doi:10.1098/rspb.2019.0079. PMC6501934. PMID 31014217.
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thoracotremata, clade, crabs, comprising, those, crabs, which, genital, openings, both, sexes, sternum, rather, than, legs, comprises, families, four, superfamilies, leptograpsus, variegatus, grapsidaescientific, classificationdomain, eukaryotakingdom, animali. 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 ThoracotremataLeptograpsus variegatus GrapsidaeScientific classificationDomain EukaryotaKingdom AnimaliaPhylum ArthropodaClass MalacostracaOrder DecapodaSuborder PleocyemataInfraorder BrachyuraSection EubrachyuraSubsection ThoracotremataGuinot 1977FamiliesSee textEvolution editThoracotremata 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 DromiaceaRaninoidaCyclodorippoidaEubrachyura HeterotremataThoracotremataThe 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 PinnotheridaeDotillidaePercnidaeXenograpsidaeCryptochiridaeOcypodidaeGlyptograpsidaeGrapsidaePlagusiidaeGecarcinidaeSesarmidaeMictyridaeVarunidaeMacrophthalmidaeSuperfamilies and families editOcypodoidea Camptandriidae Dotillidae Heloeciidae Macrophthalmidae Mictyridae Ocypodidae Ucididae Xenophthalmidae Pinnotheroidea Pinnotheridae Cryptochiroidea Cryptochiridae Grapsoidea Gecarcinidae Glyptograpsidae Grapsidae Plagusiidae Sesarmidae Varunidae Xenograpsidae However recent studies have found the superfamilies Grapsoidea and Ocypodoidea to be polyphyletic and invalid 2 3 References edit Sammy De Grave N Dean Pentcheff Shane T Ahyong et al 2009 A classification of living and fossil genera of decapod crustaceans PDF Raffles Bulletin of Zoology Suppl 21 1 109 a b c Ling Ming Tsang Christoph D Schubart Shane T Ahyong Joelle C Y Lai Eugene Y C Au Tin Yam Chan Peter K L Ng Ka Hou Chu 2014 Evolutionary History of True Crabs Crustacea Decapoda Brachyura and the Origin of Freshwater Crabs Molecular Biology and Evolution Oxford University Press 31 5 1173 1187 doi 10 1093 molbev msu068 a b Wolfe Joanna M Breinholt Jesse W Crandall Keith A Lemmon Alan R Lemmon Emily Moriarty Timm Laura E Siddall Mark E Bracken Grissom Heather D 24 April 2019 A phylogenomic framework evolutionary timeline and genomic resources for comparative studies of decapod crustaceans Proceedings of the Royal Society B 286 1901 doi 10 1098 rspb 2019 0079 PMC 6501934 PMID 31014217 nbsp This crab article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Thoracotremata amp oldid 1097859054, wikipedia, wiki, book, books, library,
