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Citation for Study 1784

About Citation title: "Phylogenetics of the brachyuran crabs (Crustacea: Decapoda): the status of Podotremata based on small subunit nuclear ribosomal RNA".
About This study was previously identified under the legacy study ID S1756 (Status: Published).


Ahyong S., Lai J., Sharkey D., Colgan D., & Ng P. 2007. Phylogenetics of the brachyuran crabs (Crustacea: Decapoda): the status of Podotremata based on small subunit nuclear ribosomal RNA. Molecular Phylogenetics and Evolution, 45(2): 576-586.


  • Ahyong S.
  • Lai J.
  • Sharkey D.
  • Colgan D.
  • Ng P.


The true crabs, the Brachyura, are generally divided into two major groups, the Eubrachyura or advanced crabs, and the Podotremata or primitive crabs. The status of Podotremata is one of the most controversial issues in brachyuran systematics. The podotreme crabs, best recognized by their possession of gonopores on the coxae of the pereopods, have variously been regarded as mono-, para- or polyphyletic, or even as non-brachyuran. For the first time, the phylogenetic positions of the podotreme crabs were studied by cladistic analysis of small subunit nuclear ribosomal RNA sequences. Eight of 10 podotreme families were represented along with representatives of 17 eubrachyuran families. Under both maximum parsimony and Bayesian Inference, Podotremata was found to be significantly paraphyletic, comprising three major clades: Dromiacea, Raninoida, and Cyclodorippoida. The most basal is Dromiacea, followed by Raninoida and Cylodorippoida. Notably, Cyclodorippoida was identified as the sister group of the Eubrachyura. Previous hypotheses that the dromiid crab, Hypoconcha, is an anomuran were unsupported, though Dromiidae as presently composed could be paraphyletic. Topologies constrained for podotreme monophyly were found to be significantly worse (P<0.04) than unconstrained topologies under Shimodaira-Hasegawa tests. The clear pattern of podotreme paraphyly and robustness of topologies recovered indicates that Podotremata as a formal concept should be abandoned. Relationships among the eubrachyurans were generally equivocal, though results indicate the majoids or dorippoids were the least derived of the Eubrachyura.

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