Phylogenetic and Phenetic Relationships among the Lower Decapoda

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Abstract
Phenetic and cladistic methods were used to analyze relationships within the Decapoda. Eighty-nine characters were examined, and 64 of these were used in all analyses. Representatives of the Euphausiacea, Dendrobranchiata, Cardiea, Procaridoidea, Stenopodidea, Thalassinidea, and Astacidea were used to test hypotheses on the relationships within the Decapoda that recognize two, three, or four suborders. All analyses yielded the same result: (1) rejecting the concept of the Natantia as a monophyletic group; (2) recognizing two suborders of the Decapoda, the Dendrobranchiata and the Pleocyemata; (3) grouping the Procaridoidea with the Caridea; and (4) recognizing the Stenopodidea as a taxon related to the Reptantia rather than to the Caridea.

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