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A new hypothesis of decapod phylogeny

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image of Crustaceana

A cladistic analysis based on external morphology was carried out on 60 taxa of decapod crustaceans. An analysis with unordered characters and one with ordered characters were both in agreement regarding the major relationships. The ordered analysis gave better resolution of more advanced clades, while the unordered analysis gave better resolution of more basal clades. None of the traditional groups Palinura, Anomura, and Macrura is monophyletic. A new classification of decapod crustaceans is proposed. Homarida and Astacida are closely related, as shown by the unique process on the ischium of their first pereiopods. Glypheoidea forms the sister group to Astacura, within an enlarged Astacidea. Achelata is the sister group to Meiura (Anomala + Brachyura) in a new clade, Eurysternalia, characterized by a unique antennular morphology and by the eponymous wide sternum of its members. Thalassinida emerge as the sister group to Eurysternalia, in a new clade, Sterropoda, characterized by fusion of the first segments of the thoracic limbs. The fractostern is interpreted to be a eureptant feature, and a possible burrowing habitus is posited for the ancestral Eureptantia.

Une analyse cladistique fondée sur la morphologie externe a été menée sur 60 taxons de Crustacés Décapodes. Les deux analyses, l'une utilisant les caractères non ordonnés, l'autre les caractères ordonnés étaient toutes les deux en accord sur les principales relations. L'analyse ordonnée a présenté une meilleure résolution des clades les plus avancés, tandis que l'analyse non ordonnée a donné une meilleure résolution des clades plus basaux. Aucun des groupes traditionnels Palinura, Anomura et Macrura n'est monophylétique. Une nouvelle classification des Crustacés Décapodes est proposée. Les Homarida et les Astacida sont étroitement apparentés, comme déjà montré par le processus unique sur l'ischium de leurs premiers péréiopodes. Les Glypheoidea constituent le groupe-frère des Astacura, à l'intérieur du groupe élargi des Astacidea. Les Achelata sont le groupe-frère des Meiura (Anomala + Brachyura) dans un nouveau clade, Eurysternalia, caractérisé par une morphologie unique de l'antennule et par le large sternum éponyme de ses membres. Les Thalassinida émergent comme le groupe-frère des Eurysternalia, au sein d'un nouveau clade, les Sterropoda, caractérisé par la fusion des premiers segments des appendices thoraciques. Le fractosterne est interprété comme un caractère de vrai rampant , et un habitus fouisseur possible est supposé pour l'Eureptantia ancestral.

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/content/journals/10.1163/156854003771997846
2003-09-01
2016-12-06

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