Molecular phylogeny of the mud lobsters and mud shrimps (Crustacea: Decapoda: Thalassinidea) using nuclear 18S rDNA and mitochondrial 16S rDNA

Invertebrate Systematics 01/2002; 16:839-847. DOI: 10.1071/IS02012

ABSTRACT Partial sequences ,of the ,18S nuclear and 16S mitochondrial ,ribosomal ,genes were obtained for 14 species of thalassinidean shrimp (families Callianassidae, Laomediidae, Strahlaxiidae, Thalassinidae and Upogebiidae) and a further six species in related decapod infraorders (families Aeglidae, Astacidae, Lithodidae, Palinuridae, Raninidae and Scyllaridae). Maximum-likelihood and Bayesian analyses show equivocal support for the monophyly of the Thalassinidea, but show strong support for division of the infraorder into two major clades. This dichotomy separates representatives in the Upogebiidae, Laomediidae and Thalassinidae from those in the Strahlaxiidae and Callianassidae. The Laomediidae is shown to be paraphyletic, with the thalassinid species, Thalassina squamifera, being placed on a branch between Axianassa and a clade comprising Jaxea and Laomedia,

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    ABSTRACT: 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.
    Crustaceana 08/2003; 76(8):935-975. · 0.47 Impact Factor
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    ABSTRACT: The genus Thalassina Latreille, 1806, is currently considered as comprising two Recent valid species: Thalassina anomala (Herbst, 1804), type species, and Thalassina squamifera De Man, 1915, and the Australian fossil Thalassina emerii Bell, 1844. The genus is widely distributed across the Indo-West Pacifi c. In the present work, Thalassina gracilis Dana, 1852, from Singapore, previously synonymised with T. anomala is revalidated, and Recent material of T. emerii from Australia and New Guinea is reported. Three new species are established, one from Singapore, Thalassina spinirostris, new species, similar to Thalassina gracilis, and two others resembling Thalassina anomala: the fi rst, Thalassina spinosa, new species, from India and Indonesia, bears several spines on the carapace and appendices; the second, Thalassina krempfi , new species from Viêt Nam, is characterized by a rostrum and a carapace that are nearly unarmed.The genus is rediagnosed and all species described and illustrated. Biological information is reviewed and a key to identifi cation is presented. Relationships of the genus Thalassina with other thalassinideans are briefl y discussed.
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    ABSTRACT: Ovigerous females of Axianassa australis were obtained from intertidal mudflats in south Texas, and eggs were hatched in the laboratory. Zoeal stages (Z) and the first postlarval stage (decapodid) were obtained, though survival rates were low. A few larvae passed through eight zoeal stages before moulting to the decapodid. Duration ranged between 3 and 4 days for each stage between ZI and ZVII, and 4 and 5 days for ZVIII, which totalled about 1 month for the entire zoeal phase of development. Three specimens that reached the decapodid stage were preserved for morphological descriptions so duration of this stage is unknown. Morphology of the first three zoeal stages and decapodid stage is described and compared with that of related thalassinideans reported in literature. As possible, comparisons are also made with larvae reared from conspecific populations in east Florida and Brazil. Biogeographic implications of the larval life history are discussed.
    Journal of Natural History 09/2005; 39(25):2289-2306. · 0.93 Impact Factor

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