Limb articulation in caridoid crustaceans revisited - new evidence from Euphausiacea (Malacostraca) |
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| Authors: | Haupt Christian Richter Stefan |
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| Affiliation: | 1. Institut für Spezielle Zoologie und Evolutionsbiologie, Friedrich-Schiller-Universität Jena, Erbertstrasse 1, 07743 Jena, Germany;2. Allgemeine & Spezielle Zoologie, Institut für Biowissenschaften, Universität Rostock, Universitätsplatz 2, 18055 Rostock, Germany;1. Laboratory of Systematic Zoology, Department of Biology, Faculty of Sciences, Tokyo Metropolitan University, Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan;2. Ozakudai 3-7-15, Hamura-shi, Tokyo 205-0001, Japan;3. Shibamata 5–17–10, Katsushika-ku, Tokyo 125-0052, Japan;4. Department of Biology, Faculty of Science, Toho University, Miyama 2-2-1, Funabashi, Chiba 274-8510, Japan;5. Sayamadai 2–21–18, Sayama-shi, Saitama 350-1304, Japan;1. Animal Evolution & Development, Institute of Biology, University of Leipzig, Talstraße 33, D-04103 Leipzig, Germany;2. Vertebrate Zoology Department, Biological Faculty, Lomonosov Moscow State University, Leninskiye Gory, Moscow 119991, Russia;3. Zoological Museum of Moscow University, Bolshaya Nikitskaya st. 6., Moscow 125009, Russia;4. Joint Vietnamese-Russian Tropical Centre, Street 3/2 N 3, 10 District, Ho Chi Minh City, Vietnam;5. A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Science, Leninsky Prosp. 33, Moscow 119071, Russia;6. Senckenberg Natural History Collections, Museum of Zoology, Königsbrücker Landstraße 159, D-01109 Dresden, Germany;7. Zoologisches Forschungsmuseum Alexander Koenig, Sektion Herpetologie, Adenauerallee 160, D-53113 Bonn, Germany;8. Biozentrum Grindel and Zoological Museum, University of Hamburg, Martin-Luther-King-Platz 3, D-20146 Hamburg, Germany;1. Max Planck Weizmann Center for Integrative Archaeology and Anthropology, Leipzig, Germany;2. Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany;3. Institute of Systematic Zoology and Evolutionary Biology with Phyletic Museum, Friedrich-Schiller-University Jena, Jena, Germany;4. Department of Bioinformatics, Friedrich-Schiller-University Jena, Jena, Germany;5. Stuttgart Research Centre for Simulation Technology (SimTech), Universität Stuttgart, Stuttgart, Germany;6. Institute of Applied Mechanics (CE), Chair of Continuum Mechanics, Universität Stuttgart, Stuttgart, Germany;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China;2. University of Science and Technology of China, Hefei 230026, China;3. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;4. Department of Earth Sciences, Natural History Museum, London SW7 5BD, UK;5. Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Science, Beijing 100101, China;1. KU Leuven, Zoological Institute, Naamsestraat 59, Box 2466, 3000 Leuven, Belgium;2. Sorbonne Université, CNRS, Institut d’Écologie et des Sciences de l’Environnement, 75005 Paris, France |
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| Abstract: | The propodial articulation of thoracopods in Malacostraca is revisited. Two major joints at the base of the limb, a thorax-coxa joint and a coxa-basis joint permit promotion-remotion and abduction-adduction, respectively. In representatives of Decapoda, Anaspidacea and Euphausiacea, the coxa forms proximally a dicondylic articulation with the thorax, permitting promotion-remotion, and distally another dicondylic joint with the basis, permitting abduction-adduction. In Lophogastrida and Mysida, the thorax-coxa hinge line is antero-posteriorly oriented, as is the coxa-basis hinge line. Promotion-remotion in Mysida and Lophogastrida is possible because of the presence of an intrabasal joint which is also present in Euphausiacea and Anaspidacea. In Mysida, Lophogastrida and Euphausiacea, the intrabasal joint is only present anteriorly, just distally of the anterior coxa-basis joint between a small, triangular proximal part of the basis and a larger distal part. In Anaspidacea, the intrabasal joint is also present posteriorly and permits abduction-adduction. Homology with the intrabasal joint of the other taxa seems doubtful. Limb articulation in Anaspidacea shows, nevertheless, correspondences with that in Euphausiacea, Lophogastrida and Mysida: the coxa is posteriorly invaginated and has an open ring-like structure very different from the solid coxa in decapods. Despite the high level of structural correspondence between the intrabasal joint in Euphausiacea and that in Lophogastrida and Mysida, their different functional roles make homology implausible. In Lophogastrida and Mysida the intrabasal joint is thought to replace the promotion-remotion movement of the thorax-coxa articulation, which in these taxa permits abduction-adduction only, probably in connection with the evolution of the marsupium. In Euphausiacea, the intrabasal joint might play a role in feeding mechanisms. Neither the feeding basket nor a marsupium can reasonably be suggested for any common ancestor of Euphausiacea and Mysidacea (or Peracarida). |
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