Foregut morphology and ontogeny of the mud crab Dyspanopeus sayi (Smith, 1869) (Decapoda,Brachyura, Panopeidae) |
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| Institution: | 1. IRTA, Aqüicultura, Cultius Aqüàtics, Ctra. Poble Nou, Km 5.5, 43540 Sant Carles de la Ràpita, Tarragona, Spain;2. Departament de Biologia Cellular, Facultat de Biologia, Universitat de Barcelona, Av. Diagonal, Barcelona, Spain;3. Institut de Ciències del Mar, CSIC, Passeig Marítim de la Barceloneta, 37-49, 08003 Barcelona, Spain;4. Passeig de Fabra i Puig, 344, 08031 Barcelona, Spain;1. Ernst-Moritz-Arndt-Universität Greifswald, Zoologisches Institut und Museum, Abteilung Cytologie und Evolutionsbiologie, Soldmannstr. 23, D-17487 Greifswald, Germany;2. Universität Rostock, Institut für Biowissenschaften, Lehrstuhl für Allgemeine & Spezielle Zoologie, Universitätsplatz 2, D-18051 Rostock, Germany;3. Universität Duisburg-Essen, Universitätsklinikum Essen, Zentrales Tierlaboratorium, Hufelandstr. 55, D-45122 Essen, Germany;1. Department of Anatomy, Arizona College of Osteopathic Medicine, Midwestern University, USA;2. School of Human Evolution and Social Change, Arizona State University, USA;3. Department of Anthropology, University at Buffalo, SUNY, Buffalo, NY, USA;1. Norwegian University of Science and Technology, Department of Psychology, Neuroscience Unit, 7491 Trondheim, Norway;2. Sechenov Institute of Evolutionary Physiology and Biochemistry of the Russian Academy of Sciences, Pr. Torez 44, 194223 Saint-Petersburg, Russia;1. Department of Entomology, Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia;2. Department of Psychology and Neuroscience, Life Sciences Centre, Dalhousie University, Halifax, Nova Scotia, Canada |
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| Abstract: | The morphology of the foregut of the Say's mud crab Dyspanopeus sayi was described in adults and larvae. The ossicle system was illustrated based on a staining method with Alizarin-Red. The gastric teeth and cardio-pyloric valve were dissected and examined using optical and scanning electron microscopy. In the adults, the morphology of ossicles and gastric teeth of D. sayi is very similar to the related species Rhithropanopeus harrisii. The foregut of first zoea (ZI) presented a functional cardio-pyloric valve while the filter press was lacking. The filter press was observed in the pyloric chamber from ZII. The most significant changes in morphology take place after metamorphosis from ZIV to megalopa, including the occurrence of the gastric mill. The organization and morphology of many megalopal foregut ossicles are recognizable in the adult phase, although the morphology of the gastric teeth differs from the morphology of adults. A correlation of gastric mill structures with food preferences and their contribution to the phylogeny are briefly discussed. |
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| Keywords: | Foregut ossicles Alizarin Red Ontogeny Brachyura |
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