Fine structure of the microsporidan Abelspora portucalensis gen.n., sp.n. (Microsporida) parasite of the hepatopancreas of Carcinus maenas (Crustacea,Decapoda) |
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| Affiliation: | 1. Department of Cell Biology, Institute of Biomedical Sciences, University of Oporto, 4000 Porto, Portugal;2. Center of Experimental Morphology, University of Oporto, 4000 Porto, Portugal;1. Stowers Institute for Medical Research, Kansas City, MO, USA;2. Howard Hughes Medical Institute, Stowers Institute for Medical Research, Kansas City, MO, USA;3. Department of Medical and Surgical Sciences, University of Modena and Reggio Emilia, Modena, Italy;4. Department of Surgery, Medicine, Dentistry and Morphological Sciences, University of Modena and Reggio Emilia, Modena, Italy;5. Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy;1. Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste, Sargento Cabral 2131 C.P. (3400) Corrientes, Argentina;2. Graduate School of Bioresources, Mie University, 1577 Kurima-machiya, Tsu, Mie 514-8507, Japan;1. Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand;2. Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan;3. Center of Excellence on Bioresources for Agriculture, Industry and Medicine, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand;1. University of Guelph, School of Environmental Sciences, Guelph, ON, Canada;2. University of Guelph, Department of Integrative Biology, Guelph, ON, Canada;3. Aquatic Contaminants Research Division, Water Science and Technology Directorate, Environment and Climate Change Canada, Burlington, ON, Canada |
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| Abstract: | A new species of a microsporidan, Abelspora portucalensis, was found in the hepatopancreas of Carcinus maenas, forming white xenomas. Each xenoma seems to consist of an aggregate of hypertrophic host cells in which the parasite develops and proliferates. This cytozoic microsporidan being characterized by one uninucleate schizont giving rise to two sporonts, each originating two sporoblasts, resulting in two spores within a persistent sporophorous vacuole (pansporoblast) should be included in a new family Abelsporidae. In fresh smears most spores were 3.1–3.2 μm long and 1.2–1.4 μm wide. Fixed, stained, and observed in SUS mature spores measured 3.1 ± 0.08 × 1.3 ± 0.06 μm (n = 25 measurements). Spore cytoplasm was dense and granular, polyribosomes were arranged in helicoidal tape form. The polar filament was anisofilar and consisted of a single coil with 5–6 turns. The anchoring disc and and the anterior zone of the filament are surrounded by the polaroplast composed of two usual zones. In the anterior zone, the membrane of the polar filament is in continuity with the membranes of the polaroplast. The appearance of a microsporidan with described nuclear divisions in life cycle, spores shape and size, polaroplast and polar filament morphology and identity of the host suggests that we may erect a new genus Abelspora and a new species A. portucalensis (Portugal = Portucalem). |
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