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Fine Structure of the Plasmodia and Myxospore of Ellipsomyxa gobioides n. sp. (Myxozoa) Found in the Gallbladder of Gobioides broussonnetii (Teleostei: Gobiidae) from the Lower Amazon River

Authors

  • Carlos Azevedo,

    Corresponding author
    1. Lab of Pathology, Interdisciplinary Centre for Marine and Environmental Research (CIIMAR/UP), University of Porto, Porto, Portugal
    2. Zoology Department, College of Science, King Saud University, Riyadh, Saudi Arabia
    • Department of Cell Biology, Institute of Biomedical Sciences (ICBAS/UP), University of Porto, Porto, Portugal
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  • Marcela Videira,

    1. Carlos Azevedo Research Lab, Federal Rural University of Amazonia, Belém, Brazil
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  • Graça Casal,

    1. Department of Cell Biology, Institute of Biomedical Sciences (ICBAS/UP), University of Porto, Porto, Portugal
    2. Lab of Pathology, Interdisciplinary Centre for Marine and Environmental Research (CIIMAR/UP), University of Porto, Porto, Portugal
    3. Department of Sciences, High Institute of Health Sciences-North, CESPU, Gandra, Portugal
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  • Patrícia Matos,

    1. Edilson Matos Research Lab, Federal University of Pará, Belém, Brazil
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  • Elsa Oliveira,

    1. Department of Cell Biology, Institute of Biomedical Sciences (ICBAS/UP), University of Porto, Porto, Portugal
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  • Saleh Al-Quraishy,

    1. Zoology Department, College of Science, King Saud University, Riyadh, Saudi Arabia
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  • Edilson Matos

    1. Carlos Azevedo Research Lab, Federal Rural University of Amazonia, Belém, Brazil
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Correspondence C. Azevedo, Department of Cell Biology, Institute of Biomedical Sciences, University of Porto, Rua Jorge Viterbo Ferreira, no. 228, 4050-313 Porto, Portugal Telephone number: +351 22 042 8241; FAX number: +351 22 206 2232; e-mail: azevedoc@icbas.up.pt

Abstract

A fish infecting myxosporean Ellipsomyxa gobioides n. sp. is described in the gallbladder of the Amazonian dragon fish Gobioides broussonnetii. Irregular disporous plasmodia (up to ~30 μm in diameter) with long branched and anastomosed pseudopodia were found attached to the gallbladder wall. Mature ellipsoid myxospores occurring floating in the bile measured 6.8 (6.5–7.0) μm (n = 30) long, 7.2 (6.9–7.5) μm (n = 15) wide, and 13.1 (12.8–13.5) (n = 25) thick. They had smooth thin valves elongated in the direction perpendicular to the plane of the straight central transverse sutural line. The two ellipsoidal polar capsules (PC) opened some distance from the sutural line on opposite sides, each measuring 4.6 (4.3–4.8) μm (n = 15) long and 2.5 (2.1–2.7) μm (n = 20) wide. Distance between PC 3.5 (3.1–3.8) μm (n = 15) in apical view. The polar filament was isofilar and consisted of a single coil with five or six turns. The objective of this study was to characterize this new species based on its morphological differences from the three previously described species. This is the first reported species of genus Ellipsomyxa from among the South American fauna.

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