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Meglitschia spp.(Myxozoa) Infecting the Gallbladder of Eugerres Brasilianus (Teleostei: Gerreidae) from the Atlantic Coast of Maceió (Brazil)


Journal of Microbiology & Experimentation
Themis Silva, Centre of Agricultural Sciences, Federal University of Alagoas, Brazil
Emerson Soares, Centre of Agricultural Sciences, Federal University of Alagoas, Brazil
Sónia Rocha, Institute of Biomedical Sciences, University of Porto, Portugal
Elton Santos, Centre Interdisciplinary for Marine and Environmental Research (CIIMAR/UP), University of Porto, Portugal
Elsa Oliveira, Institute of Biomedical Sciences, University of Porto, Portugal
Graça Casal, Centre of Agricultural Sciences, Federal University of Alagoas, Brazil
Carlos Azevedo, Institute of Biomedical Sciences, University of Porto, Portugal

Abstract

Microscopic observations using light and transmission electron microscopes are used to describe a myxosporean belonging to the genus Meglitschia Kovaleva, 1988 (Phylum Myxozoa Grassé, 1970 found infecting the gallbladder of the marine teleost fish Eugerres brasilianus (Gerreidae) collected on the NE Atlantic coast of Brazil. Typical ellipsoidal furcate and arcuate ∩-shaped myxospores, identified as belonging to the genus Meglitschia were found infecting the gallbladder and described using light and transmission electron microscopy. Mature myxospores are composed of two symmetric equal-sized valves, with two equal-sized bifurcated caudal processes (tails). The myxospores observed free in the bile measures 24.6±0.8μm long, 8.4±0.5μm wide and 5.1±0.3μm thick and are composed of two symmetric equal-sized valves, up to ~65 nm thick. Each valve possesses one opposed tapering appendage, 19.6±0.7 µm long, oriented parallel towards the basal tip of the appendages and joined along a right suture line forming a thick strand. Two spherical and equal-sized polar capsules are located side by side in the same level in the central region of the myxospores body. Each polar capsule contains a polar filament coiled in 4-5 turns. Sporoplasm is binucleated and contains the nucleus just near the polar capsules surrounded by several globular sporoplasmosomes. The sporoplasm occupies the internal portion basal of the two caudal processes. 

Keywords

Myxozoa, Marine, Fish infecting, Gallbladder, Ultrastructure, Meglitschia, Freshwater, Microscopies, Morphologic, Cacodylate, Dehydrated, Ultrathin, Embedding, Morphology, Glutaraldehyde

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