Coelozoic parasite of the family Ceratomyxidae (Myxozoa, Bivalvulida) described from motile vermiform plasmodia found in Hemiodus unimaculatus Bloch, 1794

摘要: Myxozoans of the family Ceratomyxidae are common coelozoic parasites marine, anadromous, and freshwater fish, may also be found, less frequently, parasitizing tissue these hosts. The diversity ecology species genus Ceratomyxa have been poorly investigated, leading to a knowledge gap that restricts understanding distribution prevalence this group parasites. In present study, were found inside vermiform plasmodia, characterised by oscillatory movements in characiform Hemiodus unimaculatus. crescent-shaped elongated spores, perpendicular suture line, mean length 28.9 ± 2.7 μm width 2.6 ± 0.1 μm, with two symmetrical oval polar capsules, 1.9 ± 0.3 μm 1.7 ± 0.2 μm width, containing filaments three or four coils, located near central suture, lateral elongations 14.3 ± 1.1 μm binucleate amoeboid sporoplasm. integrated comparative analysis morphological characteristics partial SSU rRNA sequences supported identification new Ceratomyxa, gallbladder H. unimaculatus, from Tocantins basin, municipalities Estreito Imperatriz eastern Brazilian Amazonia.The was denominated fonsecai n. sp.