Myxobolus desaequalis n. sp. is described from the gill lamellae of the freshwater fish Apteronotus albifrons, collected in the Amazon River, near the city of Salvaterra, Brazil. Large spherical plasmodia filled with disporic pansporoblasts and spores were observed. Ellipsoidal to pyriform spores are 18.3 μm length × 11.2 μm width × 4.4 μm thickness. The anterior end of the spores contain two extremely unequal pyriform polar capsules measuring: (larger): 11.2 μm length, 4.9 μm width, and an isofilar polar filament with 11 to 12 turns obliquely to the longitudinal axis; (smaller): 4.6 μm length, 2.8 μm width, and an isofilar polar filament with 4 to 5 turns, obliquely to the longitudinal axis.
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Vol. 49 • No. 6