Two new species of Henneguya Thélohan, 1892 (Myxozoa, Myxobolidae), parasitic on the gills of Hoplosternum littorale (Callichthyidae) and Cyphocharax gilbert (Curimatidae) from the Guandu River, State of Rio de Janeiro, Brazil

Two new species of Henneguya (Myxozoa) were described from specimens collected on the gills of Hoplosternum littorale (Hancock, 1828) (Callichthyidae) and Cyphocharax gilbert (Quoy and Gaimard, 1824) (Curimatidae), from Guandu River, State of Rio de Janeiro, Brazil. The species described were compared with the related species of the genus. The new species of Henneguya parasitic on H. littorale has cysts with synchronous development, the spore body was 14.6 (11.4-16.7) μm long by 6.5 (4.9-7.9) μm wide. The total length of the spore was 33.6 (27.3-38.1) μm and each valve had a caudal process measuring 19.0 (15.6-22.5) μm. The larger polar capsule was 4.4 (3.35.6) μm long by 2.0 (1.6-2.3) μm wide, the smaller polar capsule was 4.1 (3.3-5.3) μm long by 2.2 (1.5-2.8) μm wide. Each polar filament with 3-6 coils. The new species of Henneguya parasitic on C. gilbert has cysts with synchronous development, the spore body was 11.3 (7.7-13.4) μm long by 4.4 (2.9-6.3) μm wide. The total length of the spore was 35.1 (29.6-44.4) μm and each valve had a caudal process measuring 23.7 (20.8-31.5) μm. The larger polar capsule was 5.2 (4.2-6.3) μm by 1.9 (1.5-2.3) μm wide, the smaller polar capsule was 4.5 (3.4-5.2) μm long by 1.7 (1.3-2.2) μm wide. Each polar filament with 7-9 coils. The characteristics of these species were compared with all the species described so far.