Description of Myxidium tetraodoni Sp. Nov., Myxidium anisocapsularis Sp. Nov. and Myxobolus magai Sp. Nov. (Myxosporea: Bivalvulida) Infecting Some Freshwater Fishes in Cameroon (Central Africa)

摘要

Examination of some Teleost fishes captured in the Maga detention lake located in the Far North Region ofCameroon, revealed the presence of three new species of Myxosporidia of the genera Myxidium Bütschli, 1882 andMyxobolus Bütschli, 1882 of which complete description is given in the present study. These species are: Myxidiumtetraodoni sp. nov., parasite of the urinary bladder of Tetraodon lineatus Linnaeus, 1758 (Tetraodontidae) that formellipsoidal spores with a turgid middle part and rounded ends. They measured 11.6 (10.5-12.5) μm long × 8.2(7.2-9.6) μm broad; the spherical polar capsules are of equal size and measure 3.7 (3.0-4.3) μm. Myxidiumanisocapsularis sp. nov., a parasite of the gall bladder of Distichodus engycephalus Günther, 1964(Distichodontidae) form spindle-shaped and elongated spores, that measure 15.2 (14.0-16.2) μm long × 6.0 (5.0-6.7)μm broad; its polar capsules are quite unequal and respectively measure 6.0 (5.0-6.5) × 3.3 (3.0-3.8) μm for thelarger and 4.7 (4.0-5.5) × 3.0 (2.3-3.3) μm for the smaller. Myxobolus magai sp. nov., a gill parasite of Labeo batesiiBoulenger, 1911 (Cyprinidae) form ovoid spores with the anterior end larger with small protuberance, that measure10.6 (9.0-12.0) × 6.3 (5.5-7.0) μm. Its polar capsules measure 2.8 (2.4-3.4) × 2.3 (2.0-3.0) μm.