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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI: https://doi.org/10.3354/dao03691

    Myxobolus makombensis n. sp. infection in African carp Labeobarbus batesii from Makombè River, Cameroon: morphological and molecular characterization

    Bienvenu Feudjio-Dongmo, Guy Benoît Lekeufack-Folefack, Billy Tene-Fossog, Abraham Fomena, Charles S. Wondji, Violetta M. Yurakhno, Suliman Alomar, Lamjed Mansour*

    *Corresponding author:

    ABSTRACT: In this study, we examined myxozoan infections of Labeobarbus batesii sampled from the Makombè River in Cameroon. Fish were infected with Myxobolus makombensis n. sp. in the gill filament and M. dibombensis in the fins. Mature myxospores of M. makombensis n. sp. are pyriform in frontal view and biconvex in lateral view, with truncated and slightly narrow anterior end. Spores are 17.5 ± 0.22 (16.2 – 18.9) μm long, 13.4 ± 0.25 (12 – 14.9) μm wide, and 7 ± 0.21 (6.7 – 7.5) μm thick and exhibit a conspicuous anterior intercapsular appendix of 4.4 ± 0.18 (3.9 – 5.5) µm length. Myxospores have 2 pyriform and unequal size polar capsules, the larger one is 9.8 ± 0. 22 (8.2 – 10.9) μm in length × 4.7 ± 0.15 (3.5 – 5.2) µm in width and the smaller one is 8.8 ± 0.22 (7 – 10) µm in length × 4.3 ± 0.12 (3.5 – 5.2) µm in width. Polar filaments coiled 10 to 11 turns in the large polar capsule and 8 to 10 turns in the small polar capsule. Phylogenetic analysis of the SSU rDNA sequences shows clustering of M. makombensis n. sp. close to M. dibombensis that we have recently reported from the fins of the same host within a clade composed exclusively of parasites infecting cyprinid fishes.