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A new species of Gyrodactylidae (Monogenea), Macrogyrodactylus heterobranchii n.sp. is described for the first time on a siluriform catfish of the genus Heterobranchus : H. longifilis Valenciennes, 1840 (Teleostei) in Ivory Coast (West Africa). This species can be distinguished from the other species of the genus (M. clarii and M. congolensis ) by the size of sclerotized parts of the haptor and the number of spines of the genital bulb (8-10).
Macrogyrodactylus heterobranchii n.sp., Monogenea, Heterobranchus longifilis, Siluriformes, West Africa.