Seven new species of Quadriacanthus Paperna, 1961 (Monogenea) from the gills of Heterobranchus longifilis and H. isopterus from the Ivory Coast, West Africa

The gills of two species of Siluriformes, Heterobranchus longifilis and H. isopterus collected from the Rivers Agneby and Bia in the Ivory Coast (West Africa) revealed the presence of seven new species of Quadriacanthus Paperna, 1961 (Monogenea: Ancyrocephalidae). The following parasites are described: Quadriacanthus longifilisi n. sp., Q. thysi n. sp., Q. ayameensis n. sp., Q. agnebiensis n. sp., Q. simplex n. sp., Q. gourenei n. sp. and Q. macrocirrus n. sp.