ABSTRACT. – Parasitological survey of the gill filaments of Anaspidoglanis macrostoma and Parauchenoglanis monkei (Claroteidae) from the Memou’ou, a River Nyong tributary in South Cameroon, revealed the presence on these hosts of Quadriacanthus anaspidoglanii n. sp. and Bagrobdella parauchenoglanii n. sp., respectively. Quadriacanthus anaspidoglanii n. sp. is differentiated from other congeneric species by the size of haptoral parts and male copulatory complex. Bagrobdella parauchenoglanii n. sp. differs from other congeneric species by the shape and size of the male copulatory complex (not coiled penis, presence of an accessory piece). The presence of a Quadriacanthus species on an Auchenoglanidinae host (usually parasitized by monogeneans belonging to Bagrobdella) is recorded for the first time and suggests that it could be the results of a lateral transfer between hosts from these two different Siluriforme families (Clariidae and Claroteidae), living in sympatry.