Fig. 14From: Quadriacanthus species (Monogenea: Dactylogyridae) from catfishes (Teleostei: Siluriformes) in eastern Africa: new species, new records and first insights into interspecific genetic relationshipsPhase-contrast photomicrographs of the sclerotized structures of Quadriacanthus mandibulatus n. sp. a Haptoral structures. b Male copulatory organ. Scale-bars: a, 30 μm; b, 20 μmBack to article page