Copulation of Opisthogonimus fonsecai Ruiz & Le？o, 1942 (Trematoda, Digenea, Plagiorchiidae), parasite of Bothrops moojeni Hoge, 1966 (Serpentes, Viperidae)

copulation in opisthogonimus fonsecai ruiz & le？o, 1942 (trematoda, digenea, plagiorchiidae), parasite of bothrops moojeni hoge, 1966 (serpentes, viperiade), was reported. data on the histology of the cirrus and metraterm of the copulants were presented. morphology of the cirrus was also examined by scanning electron microscopy.