The study documents, for the first time, the presence of gynandry in the latest described tapeworm genus of the family Anoplocephalidae, namely the genus Hokkaidocephala Tenora, Gulyaev, Kamiya, 1999. It was confirmed that the gynandry is characteristic for two species of this genus, Hokkaidocephala apodemi (Iwaki, Tenora, Abe, Oku, Kamiya, 1994) and Hokkaidocephala sp. Both cestode species are characterized by the fact that the female reproductive system matures earlier than the male system, and the ovaries and vitelline glands are resorbed earlier than the testes. The type of uterus and its development was also different from the other genera of Anoplocephalidae. Based on this complex of features, the genus Hokkaidocephala can be easily distinguished from the related genera such as Anoplocephaloides, Paranoplocephala, Andrya, Aprostatandrya and Parandrya It is conceivable that genus Hokkaidocephala is of different lineage in subfamily Anoplocephalinae. The tapeworms of this genus, till this time, are known as the parasite of the genus Apodemus (Rodentia) in Japan.
