Unlike other anurans with internal fertilization, however, mating in A. truei consists of a unique combination of amplectic and copulatory mechanisms that we term "copulexus". -- David M. Sever, Emily C. Moriarty, Lisa C. Rania and William C. Hamlett, 2001, "Sperm storage in the oviduct of the internal fertilizing frog Ascaphus truei", Journal of Morphology 248: 1
Unlike other anurans with internal fertilization, however, mating in A. truei consists of a unique combination of amplectic and copulatory mechanisms that we term "copulexus".
-- David M. Sever, Emily C. Moriarty, Lisa C. Rania and William C. Hamlett, 2001, "Sperm storage in the oviduct of the internal fertilizing frog Ascaphus truei", Journal of Morphology 248: 1
(See amplexus).