[1] Occasionally found in cetaceans, the role of these apex predators in the tetraphyllidean life cycle is not well known; whales and dolphins may be definite or dead-end hosts.

[2] C. antonioi was recovered from the spiral intestine of N. cepedianus and named after the lead researcher's father, Antonio Ivanov.

[2] Its proglottids, which are the segments of tapeworms that contain the reproductive structures, are longer than wide when immature, and become wider than long at maturity.

[2] C. antonioi also have crenulated bothridial margins and a microthrix pattern that varies from other species in Crossobothrium.

[2] The most notable and unique quality of C. antonioi is the large amount of testes per mature proglottid.