Rhadinorhynchidae has 4 subfamilies (Golvanacanthinae, Gorgorhynchinae, Rhadinorhynchinae, and Serrasentoidinae) and the following species:[2][a] Golvanacanthus Paggi and Orecchia, 1972 contains one species: Australorhynchus Lebedev, 1967 Cleaveius Subrahmanian, 1927 Edmondsacanthus Smales, 2009 Gorgorhynchus Chandler, 1934 G. occultus has been found parasitising the Cobbler wobbegong (Sutorectus tentaculatus) in Bunbury, Western Australia.

[3] Leptorhynchoides Kostylev, 1924 Metacanthocephaloides Yamaguti, 1959 Metacanthocephalus Yamaguti, 1959 Micracanthorhynchina Strand, 1936 Paracanthorhynchus Edmonds, 1967 Pseudauchen Yamaguti, 1963 Pseudoleptorhynchoides Salgado-Maldonado, 1976 Cathayacanthus Golvan, 1969 Megistacantha Golvan, 1960 Paragorgorhynchus Golvan, 1957 Pseudogorgorhynchus Moravec, Wolter & Korting, 2000 Raorhynchus Tripathi, 1959 Rhadinorhynchus Lühe, 1911 R. decapteri is a parasite of the marine fish Round scad (Decapterus punctatus) and is found coastal waters of Brazil.

[8] R. mariserpentis parasitizes the Oarfish, Regalecus russelii and has been collected near Wakamatsu-ku, Kitakyūshū, Japan.

On the South pacific coast of Vietnam, it was found infesting the Frigate tuna (Auxis thazard), and the Torpedo scad (Megalaspis cordyla).

[13] Slendrorhynchus Amin & Sey, 1996 Serrasentoides Parukhin, 1971 Rhadinorhynchidae species parasitize fish hosts.