, Volume 24, Issue 2, pp 129-157

A revision of Dasyrhynchus Pintner (Cestoda: Trypanorhyncha), parasitic in elasmobranch and teleost fishes

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Abstract

The genus Dasyrhynchus Pintner is revised. The adult of D. pacificus Robinson, 1965 is described from the sharks Carcharhinus brachyurus, C. obscurus, C. plumbeus, Notorhynchyus cepedianus and Sphyrna lewini from Australia, as well as from Scyliorhinus haeckeli, C. limbatus and Sphyrna sp. from Rio de Janeiro, Brazil. Bigener brownii is recorded as a new teleost intermediate host from South Australia. D. talismani Dollfus is reported for the first time from Australian waters, in C. brachyurus and new records of the species are also given for Carcharhinus sp. from South Georgia, and for an unidentified species of shark from the Gold Coast, Ghana, Africa. D. variouncinatus (Pintner) is reported for the first time from Australia, in C. amblyrhynchus, and in C. falciformis from Hawaii; it appears to be limited to the Pacific Ocean. D. giganteus (Diesing) is reported from C. leucas and Negaprion brevirostris from Florida, Rhizoprionodon (?) terraenovae from Zaire and Sphyrna sp. from Dakar, all from the Atlantic Ocean. Strobilar characters, namely the distribution of testes and the positions of the osmoregulatory canals, distinguish D. giganteus from D. variouncinatus whereas oncotaxy provides no distinguishing features. D. magnus (Bilqees & Kurshid, 1985) n. comb., formerly Pseudogilquinia magna, is reported from Sphyrna mokarran from Darwin, Northern Territory, Australia, and its plerocercus from the teleost Lutjanus johni from Queensland, Australia. The species is allocated provisionally to Dasyrhynchus pending a more complete description of the adult. D. indicus Chandra & Rao, 1986 is considered a species inquirenda. D. pillersi (Southwell, 1929) is transferred to the genus Grillotia as G. pillersi n. comb.