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Comparative morphology of gyrodactylus groenlandicus gyrodactylus nainum gyrodactylus pleuronecti and gyrodactylus adspersi new species monogenea from northwest atlantic fishes



Comparative morphology of gyrodactylus groenlandicus gyrodactylus nainum gyrodactylus pleuronecti and gyrodactylus adspersi new species monogenea from northwest atlantic fishes



Canadian Journal of Zoology 61(2): 417-422



G. groenlandicus from Myoxocephalus scorpius, G. nainum from M. quadricornis, G. pleuronecti from Pseudopleuronectes americanus and G. adspersi sp. nov. from Tautogolabrus adspersus, collected from the northwest Atlantic Ocean, are compared morphologically. G. groenlandicus has long hamuli (63-66 .mu.m) and long marginal hooklets (35-36 .mu.m). G. nainum and G. pleuronecti have intermediate-sized hamuli (56-58 and 55-59 .mu.m, respectively); the marginal hooklets of G. nainum are 35-36 .mu.m in length while those of G. pleuronecti are 28-29 .mu.m. G. adspersi has short hamuli (38-43 .mu.m) and short marginal hooklets (24-27 .mu.m). The 4 spp. differ subtly, but distinctly, in morphology of the marginal hooklet sickle. Possible evolutionary relationships between the 4 spp. are discussed.

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