Morphological Studies on the Diphyllobothriid Tapeworms from Killer Whale, <i>Orcinus orca</i>(Linnaeus, 1758)and Bottlenose Dolphin, <i>Tursiops truncatus</i>(Montague, 1821)

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  • シャチとバンドウイルカより得られた裂頭条虫の形態について

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Strobilae having no scolex of diphyllobothriid tapeworms were found from both a killer whale, Orcinus orca captured off the Kii Peninsula, Japan and a bottlenose dolphin, Tursiops truncatus born in a sea water pool of Taiji Whale Museum. These animals have been artificially maintained in the sea water pool for several years. Two kinds of strobilae obtained appeared to be identical species of diphyllobothriid tapeworms morphologically, and the strobila from T.truncatus was considered in somewhat immature from. The strobilae in the present study were identified as Diphyllobothrium fuhrmanni Hsü 1935 based on morphological characteristics of transverse and sagittal sections of segments and the eggs despite lack of the scolex. Two marine mammals, Orcinus orca and Tursiops truncatus are the new record of natural definitive host for D.fuhrmanni. Moreover, the authors also mentioned this important point in regard to the marine mammalian sources of infection.

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