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Geographic variation in the skull morphology of the finless porpoise was studied with special refer ence to identifying local populations in Japanese waters. Twenty-five skull characters were measured for 146 specimens. These specimens were divided into five samples on the basis of available distribution al information: 1) from Sendai Bay to Tokyo Bay, 2) Ise Bay and Mikawa Bay, 3) Inland Sea and the ad jacent waters, 4) Omura Bay, 5) Ariake Sound and Tachibana Bay. Morphological differences were ex amined by the analysis of covariance and canonical discriminant analysis. The skull morphology varied among the samples. The porpoises in Ise Bay and Mikawa Bay possessed rather narrow skulls. There was no evidence that skull morphology was more similar between geographically close areas. Such geo graphic variation suggests that porpoises in each area rarely intermingle. We considered that there are at least five local populations in Japanese waters.

Geographic Variation in the Skull Morphology of the Finless Porpoise <i>Neophocaena phocaenoides</i> in Japan Waters