A white bellied right whale dolphin caught in the waters of Ibaragi, Japan

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Other Title
  • 常磐沖で捕獲されたシロハラセミイルカ
  • 常磐沖で捕獲されたシロハラセミイルカ〔外部形態・骨格計測〕
  • トキワオキ デ ホカク サレタ シロハラセミイルカ ガイブ ケイタイ コッカク ケイソク

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Description

On April 1, 1969, the fishermen of Otsu, Ibaragi Prefecture caught a so-called. white bellied right whale dolphin (Lissodelphis peroni), right whale dolphins (Lis sodelphis borealis) and white sided dolphins (Lagenorhynchus obliquidens) which had been swimming together. External and skeletal observation was done on the white bellied right whale dolphin in comparison with the ten normal right whale dolphins which had been caught at the same area. The shape and proportion of their bodies are not different. However, the color pattern of the white bellied individual showed remarkable difference. The coloration of the former was black on dorsal, white on ventral and there were black spots at the keel on the tail flukes and the tip of the snout. The lateral view was that the white area extended to the insertion of the flippers and the upper jaw through beneath the eyes. There is also a white band on the both flippers, near the insertion, and the light gray pattern on the dorsal side of the tail flukes as well as white one on the ventral side. There is no other osteological difference in this distinct specimen except the number of bones in the second digit of the flipper.

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