Morphology of innominate bones (pelvic bones) of Bryde’s whales <i>Balaenoptera edeni</i>

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  • ニタリクジラ<i>Balaenoptera edeni</i>の寛骨（痕跡的骨盤）の形態
  • ニタリクジラBalaenoptera edeniの寛骨(痕跡的骨盤)の形態
  • ニタリクジラ Balaenoptera edeni ノ カンコツ(コンセキテキ コツバン)ノ ケイタイ

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Abstract

This is the first report of the morphology of innominate bones (pelvic bones) and femurs with cartilage of Bryde’s whales Balaenoptera edeni in all waters around the world. We examined morphometric features of the bones via measurement and direct observation of 34 Bryde’s whales. The innominate bones were located at approximately 71% of the body length from tip of the rostrum, and we confirmed a pair of femurs from one individual. The innominate bones had a process in the mid-lateral part, and in the anterior they were elongated toward the cranial while lacking any elongation (n = 8). Also, the bones were statistically thicker and narrower in males than females (mean values of the width/length of 0.22 (female) to 0.17 (male)), and the mid-lateral process was located more caudally in females (length anterior to mid-lateral process/length, 0.62) than males (0.51). The anterior tips of the bones were horizontally flat in females, while the males were dorso-ventrally flat. In comparison with past studies, although some common characteristics were found among other balaenopterids, the lack of elongation, and the occurrence of sexual dimorphism in the anterior tip of the bone, were found only in Bryde’s whale.

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