During the process of the recent description of a new balaenopterid species, the Omura’s whale, Balaenoptera omurai Wada, Oishi et Yamada, 2003, the authors proposed to separate the so-called “Bryde’s whale”, Balaenoptera edeni Anderson, 1878/9 into the Eden’s whale, B. edeni and Bryde’s whale (s.s.), Balaenoptera brydei Olsen, 1913. In their project of the investigation on the middle sized balaenopterid whales in Taiwan and Thailand, the authors confirmed many specimens classified into the three species. In addition to the characteristics on the vertex of the skull, the morphology of the lateral surface of the braincase around the alisphenoid has been clarified to be available for distinction among the three species according as the specimens for comparison increase. The balaenopterid specimens, formerly reported as the so-called “Bryde’s whale”, B. edeni which are preserved in the Wakayama Prefectural Museum of Natural History (Wakayama specimen) and Kitsuki City Library in Oita Prefecture (Kitsuki specimen), are judged to be assignable to the Eden’s whale, B. edeni based on the comparison of the vertex and alisphenoid morphology of the formerly described specimens including the holotype of B. edeni.
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