…This family and the Narwhalidae family appear to have been derived from a group close to the Delphinidae. In the Mysticeti baleen whales, the posterior edge of the main part of the jaw bone remains in front of the orbit and does not cover the back of the skull. The nostrils are located at the base of the snout and open to the outside of the body by two holes. … *Some of the terminology that mentions "Mysticeti" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…本科とイッカク科は,マイルカ科に近いグループから派生したらしい。 ヒゲクジラ(鬚鯨)類Mysticetiでは,顎骨の主要部は後縁が眼窩(がんか)前方にとどまり,頭骨背面を覆わない。鼻孔は吻の基部背面に位置し,体外に2孔が開口する。… ※「Mysticeti」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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