中国动物志兽纲第八卷

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中国动物志兽纲第八卷

作者: IBSN: 丛书: 《《中国动物志 兽纲》第八卷》 出版时间:
本科包括海狮类和海狗类,后鳍肢能够向前转到体下面,在陆上的运动能力较强;前鳍肢长而扁,能在游泳时提供推力;后鳍肢中央3个趾的趾甲发达,外侧2个趾甲痕迹状;耳廓小;额骨眶上突发达且呈搁板状,在雄成体尤其明显;具翼蝶管;乳突骨大,与颧突相愈合;下门齿4枚;前2枚上门齿具横沟;通常共有20~22枚后犬齿;睾丸在阴囊内。最早的海狮科化石采自早晚中新世(11 MY)。觋生的全球7属16种,中国2属2种。Phocadae Gray,1821,London Medical Repository,15(1):302.;海豹类的后鳍肢不能向前转到体下面,陆上的运动能力较差;前鳍肢较短,不能在游泳时提供推力;......