腔棘鱼是一种罕见的鱼，相较常见的辐鳍鱼，它们与肺鱼、爬行动物甚至哺乳动物才是近亲。
A rare order of fish , coelacanths are more closely related to lungfish , reptiles and even mammals than to common ray-finned fish .
辐鳍鱼