Dimetrodon dominated the last period of the Palaeozoic, the Permian Period, alongside many other animals that can seem at once familiar and … not.

异齿龙主宰了古生代最后一个时期， 即二叠纪时期，与许多其他看起来既熟又… … 不熟物一起。

But certain Jurassic and Triassic forms are now commonly admitted to be teleostean; and even some palaeozoic forms have thus been classed by one high authority.

但是某些侏纪和三叠纪形式现在普遍是硬骨物；甚至一些古生代类型也因此一位权威机构分类。

With respect to the terrestrial productions which lived during the Secondary and Palaeozoic periods, it is superfluous to state that our evidence is fragmentary in an extreme degree.

至于生活在第二纪和古生代陆生生物，说我们证据极其零碎是多余。

With its lizard-like appearance and that distinctive sail on it back, Dimetrodon is practically the mascot of the Palaeozoic Era, a time before flowers, birds, mammals, and even crocodiles.

凭借其蜥蜴般外观和独特背帆，异齿龙实际上是古生代吉祥物，那时候还没有花朵、鸟类、哺乳物，甚至鳄鱼。