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

异齿龙主宰了代的最后一个时期， 即二叠纪时期，与许多起来既熟悉又… … 不熟悉的动物一起。

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.

但是某侏纪和三叠纪的形式现在普遍被认为是硬骨动物；甚至一代类型也因此被一位权威机构分类。

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.

至于活在第二纪和代的陆物，说我们的证据极零碎是多余的。

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.

凭借蜥蜴般的外观和独特的背帆，异齿龙实际上是代的吉祥物，那时候还没有花朵、鸟类、哺乳动物，甚至鳄鱼。