As far as paleontologists know, this was the last temnospondyl ever to grace the earth.

据古生物学家所知，这是最后一只出现在地球上的腾龙。

Yet in the end, two major threats would push the temnospondyls—including the resilient Koolasuchus—to extinction.

然而，最终，两大威胁将迫使穿椎龙——包括适应力强的库拉鳄——走向灭绝。

On land, there were the amphibian-like temnospondyls and early relatives of mammals called therapsids.

在陆地上，有类似两栖动物的 temnospondyls 和哺乳动物的早期近亲，称为 therapsids。

But many temnospondyl species were covered in scales.

但是许多 temnospondyl 物种被鳞片覆盖。

That's where the little, twenty-centimeter Balanerpeton became the first known temnospondyl to appear in the fossil record.

这就是 20 厘米长的小 Balanerpeton 成为第一个出现在化石记录中的已知 temnospondyl 的地方。

And aquatic temnospondyls weren't limited to freshwater.

水生 temnospondyls 并不局限于淡水。

Gradually, the remaining freshwater and marine temnospondyls found themselves displaced.

渐渐地，剩余的淡水和海洋 temnospondyls 发现自己流离失所。

Ocean-dwelling amphibians don't exist today, but fossils of temnospondyls have been found in marine deposits.

今天不存在海洋栖息的两栖动物，但在海洋沉积物中发现了 temnospondyls 的化石。

Temnospondyls were a huge group of amphibians that existed for 210 million years.

Temnospondyls 是一大群两栖动物，存在了 2.1 亿年。

By the early Cretaceous, the temnospondyls had vanished from every continent.

到白垩纪早期，temnospondyls 已经从每个大陆上消失了。

Maybe the temnospondyls gave rise to them, and maybe they didn't.

可能是速椎龙产生了它们，也可能不是。

And some paleontologists think that some or all of the lissamphibians are descended from the dissorophoids, that group of smaller temnospondyls.

一些古生物学家认为， 一些或所有的软体动物都起源于双足动物，即一组较小的突椎动物。

Unlike the temnospondyls, these early amniotes were free to reproduce far from the water, by laying eggs with protective shells, which were probably more leathery than mineralized.

与穿椎动物不同， 这些早期的羊膜动物可以在远离水的地方自由繁殖，它们产下带有保护壳的卵，这些卵可能比矿化的更坚韧。

And Dimetrodon was among a group of ascendant animals that would turn out to have a distinct advantage over the temnospondyls, as the climate began to change.

随着气候开始发生变化，异齿龙是一群优势明显的动物之一，最终证明它们比穿椎动物具有明显的优势。

So, we don't know what the common ancestor of all temnospondyls was, but based on the anatomy of these two early species, scientists think it was probably terrestrial.

所以， 我们不知道所有穿椎龙的共同祖先是什么，但根据这两个早期物种的解剖结构，科学家们认为它可能是陆生的。

On a warm evening, when you hear frogs croaking and chirping, you just might be listening to the living successors of Koolasuchus and the other temnospondyls joining their voices in chorus.

在一个温暖的夜晚， 当您听到青蛙的呱呱叫声时，您可能正在聆听 Koolasuchus 的现存继承者和其他腾椎龙合唱。