This growth spurt might have initially occurred because some pelycosaurs were adapting to herbivory.

这种生长突增最初可能是因为一些盘龙正在适应食草动物。

Pelycosaurs were some of the first terrestrial vertebrates to start eating plants.

盘龙是最早开始吃植物的陆生脊椎动物之一。

Plant-eating pelycosaurs were also adapting more specialized teeth and jaws that could crush, grind, and shred vegetation.

以植物为食的盘龙也在适应更特殊的牙齿和下颚，可以压碎、研磨和切碎植物。

This rotund, barrel-like belly is on full display in the early herbivorous pelycosaur Cotylorhynchus, whose body dwarfed its tiny head.

这种圆形的桶状腹部在早期食草性盘龙类 Cotylorhynchus 身上得到了充分展示，它的身体使它的小脑袋相形见绌。

In fact, Pelycosaurs were some of the first-ever large land animals, with species ranging from 3 meters to 6.5 meters in length.

事实上， 盘龙是有史以来最早的大型陆生动物之一，体长从 3 米到 6.5 米不等。

Pelycosaurs needed an environment that was consistently warm and humid in order to survive, and they weren't equipped to handle the transition.

Pelycosaurs 需要一个持续温暖和潮湿的环境才能生存，而且它们没有能力应对这种转变。

And this early group of reptile-looking synapsids, known informally as Pelycosaurs, quickly radiated to fill many different niches on land, including some that had never been filled before.

这群早期的爬行动物长相合弓类动物，被非正式地称为盘龙类， 迅速辐射到陆地上许多不同的生态位，包括一些以前从未被填充过的生态位。