And Camptostroma was paving the way for the echinoderms we see today.

Camptostroma 为我们今天看到的棘皮动物铺平了道路。

This researchers say that this finding is likely to apply to other echinoderms as well.

研究人员表示，这一发现也可能适用于其他棘皮动物。

It had the five-part symmetry common to all modern echinoderms.

它具有所有现代棘皮动物共有的五部分对称性。

Either way, the Paleozoic Era continued to be dominated by the crinoids and other echinoderms.

无论哪种方式，古生代继续由海百合和其他棘皮动物统治。

Echinoderms were hit hard and whole groups went extinct.

棘皮动物受到重创，整个群体都灭绝了。

Paleontologists also now have more information to go back and study the many strange fossils of echinoderms and their relatives.

古生物学家现在也有了更多的信息，可以回去研究许多奇怪的棘皮动物及其近亲化石。

All modern echinoderms start their lives as swimming larvae with bilateral symmetry and then settle on a substrate to transform.

所有现代棘皮动物都以双侧对称的游泳幼虫开始它们的生活，然后定居在基质上进行转化。

But why did some echinoderms become radially symmetric and develop this new body plan in the first place?

但是，为什么一些棘皮动物首先会变得呈放射状对称并发展出这种新的身体结构呢？

This makes Ctenoimbricata one of the first for-sure echinoderms.

这使得 Ctenoimbricata 成为首批确定的棘皮动物之一。

The left side grows into five parts, while the right side gets absorbed, and we end up with an adult radial echinoderm.

左侧长成五个部分，而右侧被吸收，我们最终得到了成年桡骨棘皮动物。