See, priapulids have heads that are lined with tiny barbs.

看，priapulids 的头上排列着小倒钩。

Priapulids also became more common in the Cambrian.

Priapulids 在寒武纪也变得更加普遍。

We've found nice, full-body fossils of priapulids like Ottoia in the Burgess Shale.

我们在伯吉斯页岩中发现了像 Ottoia 这样的 priapulids 的漂亮全身化石。

Communities of priapulids and other similar organisms changed the seafloor from hard matgrounds to the softer sediment found in the Cambrian.

priapulids 和其他类似生物群落将海底从坚硬的地垫变为寒武纪较软的沉积物。

And some species of modern priapulid worms coat themselves in layers of mucus and bacteria, which helps to protect them from toxic environments.

一些现代 priapulid 蠕虫会在自己身上包裹一层粘液和细菌，这有助于保护它们免受有毒环境的侵害。

And it's only been in the last few years that scientists have figured out the probable culprit behind these trace fossils – priapulid worms.

直到最近几年，科学家们才找出这些遗迹化石背后可能的罪魁祸首——普里普利德蠕虫。