The first suborder to appear was Stylonuria.

第一出目是柱尿症。

But, during the Late Ordovician, a second suborder of sea scorpion emerges in the fossil record — the Eurytperina.

但是，在晚奥陶世期间，化石记录中出了海蝎第目——Eurytperina。

Sea scorpions would soon come to be defined by how they these appendages adapted, splitting off into two distinct suborders with two very different evolutionary strategies.

海蝎子很快就会根据这些附肢如何适应来定义，分为两不同目， 具有两种不同进化策略。

This led to much greater diversity in this suborder, which is probably why 75% of all known sea scorpion species -- and more than 95% of all the specimens ever found -- belong to Eurypterina.

这导致该目更加多样化，这可能就是为什么 75% 已知海蝎物种——以及超过 95% 已发标本——都属于广翅目。