We belong to a class of organisms called deuterostomes.

属于后口动物。

We’re all what biologists call deuterostomes, a classification that has to do with how we develop as embryos.

都是生物学家所说后口动物，这种分类与为胚胎发育方式有关。

In fact, the earliest deuterostomes might share common traits like openings that they used to help with filter feeding.

事实上，最早氘口可能具有共同特征， 例如它用来帮助滤食开口。

Fruit flies and humans are on opposite sides of a 670m-year-old division splitting bilaterally symmetrical animals into two groups: protostomes and deuterostomes.

果蝇和人类位于 670 历史分区对立面，将双侧对称动物分为两组：原口和后口。

The most widely-used definition of deuterostome has to do with how our mouths and — the SciShow comments’ favorite term — anuses develop.

最广泛使用后口动物定义与嘴巴和——SciShow 评论最喜欢术语——肛门发育方式有关。

This separation almost certainly predates the evolution of brains, meaning the brains of insects (which are protostomes) and those of vertebrates (deuterostomes) have separate origins.

这种分离几乎肯定早于大脑进化，这意味着昆虫（原口动物）大脑和脊椎动物（后口动物）大脑有不同起源。

So, these scientists think S. coronarius could be one of the earliest deuterostomes, based on comparisons of more than 60 features to other living creatures and fossils.

因此，这些科学家认为 S. coronarius 可能是最早后口动物之，基于与其他生物和化石 60 多种特征比较。