Some palaeontologists think them members of a phylum that is now extinct.

有古物学家认为它们属于已经绝迹一动物。

Oysters are soft-bodied invertebrates belonging to the phylum mollusca.

牡蛎是软体动物下软体无脊椎动物。

They belong to the class Scyphozoa, in the phylum Cnidaria, which also includes corals.

它们都是被分类为钵水母纲动物，珊瑚一样同属刺丝胞动物。

Now, clades aren't a rank, like species or phylum.

进化枝不是“”或“”这些级别。

Back in the Cambrian, new phyla and new classes arose. Nowadays we only get new species!

而在寒武纪，纲不断产。如今我们只有！”

Our last story today involves the phylum Echinodermata, which includes starfish, sea cucumbers and sea urchins.

今天节目最后为你带来是包括海星、海参及海胆在内棘皮动物。

" phylum" which makes 14 across " port-au-prince" see, " papa doc's capitol idea, " that's " port-au-prince." Haiti.

Phylum这样一来横14就是Port-au-Prince，瞧，提示是" Papa doc首都" ，所以是太子港，海地。

So, which of these land-dwelling phyla first invaded the land?

哪“”类首先登陆陆地呢？

There are more species of molluscs in the ocean than any other animal phylum.

海洋中软体动物类远超其他动物。

For the smallest fry these are often rotifers, a phylum of tiny animals discovered in the late 17th century by early microscopists.

最小鱼苗通常会喂食轮虫，轮虫是17世纪晚期由早期显微镜学家发现一微小动物。

These organisms are members of the phylum Bryozoa, a name that translates in Greek to moss animals.

这些物属于苔藓动物，这个名字在希腊语中意思是“苔藓动物”。

Altogether, according to Gould, at least fifteen and perhaps as many as twenty of the Burgess animals belonged to no recognized phylum.

据古尔德说，在布尔吉斯动物群当中，总共至少有15，也许多达20，不属于任何已经确认。

But there's this one phylum of worms, the annelids, that can re-grow unlike anything else that we've ever seen in the kingdom.

但有一类虫子——环节动物虫子——可以重长，不同于我们在动物界见过任何其它物。

The flatworm phylum is generally  known as the Platyhelminthes, which are distinctive among  the worms for their simplicity.

扁形动物通常被称为扁虫，它们在蠕虫中以其简单性而独具特色。

And in the cnidaria phylum, both corals and hydra  have been observed with their own sorts of tumors.

在刺胞动物中，珊瑚水螅都观察到有它们自己肿瘤。

Then there is the phylum Nematoda, known less formally as roundworms.

然后是线虫，非正式地称为圆线虫。

And last are the Annelida, phylum of our playground friend, the earthworm.

最后是环节动物，我们小伙伴——蚯蚓就属于这个。

Of the three phyla we've mentioned, annelids are the most complex.

在我们提到三个中，环节动物是最复杂。

Sea cucumbers are members of the phylum Echinodermata, along with sea urchins, starfish and other radially symmetrical, " spiny-skinned" marine invertebrates.

海参是棘皮动物成员，还有海胆、海星其他径向对称“多刺”海洋无脊椎动物。

Snails are members of the Mollusca phylum, which includes oysters, clams, octopuses, and squids.

蜗牛属于软体动物，该还包括牡蛎、蛤蜊、章鱼鱿鱼。