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

有的古生物家认为它们属于已经绝迹的一门动物。

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

牡蛎软体动物门下的软体无脊椎动物。

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

它们都被分类为钵水母纲的动物，和珊瑚一样同属刺丝胞动物门。

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

化枝不“种”或“门”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，新的门和新的纲不断产生。如今我们只有新的种！”

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

今天节目的最后为你带来的包括海星、海参及海胆在内的棘皮动物门。

" 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Port-au-Prince，瞧，" Papa doc的首都" ，所以太子港，海地的。

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

最小的鱼苗通常会喂食轮虫，轮虫17世纪晚期由早期显微镜家发现的一门微小动物。

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

海洋中软体动物种类远超其他动物门。

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

哪种“门”类首先登陆陆地呢？

There's domain, kingdom, phylum, class, order, family, genus, species... and me falling asleep in biology class.

有领域、界、门、纲、目、科、属、种… … 而我在生物课上睡着了。

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种，也许多达20种，不属于任何已经确认的门。

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——环节动物门虫子——可以重新生长，不同于我们在动物界见过的任何其它生物。

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

扁形虫门通常被称为鸭嘴兽门，因其简单性而在蠕虫中独树一帜。

The scientists compiled a massive database of body measurements from five phyla and 17,208 genera of marine animals.

科家们编制了一个庞大的数据库，其中包含五个门和 17,208 个海洋动物属的身体测量数据。

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

海参棘皮动物门的成员，还有海胆、海星和其他径向对称的“多刺”海洋无脊椎动物。

540 million years ago, for 50 million years, there was just this burst of creativity, making all of the phyla that exist now.

5.4亿年前，5000万年里，创造力的爆发，创造了现在存在的所有门类。

Tardigrades, or more adorably known as water bears and moss piglets, are a phylum of small invertebrates that are bilaterally symmetrical and have four pairs of legs.

缓步动物，或更可爱地被称为水熊和苔藓仔猪，一门小型无脊椎动物，它们左右对称，有四对腿。

Above the size of L rotifers, however, farmers switch phylum and feed their charges crustaceans called brine shrimps, the smallest of which clock in at 400 microns.

然而，L号轮虫再往上，农民们换了门，用一种被称为“盐水虾”的甲壳类动物喂食，最小的盐水虾长度有400微米。

Also known as water bears, tardigrades are a phylum of adorably tiny invertebrates with four pairs of legs, tube-shaped spiky mouths … and superpowers.

缓步动物也被称为水熊，一种可爱的小型无脊椎动物门， 有四对腿、管状尖嘴… … 以及超能力。