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

有的古生物学家认为它们属于已绝迹的一门动物。

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。

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。

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.

进化枝不“种”或“门”这些级别。

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。

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.

但有一类子——环节动物门子——可以重新生长，不同于我们在动物界见过的任何其它生物。

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，轮17纪晚期由早期显微镜学家发现的一门微小动物。

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

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！”

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，不属于任何已确认的门。

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

也被称为水熊，缓步动物门一类可爱的小型无脊椎动物， 拥有四对腿、管状刺嘴… … 以及超能力。

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

5.4亿前，5000万里，创造力的爆发，创造了现在存在的所有门类。

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。

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。

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

扁形动物门通常被称为扁，它们在蠕中以其简单性而独具特色。

Ethan is in that phylum of actors who probably has the quickness, you know, because it's hard.

伊桑属于那种演员群体，他大概具备敏捷的反应能力，你知道的，这很难。

Worms from the phylum Nematoda or the phylum  Annelida have some sort of body cavity— a fluid-filled space between the body  wall and the digestive tract that helps transport nutrients and corresponds to  the development of more complex systems.

来自线动物门或环节动物门的蠕具有一种体腔——位于身体壁和消化道之间充满液体的空间，有助于运输营养物质，并对应着更复杂系统的发展。

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

哪种“门”类首先登陆陆地呢？

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

科学家们编纂了一个庞大的数据库，包含了五个门和17208个海洋动物属的身体测量数据。