环孔

The sea anemones belong to the phylum Cnidaria and class Anthozoa, whereas the sea cucumbers are part of the phylum Echinodermata and class Holothuroidea.
海葵属于水螅纲和珊瑚亚门，而海参则属于棘皮动物门和海参亚纲。
The Ctenophora, or comb jellies, are another group within the phylum Cnidaria.
栉水母，或称梳状水母，是水螅纲内的另一个群体。
The Turbellaria are flatworms that are often found in freshwater environments.
涡虫门的扁虫通常在淡水环境中被发现。
The phylum Platyhelminthes includes flatworms like the tapeworms and flukes.
扁形动物门包括像绦虫和吸虫这样的扁虫。
The Loricifera are a small, often overlooked group of marine animals.
螺壳动物是一群小型、经常被忽视的海洋动物。
The Lophotrochozoa is a large clade that includes annelids, molluscs, and many more.
轮辐后生动物是一大类群，包括环节动物、软体动物等。
The Rotifera, or rotifers, are tiny aquatic animals known for their ability to enter a state of suspended animation.
轮虫是小型水生动物，因其能够进入休眠状态而闻名。
The Nemertea, or ribbon worms, are long, slender animals that can be found in both marine and freshwater environments.
无颌腹足动物，或称为带状蠕虫，是既能在海洋也能在淡水中找到的细长动物。
The phylum Annelida includes segmented worms such as earthworms and leeches.
环节动物门包括如蚯蚓和吸血虫这样的分节蠕虫。
The Phoronida are a small group of marine animals that have a unique life cycle.
福龙纲是一群独特的海洋动物，它们有一个独特的生活周期。