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教材分析教材前八章讲述了原生动物、腔肠动物、扁形动物、线形动物、环节动物、软体动物、节肢动物和棘皮动物,共八门。它们的共同特点是体内没有脊椎骨组成的脊柱。这些门类的动物,统称为无脊椎动物。鱼类体内都有一条由很多脊椎骨连接成的脊柱。象鱼类一样,体内有一串脊椎骨的动物统称为脊椎动物。脊椎动物是脊索动物门中的一个亚门,这个亚门又分为鱼纲、两栖纲、爬行纲、鸟纲和哺乳纲。
The first eight chapters of textbook analysis materials tell about eight kinds of protozoa, coelenterate, flat animals, linear animals, annelids, molluscs, arthropods and echinodermata. Their common feature is the spine that has no vertebrae in the body. These categories of animals, collectively referred to as invertebrates. The body of fish has a spine connected by many vertebrae. Like fish, animals with a bunch of vertebrae in the body are collectively referred to as vertebrates. Vertebrate is a subclass of phylum of the chordate, which is divided into fish, amphibia, reptilia, avian and mammalian.