脊椎动物 jǐzhuīdòngwù vertebrate Definitions Defs Origin Strokes Stroke Words Sentences Sents 无脊椎动物 wújǐzhuīdòngwù invertebrate 古脊椎动物学 gǔjǐzhuīdòngwùxué vertebrate paleontology the study of fossil vertebrates圆口纲脊椎动物 yuánkǒugāngjǐzhuīdòngwù cyclostome cyclostome (marine biology)脊椎动物门 jǐzhuīdòngwùmén Vertebrata Vertebrata, the phylum of vertebrates