Chordata Species
This phylum is considered as the third largest phylum in the animal kingdom.
Chordata species. Members of the subphylum cephalochordata have large notochords and primitive brains and their circulatory systems have neither heart nor blood cells. All the chordates possess a supporting skeletal rod or notochord a hollow dorsal nerve cord and paired gill slits at some stage of their life history which may persist change or disappear in adults. Updated february 20 2019. Of these the vertebrates lampreys mammals birds amphibians reptiles and fishes are the most familiar and are the group to which humans belong.
Phylum chordata can be divided into two groups. Chordata sind ein stamm des tierreichs zu den chordatieren gehören der unterstamm der schädel craniota oder wirbeltiere vertebrata und damit auch die säugetiere mammalia einschließlich des menschen sowie zwei weniger bekannte ausschließlich im meer lebende unterstämme die schädellosen cephalochordata oder acrania und die manteltiere tunicata. The phylum chordata is a very diverse phylum which contains about 43 000 living species. A chordate ˈ k ɔːr d eɪ t is an animal of the phylum chordata during some period of their life cycle chordates possess a notochord a dorsal nerve cord pharyngeal slits and a post anal tail.
Among them most organisms belong to the subphylum vertebrata. There are about 3 000 species of tunicates. These four anatomical features define this phylum chordates are also bilaterally symmetric and have a coelom metameric segmentation and circulatory system.