The Phylum Cnidaria consists of sessile or free swimming animals, characterised by primary radial, often modified as biradial or quadriradial, symmetry and provided. Multicellular animals are often divided into vertebrates and invertebrates. The phylum chordata and subphylum vertebrata: their history. Mesenchyme, also known as mucous connective tissue or mucoid connective tissue, is a type of connective tissue found mostly during development of the embryo. The Vertebrata are sometimes considered as a subgroup of the clade Craniata, consisting of chordates with a skull the Craniata and Tunicata compose the clade Olfactores. Taxonomically, the phylum includes the subphyla Vertebrata, which includes fish, amphibians, reptiles, birds, and mammals Tunicata, which includes salps and sea squirts and Cephalochordata, comprising the lancelets. In the case of vertebrate chordates, the notochord is usually replaced by a vertebral column during development, and they may have body plans organized by segmentation. They are also bilaterally symmetriccoelomates. Chordates are deuterostomes, as during the embryo development stage the anus forms before the mouth. Chordata they possess a notochord, a hollow dorsal nerve cord, pharyngeal slits, an endostyle, and a post- anal tail, for at least some period of their life cycle. A chordate is an animal belonging to the phylum.
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