The animals which have either vertebrates or have various closely connected invertebrates comes under phylum chordata and are known as chordates. The chordata mainly comprises of:
· Craniata which consists of vertebrate
· Cephalochordata which embodies lancelets
· Urochordata which embodies tunicates
The chordates belong to the:
Kingdom – Animalia
Superphylum – Deuterostomia
Phylum - Chordata
The chordates are monophyletic which refers that the phylum chordata includes only those species which are descendants of the ancestor that is itself a chordate. The chordate has one or more of the following:
(i) It is a notochord which is a rod like structure of cartilage.
(ii) The communication link of the nervous system is the dorsal neutral tube.
(iii) The chordates also have slits which are used to extract food from the water.
(iv) The chordates also have a tail which moves behind the anus.
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