name the phylum which is characterized by the presence of notochord
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Answer:
protochordata....................
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Answer:
Phylum Chordata is characterized by the presence of notochord.
Explanation:
Notochord - It is an elongated structure shaped like a rod, which extends to the entire length of the body.
- It is situated beneath the nerve cord and just above the digestive canal.
- It emerges from the endodermal roof present in embryonic archenteron.
- It is made up of notochordal cells which large and vacuolated. These cells are surrounded by outer fibrous and inner elastic sheath and also contain gelatinous matrix
- It is the main diagnostic feature of the phylum Chordata
- It is very critical for proper vertebrate development as it serves as an internal skeleton.
- Typically it is seen in Protochordata. In higher vertebrates, it is replaced by the vertebral column.
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