Describe characteristics features of different prochordates ?
Answers
Explanation:
Bilateral symmetry means the body can be divided into two equal similar halves by a single plane.
* They are triploblastic animals as three layers are present in them namely ectoderm, mesoderm and endoderm.
They are mostly marine animals.
True coelom is present in them.
* Notochord is present in them.
They don't have vertebral column.
They don't have proper notochord at all stages of their life.
* Ventral heart is present in them.
Post and tail is also present in them.
* Ex :- Balanoglossus.
They are divided into two groups namely :
1. Urochordata :
They are marine, mostly sessile, filter feeding animals.
Ex :- Tadpole.
2. Cephalochordata :
They are also marine, filter feeding in vertebrates.
Ex :- Lancelet.
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Prochordates are the forerunners of Vertebrates. They do not have a cranium or skull. So they are called Acrania. The classification is based on the nature of the notochord. The following are the three subphyla of prochordata.
(a) Hemichordates
(b) Cephalochordates
(c) Urochordates