Give the characteristic features of the following citing one example of each
a. Chondrichthyes and Osteichthyes
b. Urochordata and cephalochordate
Their habitat is mainly marine and their body is streamlined. They have a cartilaginous endoskeleton.
Examples are scoliosis and Trygon
The habitat is both marines as well as freshwater and they have a streamlined body. The endoskeleton is bony.
Examples are Marine: Hippocampus (Sea horse), Freshwater: Labeo (Rohu), Aquarium: Betta (Fighting fish)
(b) Urochordata and cephalochordate
In urochordates, the notochord is present only in the larval tail but in cephalochordates, notochord extends from head to tail region and is persistent throughout the life.
• Examples – Urochordates: Ascidia, Salpa, Cephalochordates: Branchiostoma.