Agnathans (Cyclostomes)
Modified and degenerate offshoot of primitive vertebrate stalk, that arose in Devonian.In the adult stage, they are parasites or scavengers on fish. Secrete anti-coagulants in saliva to facilitate feeding on…
Pisces (Superclass)
These are true, jawed vertebrates with specific organs for respiration, excretion and blood circulation. The organisms belonging to this class are poikilotherms, meaning that they cannot regulate their own body…