In this article we will discuss about:- 1. Origin of Cyclostomes 2. General Characters of Cyclostomes 3. Classification 4. Representative Types 5. Affinities. Origin of Cyclostomes: The Cyclostomata (Gr., cyklos = circular + stoma = mouth) are the living agnathans, they are primitive in many respects, but specialised in others. They are a modified and degenerate offshoot of the primitive [...]
In this article we will discuss about the external features of lamprey with the help of suitable diagrams. Also learn about its habit and habitat. Shape and Size: The body of adult Petromyzon is elongated, cylindrical and eel-like. Petromyzon marinus (sea-lamprey) attains a length of a metre, Lampetra fluviatilis (Lampern or common freshwater lamprey) reaches a length of about 90 [...]
Here is an essay on ‘Snakes’ for class 11 and 12. Find paragraphs, long and short essays on ‘Snakes’ especially written for school and college students. Essay on Snakes Essay Contents: Essay on the Habitat of Snakes Essay on the External Features of Snakes Essay on the Feeding Mechanism of Snakes Essay on the Poison Apparatus in Snakes Essay on [...]