In this article we will discuss about the structure of Arenicola with the help of a diagram. 1. It is a brownish green burrowing and tubiciolous marine polychaete. 2. Commonly called ‘lug worm’ and is found in muddy regions along Mediterranean and turopean shores. 3. It forms "U" shaped burrows which are lined internally with mucous. 4. Body cylindrical, vermiform, [...]
In this article we will discuss about the structure of Chaetopterus with the help of a diagram. 1. They are marine, tubicolous and burrowing worms. 2. The tubes are "U" shaped and are lined with thick mucous secreted by the animal. 3. Body is about 20—30 cm in length and is divisible into an anterior, a middle and a posterior [...]
In this article we will discuss about Annelida:- 1. History of Annelida 2. General Characters of Annelida 3. Classification 4. Metamerism 5. Coelom 6. Segmental Organs 7. Reproduction. Contents: History of Annelida General Characters of Annelida Classification of Annelida Metamerism in Annelida Coelom in Annelida Segmental Organs of Annelida Reproduction in Annelida 1. History of Annelida: The annelids were by [...]