In this article we will discuss about the structure of Earthworm (Pheretima) with the help of a diagram. 1. It is commonly known as earthworm and is terrestrial and burrowing in habit. 2. Body bilaterally symmetrical, triploblastic and metamerically segmented. 3. No distinct head or appendage but a distinct prostomium is present. 4. Clitellumis present in segments 14-16. 5. Single [...]
In this article we will discuss about the structure of Dero with the help of a diagram.1. They are small, transparent and freshwater oligochaetes of reddish colour living in tubes. 2. Head not distinct but proboscis is elongated and prominent. 3. They have distinct metameric segmentation visible externally and the segments 45-48. 4. The setae are present only ventral sides [...]
In this article we will discuss about the structure of Tubifex with the help of a diagram. 1. Fresh water, tubicolous and red coloured obligochaetes found at the muddy bottom of ponds and ditches of U.S.A. 2. Body bilaterally symmetrical, triploblastic and metamerically segmented. 3. Distinct head and appendages are absent and all the segments are alike. 4. Clitellum is [...]