In this article we will discuss about the structure of Bonellia with the help of a diagram. 1. It is a small marine and burrowing worm found living in "V" shaped holes in mud or sand or in crevices between rocks along seashores. 2. It exhibits sexual dimorphism. 3. The female possesses an ovoid green body of about 5 cm., [...]
In this article we will discuss about the structure of Polystomum with the help of a diagram. 1. They are endoparasites in the urinary bladder of frogs, toads and turtles. 2. The body is dorsoventrally flattened and leaf-like. 3. They are acoelomate, triploblastic un-segmented and monogenetic trematodes. 4. Anterior end without or with a weak sucker J. Posterior end has [...]
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 [...]