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 [...]
In this article we will discuss about the structure of Ascaris with the help of a diagram. 1. It is a common endoparasite in the intestine of human beings. 2. Body worm-like and has pseudo-segmentation. 3. The females are larger and stouter than males and measure about 20-30 cm in length, whereas males reach to about 15-26 cm in length. [...]