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 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. [...]
In this article we will discuss about the structure of Balanus with the help of a diagram. Fig. 237 BALANUS 1. It is commonly known as “rock barnacle” or “acorn barnacle” and is sessile and blind and found in sea attached to rocks or stones. 2. Body is surrounded by a hard calcareous shell comprising of two pairs of carino-lateral [...]