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 the structure of Sacculina with the help of a diagram. 1. This is a specimen of sacculina—"the sucking root barnacle" an ectoparasite on crab. 2. It is in the form of a flat, fleshy and sac-like structure having only the gonad. It is found attached to the ventral surface of crabs between thorax [...]
In this article we will discuss about the structure of crabs with the help of suitable diagrams. 1. These are commonly known as "crabs" and are found buried under rocks, wood pieces and in sand along sea shore. 2. Body is flat and covered by a carapace. It is comprised of a cephalothorax of 13 segments and abdomen is curved [...]