In this article we will discuss about the structure of Apple Snail (Pila) with the help of a diagram. 1. It is commonly called "apple snail" and is found in fresh water ponds, pools and ditches in India and adjacent regions. 2. Shell is external and spirally coiled and is comprised of 6 whorls. 3. The axis around which coiling [...]
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 [...]