In this article we will discuss about the structure of Terebella with the help of a diagram. 1. They are red coloured, marine and tubicolous worms found along European and American coasts buried in mud between sea rocks. 2. Body elongated and measures about 15 to 20 cm. in length and is broad in front and narrow behind. 3. Head [...]
In this article we will discuss about the structure of Dentallium with the help of a diagram. 1. It is commonly called "Tusk shell" and is a marine mollusc found buried in sand of deep seas. 2. Bilaterally symmetrical body is enclosed in a cylindrical curved, ridged and conical shell, which is open at both ends. 3. Foot is small [...]
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 [...]