In this article we will discuss about the structure of Cattle Leech (Hirudo) with the help of a diagram. 1. Commonly called Indian Cattle leech and is a fresh-water form. 2. Ectoparasite on catties and even on man. 3. Setae, prostomlum, appendages and distinct head are absent. 4. Only a well developed posterior sucker is present. The anterior sucker being [...]
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 [...]