In this article we will discuss about the structure of Planaria (Dugesia) with the help of a diagram. 1. Commonly called planaria and is a fresh water form of cosmopolitan distribution. 2. The body is elongated, flattened and some-what conical. 3. A distinct head is present, which is triangular in form and bears a pair of semicircular ocelli and a [...]
In this article we will discuss about the structure of Cestum with the help of a diagram. 1. It is a marine, solitary and bioluminescent ctenophore commonly called 'Venus girdle' and is found in the tropical sea. 2. Body is elongated, ribbon-like is compressed laterally. The colour is green, violet or blue. 3. Comb plates for swimming are eight, four [...]
In this article we will discuss about the structure of Coeloplana with the help of a diagram. 1. It is found in Red Sea along the coasts of Japan and Indo-China and is a marine solitary animal. 2. Body is oval and dorso-ventrally flattened. 3. It is an ectocommensal on Alcyonarians. 4. Swimming plates are absent. 5. On the aboral [...]