In this article we will discuss about the structure of Balanus with the help of a diagram. Fig. 237 BALANUS 1. It is commonly known as “rock barnacle” or “acorn barnacle” and is sessile and blind and found in sea attached to rocks or stones. 2. Body is surrounded by a hard calcareous shell comprising of two pairs of carino-lateral [...]
In this article we will discuss about the structure of Dero with the help of a diagram.1. They are small, transparent and freshwater oligochaetes of reddish colour living in tubes. 2. Head not distinct but proboscis is elongated and prominent. 3. They have distinct metameric segmentation visible externally and the segments 45-48. 4. The setae are present only ventral sides [...]
In this article we will discuss about the structure of Tubifex with the help of a diagram. 1. Fresh water, tubicolous and red coloured obligochaetes found at the muddy bottom of ponds and ditches of U.S.A. 2. Body bilaterally symmetrical, triploblastic and metamerically segmented. 3. Distinct head and appendages are absent and all the segments are alike. 4. Clitellum is [...]