In this article we will discuss about the characters and classification of urochordata. Characters of Urochordata: These animals are known as 'sea squirt'. The life-history of urochordates passes through a dramatic change. Their chordate characters are more pronounced during larval period. While in adults they are more like invertebrates than chordates. Therefore, the characters are described in two heads — [...]
In this article we will discuss about the external structures of calotes. This will also help you to draw the structure and diagram of calotes. The body of Calotes is divisible into three regions: head, trunk and tail (Fig. 1.85). A small narrow neck joins the head with the trunk. The head is more or less triangular in appearance. The [...]
In this article we will discuss about the circulatory system of calotes. Transportation of various substances within an organism is conducted by the circulatory system. The circulatory system consists of cardiovascular system and lymphatic system. The cardiovascular system includes: (a) The heart, (b) The blood, (c) Arteries and (d) Veins. (a) Structure of Heart: The heart of Calotes lies in [...]