In this article we will discuss about the respiratory system of Channa Punctatus with suitable diagram. Respiration is performed by four pairs of gills, situated in the gill chambers, and accessory respiratory organs. These two chambers are covered externally by the operculum. A branchiostegal membrane is attached to the posterior margin of the operculum and helps the operculum to make [...]
In this article we will discuss about the external structure of toad. This will also help you to draw the structure and diagram of toad. Toad has a short bilaterally symmetrical body (Fig. 1.61). There is no exoskeleton over the skin, i.e., the skin is naked skin is rough in texture. The dorsal side of the body is blackish-gray while [...]
The following points highlight the top nine diagnostic features of chordates. 1. Notochord is present in any stage of the life-history. It is a slender rod that arises out of the dorsal wall of the embryonic gut in primitive chordates. Notochord lies dorsal to the coelom and parallel beneath the central nervous system. The notochord is composed of a core [...]