In this article we will discuss about the Structure of a Typical Fish. Fishes are cold blooded animals, typically with backbone, gills and fins. The body of a typical fish comprises the head, trunk and tail. The head bears two eyes, with well developed nictitating membrane, two internal ears, two nostrils which are closed internally (except in lung fishes) and [...]
The below mentioned article provides biology notes on Class Osteichthyes. 1. The endoskeleton is cartilaginous in the embryonic stage, but in the adult forms more or less it is replaced by bones. Thus they have bony endoskeleton. They are ectothermic (cold blooded). There are about 25,000 species of bony fishes. 2. Caudal fin usually homocercal symmetrical (Gr. homos- alike). 3. [...]
In this article we will discuss about the structure of silver fish (Lepisma) with the help of diagram. Fig. 146 SILVER FISH (LEPISMA) 1. It is a very common insect found among books, behind picture frames, among leaves& under stones etc. and is commonly called silver fish. 2. Body fattened, delicate and is covered over with delicate silvery scales. 3. [...]