If you are given a specimen, what are the steps that you would follow to classify it?
Classification of specimen deals according to a systematic plan on the basis of their v similarities, differences and relationship. We will take the following steps (i) Level or grade of organisation: There are different types of cell which are organised into functional units of progressively increasing complexity. Such as acellular, cellular, tissue, organ and organ system. (ii) Pattern in organ system : There are different organ system in which specific group of organs work together to do a specific function. Such as digestive organs in digestive system. Respiratory organs in respiratory system, etc. in animal body. (iii) Symmetry: In animals, 4-types of symmetry are seen. These are spherical, radial, bilateral, Asymmetrical species are classified according to symmetry. (iv) Diploblastic and triploblastic organisation: According to number of germ layers which differentiate at the time of gastrulation in developing embryo. Species are classified as diploblastic i.e. two germ layer and Triploblastic i.e. three germ layers. (v) Body cavity or coelom: According to types of coelom, species are classified into acoelom, pseudocoelom and eucoelom animals. (vi) Segmentation: Species are classified according to segmentation. It is of three types i.e. pseudometamerism or false segmentation, internal and external segmentation. (vii) Notochord: On the basis of notochord, animals or species are divided into chordates and non-chordates. We will follow the above steps in classification of animal, then fair idea of that animal can be derived.
