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Nematodes and Namatology the name nematode was derived from Greek words nema means thread iodes means resembling . Father of nematology is  N.A. Cobb (1915), American nematology.  Nematology is an important branch of biological science which deal with a complex diverse group of roundworms known as nematodes . It is also known as roundworms . Nematodes are circular in cross section . They are free living ,aquatic and terrestrial or parasitic in plant and animals. They are bilaterally symmetrical, triploblastic and pseudocoelomate animals. Sex organ are separate is called Dioecious that is male and female are distinct. Female nematodes are longer than males. Nematodes are unsegmented , Vermiform and colour less animals. plant parasitic nematodes are slender, elongate, spindle shaped ,or fusiform, tapering towards both ends    and circular in cross section. The length of nematode may vary from 0.2 mm. Their body width vary from 0.01 to 0.05 mm. Fertilization is...