Ahmad, Wasim, Ph.D. (1981), D.Sc. (1993) in Nematology (Zoology), Aligarh Muslim University, is Professor of Nematology (Zoology) at Aligarh Muslim University, India. He has wide experience of working in leading Nematology laboratories of the world, has published extensively on the taxonomy of soil inhabiting nematodes belonging to the orders Dorylaimida and Mononchida and is considered an authority on these groups.Jairajpuri, Mohammad Shamim, Ph.D. (1964), D.Sc. (1970) in Nematology (Zoology), Aligarh Muslim University, formerly Principal Nematologist CABI, UK; Director, Zoological survey of India is Emeritus Professor and INSA Senior Scientist at Aligarh Muslim University. He has wide experience of working in leading Nematology labs of Europe and is a world authority on the taxonomy of Mononchida and Dorylaimida.