Thesis

A study of the embryology of Nematospiroides dubius

The embryology of nematodes has been investigated by a number of zoologists and has been the subject of several classical studies in cytology and germ-cell lineage. The principal embryological studies are those of Boveri (1567, 1866,1890,1909), Zur Strassen (1696,1698), and Muller (1903) on Parascaris equorum (=Ascaris megalocephala), Martini (1903) on Cucullanus elegans, Goodrich (1916) on Ascaris incurva, Walton (1918) on Ascaris canis, Pai (1928) on Anguillula aceti, Nigon and Brun (1955 ) on Caenorhabditis elegans, and Mulvey (1955) on several free-living and plant parasitic nematodes. The most exhaustive studies of the embryology of the nematode egg were made by Boveri, Zur Strassen, and Muller on Parascaris equorum (=Ascaris megalocephala). Boveri (1887, 1888, 1890) studied in detail the processes of oogenesis and fertilization in the Ascaris egg. Zur Strassen (1696,1898) observed the development of the fertilized egg up to the 200-cell stage. Muller (1903) endeavored to carry on the analysis of the development up till the time when the young worm has hatched. In this project, the embryology of Nematospiroides dubius (a parasitic nematode of mice) is studied. Emphasis is placed on oogenesis, fertilization, cleavage and gastrulation. 'The morphological aspects of these stages are investigated.

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