Abstract
A new technique, using garden snail's mucus, was employed for handling nematode eggs. Fertilization preceded the second maturation division. After fusion of the male and female pronuclei the zygote divided into two 1/2-blastomeres of unequal size. A coeloblastula was formed. Invagination of endoderm and stomodaeum occurred on the ventral side - the blastopore. Mesoderm and a single germ cell went in next. A notch on the ventral side divided the embryo into two lobes. Elongation of these with rearrangement and differentiation of cells formed the coiled first-stage larva. Four moults occurred after hatching. The duration of each larval stage varied, that of the third-stage being the shortest. Post-embryonic increments of body dimensions, changes in ratios a, b and c, and growth curves were determined. The embryonic and post-embryonic development was discussed.
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