Early embryonic developmental patterns in soil nematodes

Abstract

The eggs of soil nematodes arc usually laid in single cell stage but in some cases retained upto three cleavages and still in some, the entire embryonic development takes place within the famale's body. Polarity in eggs, is determined by the position of polar body. The first cleavage furrow is transverse but the cleavages afterwards are variable in different nematode groups. The division can be equal or unequal or it can be transverse, longitudinal or oblique in plane. The time taken between two consecutive cleavages vary from species to species and il is greater in tylenchids among Secernenteans and in Adenophoreans.