01:146:328 Lecture Notes - Lecture 16: Secernentea, Nematode, Cell Membrane
1 Dec 2016
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Reproduction, nematodes are dioecious (separate female and male individuals) i. Nematodes are also dimorphic (the sexes look different from each other: females are larger than the males, males i. ii. Sperm: do not have flagella, pseudopodia locomotion, bursa is found in some species and is located at posterior end of the worm, male uses this to hold the female during mating, female i. ii. Eggshell formation in most species, the egg has 3 layers: this formation is initiated when the sperm penetrates the oocyte, a new plasma membrane is formed beneath the original oocyte membrane. The original membrane develops into vitelline layer (the outermost layer of the egg shell: chitnous layer (made of chitin) forms beneath the vitelline layer, there are refringement bodies that are from the sperm. In oocyte, the refringent bodies migrate to the periphery. They then fuse together and expel their content forming the lipid layer (the inner most layer of the egg shell) v.
