Abstract
The female reproductive system of Schizaphis graminum (Rondani) consists of 2 ovaries (each composed of 5 telotrophic ovarioles), lateral oviducts, median oviduct, and genital chamber. The ovaries and lateral oviducts are derived from 3 mesodermal tissues: anterior ovarian strands, primary epithelial sheaths, and posterior ovarian strands. The genital chamber arises as a ventral invagination between the 7th and 8th abdominal segments during early postparturition. The median oviduct arises from ectodermal ampullae within the 7th abdominal segment. The genital chamber joins with the central mass of the median oviduct, and these eventually develop confluent lumina. Reproductive system development begins in embryos within postparturienic nymphs, and all organ development is complete by 50 hours postparturition.
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