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D. melanogaster
Drosophila melanogaster (D. melanogaster), which is commonly known as the fruit fly, is a deoecious organism of invertebrates. In female D. melanogaster, there are 2 ovaries and each of that is made of 16 ovarioles (Fig 2). The movement of the development from oogonial stem cells to mature oocyte is presented in a linear pattern which is similar to that of C. elegans. In D. melanogaster, the 14-stage development of oocyte starts from the anterior of the ovariole to the posterior. The mature oocytes then temporarily stored in the uterus after passing through the oviduct to wait for the egg deposition.