There is an interesting example of Wolbachia in Drosophila paulistorum, where it acts as an obligate mutualist. If you take out Wolbachia, D.pau develops dystrophic ovaries, means the ovarioles don't mature. So, the ovaries are there, but with small size and abnormal shape, having degenerated nurse cell nuclei.
Here is the article link: http://journals.plos.org/plospathogens/article?id=10.1371/journal.ppat.1001214#ppat-1001214-g004