Mostly linking this for my own reference, but Wolbachia really is a ridiculously cool symbiont with all kinds of terribly cool effects in arthropods. A lot of them are related to sex-ratio distortion, like male-killing or inducing parthenogenesis or feminizing males in development so that they reproduce like females. This is because Wolbachia is transmitted to offspring through the cytoplasm in the egg of the insect, so it has no “interest” in diverting resources to the creation of males and often evolves methods intended to direct the entirety of a given insect’s reproductive investment to female offspring. This maximizes its transmission. 

If you want to know more, the link is a really nice general overview! This is my very favorite symbiont, and I totally encourage people who are interested to glance over that piece.