Chromadorea: The Chromadorea round worms were first considered a subclass of paraphyletic worms but that idea was denied and they were considered their own class. The Chromadorea resemble most nematodes except for their elaborate and sometimes spiraled aphids. Their pharynxes are also more sophisticated than most worms. Like the other nematodes though. It reproduces the same. The Chromadorea worms can have a pair of both male and female testes or they may have to find a mate if they want to reproduce. Once they find a mate and reproduce, their offspring will be born which mainly resembles them. The only difference between a young Chomadorea and an adult is the size and the development of the sexual organs.