19. Hermaphrodite

A hermaphrodite is an organism who has both female and male reproductive organs. Commonly seen in invertebrates, these organisms do not have specific sexes allowing them to reproduce with any creature like itself.
I used a picture of Super Worms found at a pet store. Worms are hermaphrodites who connect at the clitella. Sperm is then exchanged, leaving both worms with an egg.