Gonochorism
State of having just one sex in any individual organism / From Wikipedia, the free encyclopedia
Not to be confused with sexual dimorphism.
In biology, gonochorism is a sexual system where there are two sexes and each individual organism is either male or female.[1] The term gonochorism is usually applied in animal species, the vast majority of which are gonochoric.[2]: 212–222
Gonochorism contrasts with simultaneous hermaphroditism but it may be hard to tell if a species is gonochoric or sequentially hermaphroditic e.g. parrotfish, Patella ferruginea.[3] However, in gonochoric species individuals remain either male or female throughout their lives.[4] Species that reproduce by thelytokous parthenogenesis and do not have males can still be classified as gonochoric.[5][clarification needed]