There are also species where hermaphrodites exist alongside males (called androdioecy) or alongside females (called gynodioecy), or all three exist in the same species (called trioecy) these three systems are sometimes called mixed breeding systems. Animal species having different sexes, male and female, are called gonochoric, which is the opposite of hermaphrodite. Hermaphroditism is also found in some fish species and to a lesser degree in other vertebrates. For example, the great majority of tunicates, pulmonate molluscs, opisthobranch, earthworms, and slugs are hermaphrodites. In these groups, hermaphroditism is a normal condition, enabling a form of sexual reproduction in which either partner can act as the female or male. Many taxonomic groups of animals (mostly invertebrates) do not have separate sexes. In reproductive biology, a hermaphrodite ( / h ər ˈ m æ f r ə ˌ d aɪ t/) is an organism that has both kinds of reproductive organs and can produce both gametes associated with male and female sexes.
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