Intersex people were previously referred to as hermaphrodites or "congenital eunuchs". Earthworms are hermaphrodites&colon; each carries male and female sex organs. At times they incorrectly implied that these individuals were intersex (or, "hermaphrodites"). Each plant is dioecious, with hermaphrodites being extremely rare. Almost all ascidians are hermaphrodites and conspicuous mature ascidians are sessile. The females depend upon pollen from hermaphrodites for pollination. The animals are simultaneous hermaphrodites, and fertilization occurs internally. Grouper are protogynous hermaphrodites, who school in "harems" of three to fifteen females. These species are known as sequential hermaphrodites. Jellyfish are usually either male or female (with occasional hermaphrodites). The flowers are female, male or hermaphrodites. Most forms reproduce sexually and with few exceptions all are simultaneous hermaphrodites. Zooids of all phylactolaemate species are simultaneous hermaphrodites. Because of this, they are considered to be protogynous hermaphrodites which have planktonic larvae. As an example, most wrasses are protogynous hermaphrodites within a haremic mating system.