hermaphroditeis an organism that hasreproductive organsand producesgametesnormally associated with both male and femalesexes.Manytaxonomicgroups of animals (mostlyinvertibrates) do not have separate sexes.In these groups, hermaphroditism is a normal condition, enabling a form ofsexual reproductionin which either partner can act as the "female" or "male". For example, the great majority oftunicates,pulmonatesnails,andslugsare hermaphrodites. Hermaphroditism is also found in some fish species and to a lesser degree in othervertebrates. Most plants are also hermaphrodites.
Historically, the termhermaphroditehas also been used to describeambicous genitaliaand mosaicism inindividuals ofgonochoristic species, especially human beings. The wordintersexhas come into preferred usage for humans, since the wordhermaphroditeis considered to be misleading and stigmatizing,as well as "scientifically specious and clinically problematic".
A rough estimate of the number of hermaphroditic animal species is 65,000.Since the estimated total number of animal species is 8.6 million, the percentage of animal species that are hermaphroditic is about 0.7%. Arthropods are the withthe largest number of species. Most hermaphroditic species exhibit some degree of self-fertilization. The distribution of self-fertilization rates among animals is similar to that of plants, suggesting that similar processes are operating to direct the evolution of selfing in animals and plants. Earthworms are also one of the common example