Hermaphrodite

Definition

An organism that possesses both male and female reproductive organs and produces both male and female gametes. In hermaphroditic species, any two mature individuals can mate and produce viable offspring, as each functions as both sperm donor and egg producer. This reproductive strategy contrasts with gonochorism (separate sexes) and differs from parthenogenesis, which requires no mating. Hermaphroditism is common in mollusks, many annelids, and some arthropods, but rare in insects.

Etymology

From Greek Hermaphroditos, the mythological son of Hermes and Aphrodite who merged with the nymph Salmacis.

Example

The Giant African Land Snail (Achatina fulica) is a hermaphrodite; when two individuals encounter, each can inseminate the other, with both typically laying eggs afterward. Some scale insects (Coccoidea) exhibit hermaphroditism in which individuals possess both testes and ovaries.

Synonyms

• monoecious (in botanical/older zoological usage)

Related Terms

• gonochoric
• Parthenogenesis
• sequential hermaphroditism
• simultaneous hermaphroditism
• protandry
• protogyny
• Sexual dimorphism

Usage Notes

In modern zoological usage, 'hermaphrodite' refers to animals with both male and female reproductive tissue; 'monoecious' is reserved for plants with separate male and female flowers on the same individual. Distinguish from intersex conditions (atypical development within normally gonochoric species). Some specialists prefer 'simultaneous hermaphrodite' when both systems are functional at once, versus 'sequential hermaphrodite' for species that change sex during life (protandry: male first; protogyny: female first). True hermaphroditism is extremely rare in insects, which are almost exclusively gonochoric.