androdioecy
possessing a single gonad that produces both eggs and sperm. Eggs are fertilised internally and most offspring are clones. Found only in the mangrove killifish (Kryptolebias marmoratus) in vertebrates. Some males exist, the numbers varying between populations, allowing greater genetic diversity, while androdioecy allows the fish to colonise new habitats

Dictionary of ichthyology. 2009.

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