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Published on: July 11, 2025
Population genetics and evolution of the mangrove rivulus Kryptolebias marmoratus, the world's only self-fertilizing
1Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697, U.S.A.
Abstract:
The mangrove rivulus, Kryptolebias marmoratus (Rivulidae, Cyprinodontiformes), is phylogenetically embedded within a large clade of oviparous (egg laying) and otherwise mostly gonochoristic (separate sex) killifish species in the circumtropical suborder Aplocheiloidei. It is unique in its reproductive mode: K. marmoratus is essentially the world's only vertebrate species known to engage routinely in self-fertilization as part of a mixed-mating strategy of selfing plus occasional outcrossing with gonochoristic males. This unique form of procreation has profound population-genetic and evolutionary-genetic consequences that are the subject of this review.
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