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Comprehensive phylogenetic analysis of all species of swordtails and platies (Pisces: Genus Xiphophorus) uncovers a hybrid origin of a swordtail fish, Xiphophorus monticolus, and demonstrates that the sexually selected sword originated in the ancestral lineage of the genus, but was lost again secondarily

Ji Hyoun Kang, Manfred Schartl, Ronald B Walter and Axel Meyer*

BMC Evolutionary Biology 2013, 13:25  doi:10.1186/1471-2148-13-25

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1471-2148-13-25