Yellow swordtail

Yellow swordtail
Conservation status
	; Data Deficient (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Cyprinodontiformes
Family:	Poeciliidae
Genus:	Xiphophorus
Species:	X. clemenciae
Binomial name
	Xiphophorus clemenciae; Álvarez, 1959

The yellow swordtail (Xiphophorus clemenciae) is a species of freshwater fish in the family Poeciliidae.[2] It is endemic to the upper Coatzacoalcos River basin in southern Mexico.[3] It is typically found in brooks and streams with slow current; it is less frequent in areas with strong current.[2] The yellow swordtail is considered a threatened species by Mexican authorities.[4] It reaches up to 5.1 cm (2.0 in) in standard length.[2]

Unusually, the yellow swordtail appears to be the result of hybrid speciation, and its ancestors a platy species and a swordtail species.[3][5] The southern mountain swordtail (X. monticolus), which is found further south in the Coatzacoalcos River basin than the yellow swordtail, is the result of a similar event.[3]

Sources

Vega-Cendejas, M. (2019). "Xiphophorus clemenciae". IUCN Red List of Threatened Species. 2019: e.T23155A2784809. doi:10.2305/IUCN.UK.2019-2.RLTS.T23155A2784809.en.
Froese, Rainer and Pauly, Daniel, eds. (2018). "Xiphophorus clemenciae" in FishBase. September 2018 version.
Kang, J.H.; M. Schartl; R.B. Walter; A. Meyer (2013). "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". BMC Evolutionary Biology. 13 (25): 25. doi:10.1186/1471-2148-13-25. PMC 3585855. PMID 23360326.
Ceballos, G.; E.D. Pardo; L.M Estévez; H.E. Pérez, eds. (2016). Los peces dulceacuícolas de México en peligro de extinción. p. 279. ISBN 978-607-16-4087-1.
Meyer, A.; W. Salzburger; M. Schartl (2006). "Hybrid origin of a swordtail species (Teleostei: Xiphophorus clemenciae) driven by sexual selection". Molecular Ecology. 15 (3): 721–730. doi:10.1111/j.1365-294X.2006.02810.x. PMID 16499697.

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[1] Vega-Cendejas, M. (2019). "Xiphophorus clemenciae". IUCN Red List of Threatened Species. 2019: e.T23155A2784809. doi:10.2305/IUCN.UK.2019-2.RLTS.T23155A2784809.en.

[FishBase-2] Froese, Rainer and Pauly, Daniel, eds. (2018). "Xiphophorus clemenciae" in FishBase. September 2018 version.

[Kang2013-3] Kang, J.H.; M. Schartl; R.B. Walter; A. Meyer (2013). "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". BMC Evolutionary Biology. 13 (25): 25. doi:10.1186/1471-2148-13-25. PMC 3585855. PMID 23360326.

[Ceballos2016-4] Ceballos, G.; E.D. Pardo; L.M Estévez; H.E. Pérez, eds. (2016). Los peces dulceacuícolas de México en peligro de extinción. p. 279. ISBN 978-607-16-4087-1.

[Meyer2006-5] Meyer, A.; W. Salzburger; M. Schartl (2006). "Hybrid origin of a swordtail species (Teleostei: Xiphophorus clemenciae) driven by sexual selection". Molecular Ecology. 15 (3): 721–730. doi:10.1111/j.1365-294X.2006.02810.x. PMID 16499697.