Xiphophorus nigrensis
Xiphophorus nigrensis | |
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Male | |
Female | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Actinopterygii |
Order: | Cyprinodontiformes |
Family: | Poeciliidae |
Genus: | Xiphophorus |
Species: | X. nigrensis
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Binomial name | |
Xiphophorus nigrensis D. E. Rosen, 1960
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Xiphophorus nigrensis, the Panuco swordtail, is a species of fish in the
Taxonomy
Being a small
Description
The body of Xiphophorus nigrensis is larger and deeper than that of X. pygmaeus. The males possess on their caudal fin a moderately to well-developed sword set off by a black line, from which the
Populations regularly contain both large (up to 40 mm) and small adult males (down to 18 mm).[5] Large males possess swords, while small males do not. Small males are slender and of solid gold color.[7]
Distribution and habitat
Xiphophorus nigrensis is found in Rio Choy.[7] The species inhabits clear, deep, fast-flowing waters along undercut slopes of river and stream beds. The depth can be as great as 3 m (9.8 ft).[5]
Reproduction
Xiphophorus nigrensis readily hybridizes with X. pygmaeus; in fact, females of the latter species prefer X. nigrensis males to those of their own species because large X. nigrensis males court females while X. pygmaeus males merely sneak up and chase them instead. Small X. nigrensis males also exhibit sneak-chase behavior.[8]
References
- ^ . Retrieved 19 November 2021.
- ^ Froese, Rainer; Pauly, Daniel (eds.) (2019). "Xiphophorus nigrensis" in FishBase. August 2019 version.
- ^ "Xiphophorus nigrensis". Retrieved 12 Sep 2012.
- PMID 23360326.
- ^ a b c d e Donn Eric Rosen (1960). "Middle-American poeciliid fishes of the genus Xiphophorus". Bulletin of the Florida State Museum. Biological Sciences. 5 (4). University of Florida: 100–102, 187.
- ^ "Livebearers". Tropical Fish Hobbyist. Vol. 54, no. 5–8. 2006. p. 108.
- ^ .
- S2CID 20181010.