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Xiphophorus. Xiphophorus is a genus of euryhaline and freshwater fishes in the family Poeciliidae of order Cyprinodontiformes, native to Mexico and northern Central America. Xiphophorus species can be divided into 3 groups based on their evolutionary relationships: platyfish (or platies), northern swordtails, and southern swordtails.
A male swordtail. The male green swordtail grows to a maximum overall length of 14 centimetres (5.5 in) and the female to 16 centimetres (6.3 in). The name 'swordtail' is derived from the elongated lower lobe of the male's caudal fin (tailfin). Sexual dimorphism is moderate, with the female being larger than the male, but lacking the 'sword'.
The Chiapas swordtail or upland swordtail ( Xiphophorus alvarezi) is a species of livebearing freshwater fish of family Poeciliidae, and genus Xiphophorus. It is, therefore, in the same genus as the common platy and the swordtail. The Chiapas swordtail was discovered and first described by Donn E. Rosen in 1960, along with four other species of ...
Xiphophorus nezahualcoyotl, the mountain swordtail, is a live bearing fish in the family Poeciliidae. [ 2 ] [ 3 ] It is endemic to the northwestern Pánuco River basin in Mexico. [ 4 ] The specific name of this fish refers to the poet, philosopher and emperor of Texcoco , Nezahualcoyotl (1402-1472).
How humans are scaring fish off finding a mate. Jack Guy, CNN. August 7, 2024 at 5:49 AM. Scientists studying squaretail grouper have found that the increasing presence of fishermen in the water ...
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]
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August 21, 2024 at 9:00 AM. Archaeologists Unearth 1,600 Ancient German Coinsbee32 - Getty Images. A resident of a southwest German town working on a construction project unearthed a stash of ...