Cyprinodon arcuatus
{{Short description|Species of fish}}
{{Speciesbox
| image =
| status = EX
| status_system = IUCN3.1
| taxon = Cyprinodon arcuatus
| authority = Wendell L. Minckley & R. R. Miller, 2002
| extinct = 2011
}}
Cyprinodon arcuatus (Santa Cruz pupfish) is a species of fish in the family Cyprinodontidae. It was endemic to the Santa Cruz River in Arizona. It was last seen in 1973 and was declared extinct in 2011.
Description
The Santa Cruz pupfish exhibited sexual dimorphism in size, with males averaging 37mm (1.46in) in length and females averaging 32mm (1.26in) in length.{{Cite journal |author=W. L. Minckley |author2=Robert Rush Miller |author3=Steven Mark Norris |title=Three New Pupfish Species, Cyprinodon (Teleostei, Cyprinodontidae), from Chihuahua, México, and Arizona, USA |journal=Copeia |volume=2002 |pages=687–705 |date=August 2002 |issue=3 |doi=10.1643/0045-8511(2002)002[0687:TNPSCT]2.0.CO;2|s2cid=86231603 }} Coloration in breeding males was dark green to black with alternating stripes of light and dark. Female and non-breeding males were reported to have clear fins except for a black dorsal fin. C. arcuatus is differentiated from other Cyprinodon species by a highly convex dorsal body and concave post-dorsal body, as well a lack of orange or yellow in breeding males' fins.
References
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{{Taxonbar|from=Q3760866}}
Category:Taxa named by Wendell L. Minckley
Category:Taxa named by Robert Rush Miller
Category:Fish described in 2002
Category:Endemic fauna of Arizona
Category:Endemic fish of the United States
Category:Fish of the Western United States