Gambusia clarkhubbsi (San Felipe Gambusia) is described from San Felipe Creek, a spring-fed Rio Grande tributary in Del Rio, Texas. The new species is distinguished from other members of the Gambusia nobilis species group by a combination of morphometric and pigmentation characters. It appears to prefer thermally consistent spring flows and is apparently most common in edge habitats adjacent to flowing waters.
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Vol. 2003 • No. 4