长鳉（学名：Cyprinodon elegans）为辐鳍鱼纲鲤齿目鲤齿亚目鲤齿鳉科的其中一种，被IUCN列为濒危保育类动物，分布于北美洲美国德州Reeves郡Toyah河及圣索罗门的灌溉沟渠流域，体长可达6.2公分，栖息在泥底质的沟渠、溪流。
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