底鳉科为辐鳍鱼纲鲤齿目的其中一科。

底鳉科下分4个属，如下：

Fun****dae is the family of topminnows and North American killifishes. The 46 species are native to North America as far south as Yucatan, and to the islands of Bermuda and Cuba, occurring in both freshwater and marine environments.

Members of the family are all small; while the giant killifish (Fundulus grandissimus) and northern studfish (F. catenatus) reach 20 cm (7.9 in) in length, most species are under 10 cm.