 Fundus is Latin for "bottom," and probably refers to the muddy substrate many common species inhabit and the propensity for fish to hide from predators in sediments.Killifish derives from the Dutch word "kill," meaning a stream or brook; it is a general name given to egg-laying toothcarps.The genus "Fundulus" contains 38 extant species, found along U.S. coastal and inland regions, Bermuda, Cuba, and Yucatán.