The Longnose killifish (Fundulus similis) is a freshwater tropical benthopelagic fish of the Fundulus genus and the Fundulidae family. It is endemic to the western Atlantic Ocean, ranging from northern South America to southern North America It can grow up to 12 centimeters in length. The body is rounded, elongate, and olive to silver colored with dark vertical stripes. It can be distinguished from other killifish by its long snout and a dark spot on last vertical bar.