The Order
Cyprinodontiformes
contains these Families:
246. Aplocheilidae [rivulines (rivulins)]
247. Profundulidae [Middle American killifishes]
248. Fundulidae [topminnows and killifishes]
249. Valenciidae [valenciids]
250. Anablepidae [four-eyed fishes]
251. Poeciliidae [poeciliids]
252. Goodeidae [goodeids or splitfins]
253. Cyprinodontidae [pupfishes]