Becker, George C. / Fishes of Wisconsin
Killifish family - cyprinodontidae, pp. 753-765 ff. PDF (5.2 MB)
Killifish Family Cyprinodontidae Three species of killifish in one genus occur in Wisconsin. Only one species has a wide north-south distribution in the state; the other two appear in southern Wisconsin as the northernmost populations of south- ern forms. The family Cyprinodontidae is represented by 48 species in 10 genera in the United States and Canada, a number of which are both marine and freshwater in habit (Robins et al. 1980). The family includes the Devils Hole pupfish, Owens River pupfish, Comanche Springs pupfish, and Pahrump killifish of the southwest, all of which are endangered and have been the subjects of congressional conservation measures. The killifish are small fishes which inhabit shallows and are adapted to surface feeding. Their jaws have well-developed teeth, their heads are flattened above, and they have small, more or less dorsal mouths. The gill membranes are free from the isthmus, and the scales are cy- cloid. Killifish possess soft-rayed fins; a single dorsal fin is located pos- teriorly. In adult killifish, the duct between the swim bladder and the pharynx is lost (physoclist). 753
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