| Pupfishes (Cyprinodontidae) | ||
|---|---|---|
| # | characteristics | results |
| 1a | Breast and belly unscaled, tricuspid teeth present, and no mandibular pores. | Cyprinodon rubrofluviatilis (Red River Pupfish) |
| 1b | Belly scaled or only partly scaled | go to 2 |
| 2a | 7 anal soft fin rays, dark blotches on underside, and 2 mandibular pores. | Cyprinodon bovinus (Leon Springs Pupfish) [endangered] |
| 2b | 9-11 anal soft fin rays, very deep bodied, and black edge on edge of caudal fin. | Cyprinodon variegatus (Sheephead Minnow) |