1a |
Large mouth, red or brown spots forming horizontal lines |
Fundulus dispar (Starhead Topminnow) |
1b |
Small to normal sized mouth |
go to 2 |
2a |
Thick/dark midlateral stripe present |
go to 3 |
2b |
Thin or nonexistent midlateral stripe |
go to 4 |
3a |
Numerous small dark specks on body (especially posterior) and the more posterior fins (anal, dorsal, and caudal) |
Fundulus olivaceus (Blackspotted Topminnow) |
3b |
Faint or absent dark specks on body (especially posterior) and on caudal, anal, and dorsal fins. |
Fundulus notatus (Blackstripe Topminnow) |
4a |
Scales outlined with melanophores, body laterally compressed, and mouth superior. |
Lucania parva (Rainwater Killifish) |
4b |
Melanophores not present |
go to 5 |
5a |
Lower jaw protrudes farther than upper jaw. |
Fundulus grandis(Gulf Killifish) |
5b |
Jaws are in line |
go to 6 |
6a |
Snout is long (visually about twice as long as the diameter of the eye, looks stretched) |
Fundulus similis (Longnose Killifish) |
6b |
Short snout |
go to 7 |
7a |
Terminal mouth and body has dark vertical bars (makes overall body looked striped hence the species name zebrinus) |
Fundulus zebrinus (Plains Killifish) |
7b |
Superior/sub terminal mouth and golden or red flecks present on body (especially posterior) and caudal fin. Note: redish specks are present only on larger breeding age males. |
*Fundulus chrysotus (Golden Topminnow) |