| Family | Scientific Name | Author | Year | Common Name |
| Fundulidae | Fundulus diaphanus | (Lesueur) | 1817 | Banded Killifish |
Fundulus diaphanus
Unique Characters: Lateral scales 35-50. Depth of caudal peduncle 2.0-2.8 times in the length of the caudal peduncle. Gill rakers 4-5.
Similar Species:
“Lake Phelps” Killifish
Fundulus sp.
Waccamaw Killifish
Fundulus waccamensis
Fundulus sp.
“Lake Phelps” Killifish Fundulus sp.. Only occurs in Lake Phelps. Usually 54-64 lateral scales. Genetically distinct from Fundulus diaphanus and F. waccamensis.
Waccamaw Killifish Fundulus waccamensis. Occurs only in Lake Waccamaw. Slender body. Usually has 54-64 lateral scales.
Mummichog
Fundulus heteroclitus
Marsh Killifish
Fundulus confluentus
Mummichog Fundulus heteroclitus. Black spot on back in front of dorsal fin. Rounded caudal fin, blunt snout, and stout body. Dorsal fin origin slightly in front of anal fin origin. Male often has dark spot/blotch in dorsal fin. Gill rakers 9 or 10.
Marsh Killifish Fundulus confluentus. Pale, often golden spot on body at base of dorsal fin. Ocellated black spot in dorsal fin of female. Gill rakers 5. Caudal fin rounded. Occurs primarily in brackish or salt water.
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