| Family | Scientific Name | Author | Year | Common Name |
| Fundulidae | Fundulus heteroclitus | (Linnaeus) | 1766 | Mummichog |
Fundulus heteroclitus
Unique Characters: Jaw teeth in more than a single row. 9 or more scale rows between origin of dorsal fin and origin of anal fin. Dorsal fin origin over or anterior to anal fin origin. Dorsal-fin soft rays 10-15. Mouth level with, or slightly above, a horizontal line drawn through the middle of the eye. Origin of dorsal fin distinctly anterior to origin of anal fin, more pronounced in males. Males with dark and silvery vertical bars on side of body, silvery dots between bars.
Similar Species:
Spotfin Killifish Fundulus luciae
Striped Killifish
Fundulus majalis
Marsh Killifish Fundulus confluentus
Spotfin Killifish Fundulus luciae. Jaw teeth in more than a single row. 9 or more scale rows between origin of dorsal fin and origin of anal fin. Dorsal fin origin distinctly behind origin of anal fin. Dorsal-fin soft rays 8-11.
Striped Killifish Fundulus majalis. Jaw teeth in more than a single row. 9 or more scale rows between origin of dorsal fin and origin of anal fin. Dorsal fin origin over or anterior to anal fin origin. Dorsal-fin soft rays 10-15. Mouth distinctly below a horizontal line drawn through the middle of the eye.
Marsh Killifish Fundulus confluentus. Jaw teeth in more than a single row. 9 or more scale rows between origin of dorsal fin and origin of anal fin. Dorsal fin origin over or anterior to anal fin origin. Dorsal-fin soft rays 10-15. Mouth level with, or slightly above, a horizontal line drawn through the middle of the eye. Origin of dorsal fin more or less over origin of anal fin. Males with numerous dark vertical bars on side of the body but lacking silvery dots.
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