Any of a number of tiny fish in the Cyprinodontiformes order of ray-finned fish.
Related
Narrower meaning words
Aplocheilidae (family), Cyprinodontidae, Fundulidae, Nothobranchiidae (family), Profundulidae (family), Rivulidae (family), Valenciidae (family) - families in Cyprinodontiformes with species called killifish
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