| Aplocheiloidei Temporal range:  | |
|---|---|
|   | |
| Aphyosemion elberti | |
|   | |
| Austrolebias quirogai | |
| Scientific classification   | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Chordata | 
| Class: | Actinopterygii | 
| Order: | Cyprinodontiformes | 
| Suborder: | Aplocheiloidei Parenti, 1981 [1] | 
Aplocheiloidei is a suborder of the order Cyprinodontiformes consisting of three families which are commonly known as killifishes.
The three families within the suborder Aplocheiloidei are: [2] [3]
The only known fossil member of the suborder is the Late Miocene-aged Kenyaichthys from the Lukeino Formation of Kenya, which is the only known member of the family Kenyaichthyidae Altner & Reichenbacher, 2015. [4]
Some authorities have lumped the three families into a single family, Aplocheilidae, a well-established name, chosen for its stability in usage over time, and to avoid the impact of a new name at the family rank for a popular aquarium fish group. [3] Under this proposal, the Aplocheilidae includes three subfamilies: Aplocheilinae for the species from Asia, Madagascar and the Seychelles; Cynolebiinae (called Rivulidae above) for the species from the Americas; and Nothobranchiinae for the species from the African mainland. [5]