| Eocypselus Temporal range:
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|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Clade: | Strisores |
| Order: | Apodiformes |
| Family: | †Eocypselidae |
| Genus: | †Eocypselus Harrison, 1984 |
| Type species | |
| †Eocypselus vincenti Harrison, 1984
| |
| Other species | |
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Eocypselus is a genus of prehistoric birds believed to be ancestral to modern hummingbirds and swifts.[1]