| Family | genus | species | author | Type Number | Category |
| Ephemerellidae | Caurinella | idahoensis | Allen | 15891 | holotype |
| Ephemerellidae | Ephemerella | altana | Allen | 10031 | holotype |
| Ephemerellidae | Ephemerella | delantala | Mayo | 8643 | holotype |
| Ephemerellidae | Ephemerella | edmundsi | Allen | 9205 | holotype |
| Ephemerellidae | Ephemerella | glacialis carsona | Day | 8626 | holotype |
| Ephemerellidae | Ephemerella | levis | Day | 8627 | holotype |
| Ephemerellidae | Ephemerella | pelosa | Mayo | 8644 | holotype |
| Ephemerellidae | Ephemerella | rama | Allen | 10033 | holotype |
| Ephemerellidae | Ephemerella | sequoia | Allen and Collins | 12720 | holotype |
| Ephemerellidae | Ephemerella | soquele | Day | 8628 | holotype |
| Ephemerellidae | Ephemerella | spinosa | Mayo | 8645 | holotype |
| Ephemerellidae | Ephemerella | verruca | Allen and Edmunds | 9167 | holotype |
| Ephemerellidae | Ephemerella | wilsoni | Mayo | 8646 | holotype |