n = 8
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Chasmistes brevirostris | Cope, 1879 | Chasmistes brevirostris | Catostomidae | Shortnose sucker |
| Chasmistes cujus | Cope, 1883 | Chasmistes cujus | Catostomidae | Cui-ui |
| Chasmistes fecundus | (Cope & Yarrow, 1875) | Chasmistes fecundus | Catostomidae | |
| Chasmistes liorus | Jordan, 1878 | Chasmistes liorus | Catostomidae | June sucker |
| Chasmistes liorus liorus | Jordan, 1878 | Chasmistes liorus | Catostomidae | June sucker |
| Chasmistes liorus mictus | Miller & Smith, 1981 | Chasmistes liorus | Catostomidae | June sucker |
| Chasmistes luxatus | Cope, 1879 | Deltistes luxatus | Catostomidae | Lost River sucker |
| Chasmistes muriei | Miller & Smith, 1981 | Chasmistes muriei | Catostomidae | Snake River sucker |