Northern Tessellated Darter
Etheostoma olmstedi
- Least concern
- Card rarity: Common
- Fish

The tessellated darter is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is native to Canada and the United States. It was formerly considered a subspecies of the johnny darter, which it greatly resembles in general appearance.
Classification
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Percidae
- Genus
- Etheostoma