Diamond Darter
Crystallaria cincotta
- Critically endangered
- Card rarity: Legendary
- Fish

The diamond 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 named for the sparkling light it reflects during nighttime collections. The diamond darter was first described in 2008 and is only the second known member of its genus, which also includes the crystal darter, C. asprella. On July 26, 2013, the United States Fish and Wildlife Service formally designated the diamond darter as an endangered species under the Endangered Species Act of 1973.
Classification
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Percidae
- Genus
- Crystallaria