Turner, T.F. and Trexler, J.C., 1998. Ecological and historical associations of gene flow in darters (Teleostei: Percidae). Evolution, 52(6), pp.1781-1801.
| Species | Development state | Trait | Primary Data | Secondary Data |
| Etheostoma caeruleum | Egg | Egg size after water-hardening | 1.80 | 1.8 mm |
| Percina copelandi | Egg | Egg size after water-hardening | 1.30 | 1.3 mm |
| Percina nasuta | Egg | Egg size after water-hardening | 1.70 | 1.7 mm |