Bakar, J.A. and Heins, D.C., 1994. Reproductive life history of the North American madtom catfish, Noturus hildebrandi (Bailey & Taylor 1950), with a review of data for the genus. Ecology of Freshwater Fish, 3(4), pp.167-175.
| Species | Development state | Trait | Primary Data | Secondary Data |
| Noturus hildebrandi | Egg | Oocyte diameter | 0.76-2.25 | 1.5 mm |
| Noturus hildebrandi | Egg | Oocyte diameter | 1.64 | 1.64 mm |
| Noturus hildebrandi | Egg | Oocyte diameter | 2.25-2.58 | 2.42 mm |
| Noturus hildebrandi | Egg | Oocyte diameter | 2.41 | 2.41 mm |