Schuldt, R.J., Heinrich, J.W., Fodale, M.F. and Johnson, W.J., 1987. Prespawning characteristics of lampreys native to Lake Michigan. Journal of Great Lakes Research, 13(3), pp.264-271.
| Species | Development state | Trait | Primary Data | Secondary Data |
| Ichthyomyzon unicuspis | Egg | Oocyte diameter | 0.95 mm (0.91-0.99) | 0.95 mm |