Egg Size |
Amount of Yolk |
Yolk Distribution |
Cell Division |
Example Animal Groups |
 |
Small Amount (microlecithal or oligolecithal) | Evenly Distributed (isolecithal) | Equal Holoblastic | Amphioxus, Mammals |
 |
Moderate Amount (mesolecithal) | Polar Distribution (telolecithal) | Uneven Holoblastic | Lamprey, Lungfish, Amphibians |
 |
Large Amount (macrolecithal) | Polar Distribution (telolecithal) | Meroblastic | Sharks, Reptiles, Birds |