Microlecithal eggs are eggs which contain a small amount of yolk e.g., Eggs of mammals.
Eggs of human are alecithal i.e,, there is absence of yolk.
Mesolecithal eggs are eggs with moderate amount of yolk e.g., Eggs of amphibians.
Megalecithal eggs are eggs with large amount of yolk e.g., Eggs of reptiles and birds.
Telolecithal eggs are eggs in which yolk present at one pole e.g.. Eggs of amphibians.