Back Œuf amniotique French

Cleidoic egg

European starling (Sturnus vulgaris) eggs in nest
Schematic of a chicken egg: 1.Eggshell 2.Outer membrane 3.Inner membrane 4.Chalaza 5.Exterior albumen (outer thin albumen) 6.Middle albumen (inner thick albumen) 7.Vitelline membrane 8.Nucleus of pander 9.Germinal disk (blastoderm) 10.Yellow yolk 11.White yolk 12.Internal albumen 13.Chalaza 14.Air cell 15.Cuticula
Dinosaur eggs from Mongolia
Eggs of the Common Quail (Coturnix coturnix), compared to a chicken's egg

The cleidoic egg (from Greek kleistos = closed) is the type of egg which reptiles and birds lay. Mammalian reproduction has evolved from laying cleidoic eggs to live birth. The cleidoic egg is sometimes called the amniotic egg, because it is characteristic of amniotes.

From Wikipedia, the free encyclopedia · View on Wikipedia

Developed by Tubidy