amniotic egg. A shelled, water-retaining egg with four membranes that enables reptiles, birds, and egg-laying mammals to complete their life cycles on dry land.
amnion-thin innermost membranous sac that surrounds the developing embryo of higher vertebrates (reptiles, birds and mammals) that secretes amniotic fluid
amniotic fluid-fluid inside the amnion that helps give an environment that maintains chemical consistancy and temperature stability
yolk sac-2nd membrane enclosing the yolk of eggs full of nutrients loaded with proteins and fats
allantois-3rd membrane which stores metabolic waste; grows over time and eventually acts a respiratory surface exchanging oxygen and carbon dioxide
chorion-4th and outermost protective membrane fused to allantois while supporting the allantois's function of gas exchange
leathery shell-The eggs of Class Reptilia are specialized and adapted for land
cleodic egg-amniotic egg with a shell that is either leathery of hard
