Class Reptilia

• Reptiles have dry and cornified skin, epidermal scales or scutes
• Lizards and Snakes shed their scales as skin cast
• Reptiles have two pairs of limbs if present.
• Reptiles have crawling mode of locomotion.
• Reptiles have three chambers heart [but Septum separates ventricle]. 4 chambered heart in crocodile.
• Tympanum In reptiles represents ear.
• Reptiles are Poikilotherms.
• Reptiles have well developed alimentary canal.
• Reptiles respire by lungs
• Reptiles have internal fertilization, are oviparous and development is direct.