6 HerpetologyThe field of science that studies reptiles and amphibians.
7 SkinDry thick skin covered with scales; Scales are part of the skin- all connectedScales provide protection from water loss and protection from predators.Scales are made of keratinKeratin is protein in the epidermis, often modified into nails, horns, and hair
8 Skin cont… Skin consists of 2 layers Epidermis- thin layer, and shed periodicallyDermis- Thicker layer, contains chromatophores which give reptiles their color
13 Circulation Most reptiles have 3 chambered hearts. Crocodiles have a 4 chambered heart that enables more oxygen to reach body tissues.
14 Ectothermic All reptiles are ectothermic. Do not inhabit extremely cold regions.Live in temperate, tropical and desert climates.
15 Reproduction Reptiles do not need water to reproduce. Separate Sexes Internal FertilizationMost lay leathery or calcareous eggs, with the embryo developing after the egg is laidYoung look like small adultsMost do not provide parental care.
16 The Amniotic EggThe evolution of the amniotic egg was the adaptation that freed reptiles from dependence on water for reproduction.Amniotic Egg is a shelled egg that contains food and protective membranes for supporting embryonic development.
17 Parts of the Amniotic Egg 1. amnion- cushions; prevents dehydration2. outer shell- protection3. allantois- waste sac4. yolk- food supply5. albumin- additional food6. chorion- gas exchange