1. Reptile Derivatives Birds and mammals

2. Archaeopteryx = “first” bird

5. Reptilian features teeth, tail, pelvis – no sternum skull features Avian (bird) features feathers, longer front limbs.

7. Shy feathers; insulation

8. Why fly?: to glide from tree to tree or to chase insects?

12. Synapsids = mammal like reptiles

13. Pelycosaurs = Dimetrodon

14. Function of “sail” Camoflage? Swimming? Thermoregulation Note: nasty carnivore

16. Therapsids

17. How to make a Mammal Develop for carnivory = active Hair – warm bloodedness Limbs; under body, toes of equal length Teeth; regionalization, multi roots, cutting Lower jaw – one bone Not there – change in reproduction

19. A definition of mammal = three bones in middle ear, one bone in lower jaw

21. Mammals; monotremes, platypus and echidna Lay eggs.

22. Echidna – egg in pouch, Hatches in 9 days – young in pouch for 12 weeks. Gets milk.

23. Marsupials and Placentals – Parallelism And no eggs

24. Marsupial and placental reproduction; clevage total and equal - blastula forms with inner cell mass

25. Inner cell mass forms layers of cells inside blastula Embryo implants into uterine wall

26. On plate inside embryo – primitive streak forms Get chorion, amnion, allantois and yolk sac Placenta = chorion plus yolk sac in marsupials Placenta = chorion plus allantois in placentals

27. Marsupial pouch with ‘baby’

28. opossum young on nipple. Marsupiaols not primitive, but different Designed for an unpredictable environment – can dump kid to save mother.