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Natural Sciences 360 Legacy of Life Lecture 17 Dr. Stuart S. Sumida

Natural Sciences 360 Legacy of Life Lecture 17 Dr. Stuart S. Sumida. Mammals (You are what you eat). Synapsida: Including Modern Mammals (You are what you eat). AMNIOTA. Diadectomorpha(?) Synapsida Reptilia Avialae. Mammalia. “Therapsida”. “Pelycosauria”.

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Natural Sciences 360 Legacy of Life Lecture 17 Dr. Stuart S. Sumida

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  1. Natural Sciences 360 Legacy of Life Lecture 17 Dr. Stuart S. Sumida Mammals (You are what you eat)

  2. Synapsida: Including Modern Mammals (You are what you eat)

  3. AMNIOTA Diadectomorpha(?)Synapsida Reptilia Avialae Mammalia “Therapsida” “Pelycosauria” The Synapsida can be divided into three “grades.”

  4. Mammals: • Mammary glands • Hair • Facial muscles – muscles of facial expression • A specialized jaw joint (between a single bone of the lower jaw (dentary) and the squamosal region of the skull) • Three bones in the middle ear to help in hearing

  5. Mammals have mammary glands for NOURISHING THE YOUNG Mammals have HAIR.

  6. Mammals have muscles of facial expression

  7. Monotremata Metatheria Eutheria (Egg-laying mammals) (Marsupials) (Placental Mammals) Theria Mammalia (detail)

  8. Monotremata Metatheria Eutheria (Egg-laying mammals) (Marsupials) (Placental Mammals) Theria Mammalia Monotremata: known since the Cretaceous

  9. The duck-billed platypus and spiney anteater (Echidna) are members of Monotremata (egg-laying mammals).

  10. Monotremata Metatheria Eutheria (Egg-laying mammals) (Marsupials) (Placental Mammals) Theria Mammalia Metatheria: also known since the Cretaceous

  11. Monotremata Metatheria Eutheria (Egg-laying mammals) (Marsupials) (Placental Mammals) Theria Mammalia

  12. The METATHERIA, also known as MARSUPIALS are often called the “pouch mammals” because although initial development is internal, much takes place in the mother’s pouch – which is technically outside the body.

  13. Kangaroos can be almost orthograde

  14. Monotremata Metatheria Eutheria (Egg-laying mammals) (Marsupials)(Placental Mammals) Theria PRIMITIVE PLACENTAL MAMMALS Mammalia

  15. A Placenta: • Combination of the amniote Chorion and Allantois • Helps the developing embryo to communicate with mother.

  16. PRIMITIVE PLACENTAL MAMMALS were very small. The most primitive living mammals are called insectivores.

  17. Amongst the most primitive lineages of mammals: • Insectivores • Bats • Primates (We’ll talk about • them later.)

  18. Comparative wing structure in flying vertebrates

  19. More derived placental mammals: • Many groups. • Body shape and function is very much determined by diet.

  20. Animation, Mammals, and Science • Physical Laws • Structure • Function • Ontogenetic Stage and Sex • Cutting and Pasting

  21. TRANSVERSEGALLOP ROTARYGALLOP

  22. Primates

  23. PRIMATES “Prosimians” New World Old World “Great Apes” Monkeys Monkeys Hominoidea • Synapomorphies of Primates: • Nails on all digits • Opposable hallux (big toe)* • *later lost in some

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