Paleozoic era (570-225 mya) -first vertebrates emerged -first - PowerPoint PPT Presentation

Paleozoic era (570-225 mya) -first vertebrates emerged -first mammal-like reptiles -Pangaea formed Mesozoic era (225-65 mya) -Age of dinosaurs Cenozoic era (65-0 mya) -Age of mammals 1

Continental drift: movement of continents on Earth's surface -plate tectonics moved organisms around the globe during the Paleozoic and Mesozoic eras 2

Mesozoic to Cenozoic Late Mesozoic era: Age of Dinosaurs -earliest mammals Cenozoic era: age of the mammals 3

Three modern mammalian subgroups Monotremes: most ancestral mammals, e.g., they lay eggs 4

Three modern mammalian subgroups Marsupials: immature birth; development continues in mother's pouch 5

Three modern mammalian subgroups Placental: in utero development 6

Mammalian shared derived homologies -Endothermic -Heterodont dentition -Placental -Complex brains and f lexible behavior 7

Overview of the primates -native to tropics and semi-tropics Four categories of Primate homologies 1. Limbs and locomotion 2. Diet and dentition 3. Senses and brain 4. Maturity and behavior Rhesus macaque 8

Overview of the primates 1. Limbs and locomotion 9

Overview of the primates 2. Diet and dentition -generalized; omnivorous Dental formulas: 10

Overview of the primates 3. Senses and brain -color vision and diurnal -stereoscopic vision - eyes are located in front of face -decreased reliance on sense of smell 11

Overview of the primates 4. Maturity and behavior -long life span -long gestation period -few offspring -delayed maturation Behavior -depend more on learned, flexible behavior over pre-packaged instinct -highly social 12