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

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Continental drift: movement of continents on Earth's surface

-plate tectonics moved organisms around the globe during the Paleozoic and Mesozoic eras

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Mesozoic to CenozoicLate Mesozoic era: Age of Dinosaurs-earliest mammals

Cenozoic era: age of the mammals

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Three modern mammalian subgroups

Monotremes: most ancestral mammals, e.g., they lay eggs

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Three modern mammalian subgroupsMarsupials: immature birth; development continues in mother's pouch

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Three modern mammalian subgroupsPlacental: in utero development

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Mammalian shared derived homologies

-Endothermic

-Heterodont dentition

-Placental

-Complex brains andflexible behavior

-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 behavior8

Overview of the primates

Rhesus macaque

1. Limbs and locomotion

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Overview of the primates

2. Diet and dentition

-generalized; omnivorous

Dental formulas:

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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

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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

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Overview of the primates