paleozoic era (570-225 mya) -first vertebrates emerged -first mammal-like … · 2019. 3. 21. ·...
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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
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-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
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1. Limbs and locomotion
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Overview of the primates
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2. Diet and dentition
-generalized; omnivorous
Dental formulas:
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Overview of the primates
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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
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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
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