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Maryam Nargolwalla

ANT203 Macroevolution Oct, 04, 2011 Linnaean Classification Taxonomy :dymanics- now organisms relate, reasons behind similarities/differences Classification of humans Kingdom: Animalia (animals) Phylum: Chordata (chordates) Class: Mammalia (mammals) Order: Primates (primates) Family: Hominidae (hominids) Genus: Homo (humans) Species: Homo sapiens *italicize species name  Conventions: o First letter of genus capitalised (Homo) o Species begins with lowercase letter (Homo sapiens) o Genus and species are both italicised (Homo sapiens) o Genus name may be abbreviated (H. sapiens) Kingdom: Animalia  Eukaryotic:  Motile; means they can move around  Heterotrophic ; they are depended on other organisms as a food source  Precambrian Era(~610Ma) Ex. Stromatlite and trilobite Phylum: Chordata  Notochord and nerve cord: flexible joint and rod  Gill slits  Muscles, respiration  Cambrian (~540Ma) *evolved in the Palaeozoic period *ex. Amphioxus, lets us alot about vertibe origins and how these early chordate evolves Subphylum: Vertebrata  Jawless and bony fishes, sharks and rays, amphibians, reptiles, mammals, birds  Segmental spinal column  Developed brain, paired sensory structures (balance, sight, olfaction)  Heads and tails  Closed circulatory system: have heart and blood v vessels  Upper Cambrian (~510Ma) Ex. Agnathans- Agna= jaw hans=less/ lampreys & hagfis, they have fins gills 2 chambered hearts Class: Mammalia  Sweat glands (including mammary glands) produce milk  Hair  Auditory ossicles = 3 bones in ear  Neocortex: are that gives us higher functions in the brain / in human =language  ↑ ontogeny: growth and dev. Animals have it in both  Viviparous: give birth to live youngs  Specialized dentition/heterodont: different kinds of teeths (3insisors :1:4:3molars)  Endothermic: keep body at regulated temperature dispite whats going on outside  Jurassic (~199-145Ma) Mammal Origins -Dimetrodon: mammal like reptile more mammal thn reptile -Steropodon: mammals that layed eggs -Sinodelphis: first evidence of pouched mammals -Eomai: first placental mammal Order: Primates *originated about 65 mya right after the extinction of dinosaurs  Lemurs, lorises, tarsiers, monkeys, apes, humans  Generalized structure (e.g., pentadactyly : 5fingers and toes, ↑ gestation/ ontogeny, dentition, limb structure:allows to move around in a number of way -mammals have specialized dentition  Binocular: front of the sk
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