WILD 3580 1st Edition Lecture 35 Outline of Last Lecture I Migration Outline of Current Lecture I Characteristics of Mammals II Mammalian Evolution III Mammalian Classification Current Lecture I II Characteristics of Mammals 1 Single bone in the lower jaw dentary a Dentary squamosal jaw articulation b Quadrate articular jaw articulation non mammal 2 Three middle ear ossicles a Malleus used to be the articular bone b Incus used to be the quadrate bone c Stapes 3 Secondary Palate a Separates the oral cavity from the nasal cavity b Facilitate efficient respiration through nose than just mouth for nursing 4 Hair a Insulation 5 Mammary glands a Provide nourishment to the young 6 Enucleate erythrocytes a Red blood cells lack a nucleus b Carry more oxygen more surface area Mammalian Evolution Mid to late Triassic period of Mesozoic Era Synapsid group single temporal opening Amniota diverged to reptiles and mammals Mesozoic Mammals o Rare in most areas of the world These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III o Small o Nocturnal Dinosaurs dominated most terrestrial niches i Smaller mammals evolved hair as a form of insulation ii Active during night Mammals start really diversifying throughout the Cenozoic Era Almost exponential growth a 2 major worldwide events 1 Extinction of dinosaurs 2 Breakup of Pangea Isolation local adaptation divergence speciation Mammalian Classification a Class Mammalia 5416 species b Subclass Prototheria monotremes Platypus i 1 order 2 families 3 species c Subclass Theria i 2 infraclasses 1 Metatheria marsupials a 7 orders 2 Eutheria a 21 orders
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