b112_Lecture_34c

b112_Lecture_34c - Class Mammalia - Mammals ~4,500 species...

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Class Mammalia - Mammals ~4,500 species extant Hair on epidermis, endothermic 4-chambered heart, diaphragm Mammary glands, internal fertilization, most viviparous, placenta Relatively larger brain, long development time Differentiation of teeth (molars, incisors, etc) Unique jaw and ear anatomy
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Classification of Mammalia Subclass Prototheria Order Monotremata Subclass Metatheria Order Marsupialia Subclass Eutheria – Placental mammals
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Order Monotremata – Platypuses Lay eggs Milk producing glands but no nipples Confined to Australia & New Guinea
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Echidna
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Platypus
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Order Marsupialia Includes opossums, kangaroos, bandicoots After release from the birth canal (~a month or less of gestation), must crawl to marsupium to complete embryonic development Australian marsupials fill many niches filled by eutherians elsewhere
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Didelphis virginiana – Opossum
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Macropus rufus – Red Kangaroo
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b112_Lecture_34c - Class Mammalia - Mammals ~4,500 species...

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