Vertebrata-mammalia - a sub class Holotheria...

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Vertebrata- Mammalia A. Characteristics 1. Distinguishing features a. hair b. mammary glands- produce milk for young c. differentiation of teeth - canines (cuspids)- holding - incisors- cutting - premolars (bicuspids)- holding - molars- grinding 2. Homoiothermic 3. Heart- 4 chambered 4. Separate pulmonary and systemic circulations 5. Sweat glands- help regulate temperature 6. Nervous system- larger brain a. large, complex cerebrum - cerebral cortex- gray area outside cerebrum 7. Fertilization- internal 8. Examples
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Unformatted text preview: a. sub class: Holotheria- “Monotremes”, duck-billed platypus, spiny anteater (Echinoidea)- oviparous (only egg-laying mammals) b. sub class: Metatheria- Marsupials, kangaroo, koala, opossums- have Marsupium- pouch- viviparous- birthed without being fully developed embryos, then crawl into pouch and clasp on nipple, finish developing in pouch c. sub class: Eutheria- Placental mammals, Ex) humans- have placenta- made of embryo’s and uterus tissue- viviparous...
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This note was uploaded on 04/07/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

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Vertebrata-mammalia - a sub class Holotheria...

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