mammals chapter 45. extinct species
TRANSCRIPT
Mammals
Chapter 45
Extinct species
Characteristics of Mammals• mammary glands to feed
young • body covered with hair or fur • live birth • lung breathing • endothermic • diaphragm breathing muscle • four chambered heart • seven cervical vertebrae • pectoral and pelvic girdles-
two pairs of limbs • highly developed brain
cerebrum (emotions) cerebellum (equilibrium and movement)
Endothermy
Respiratory System
Heart comparison
Fish
Frog
Mammal
Circulatory System
Nervous System
Mammal Brain
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Mammal OrdersThere are 19 orders of mammals in the class Mammalia in which 17 nourish unborn young in the placenta, egg laying mammals and marsupials
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Monotremes and MarsupialsOnly 5 percent of all mammalian
species are in the orders Monotremata and Marsupialia.
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Monotremata• Oviparous or egg laying mammals• Only 3 in existence• Duck-billed platypus and two species of
spiny anteaters called echidna.• Not completely endothermic (their body
temperature is lower and fluctuates more than other mammals)
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Marsupials• Marsupials give birth to tiny
immature young that crawl to a pouch on the mothers belly immediately after they are born.
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They attach themselves to milk secreting nipples nursing until they are mature enough to survive outside the pouch.
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250 species of marsupial species exist in Australia, New Guinea, Tasmania, And the Americas
• .
Tasmanian Devil
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American Marsupial
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Placental Mammals
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Characteristics of Placentals• Placental mammals carry unborn young in
the uterus until young can survive in the wild.
• Oxygen and nutrients are transferred from mother’s blood to baby’s blood
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Placental Characteristics
• The placenta is a membrane providing nutrients and waste & gas exchange between the mother and developing young
• Gestation period-is the time which mammals develop in mother’s uterus
Classification of Mammals- teeth
foot structure
toes and fingers, claws and nails
Insectivora
Chiroptera
Rodentia
Lagomorpha
Edentata
Cetacea
Sirenia
Proboscidea
Carnivora
Perissodactyla
Artiodactyla
Primates
Anthropoids