Placental Mammals

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Placental Mammals

Defining Characteristics


· Reproduce sexually (internal fertilizaiton) by impregnating the female mammal in which the embryo develops and gets it nutrition from the placenta· Placenta (organ) forms inside the uterus of the mother, and the developing fetus is attached to it by an umbilical cord. · Placenta provides: the embryo with the flow of nutrients and oxygen. It removes waste products and carbon dioxide from the mother.· This system helps keep the young in a protective environment of the uterus· The embryo develops from time and nutrients and the mother gives birth to another placental mammal

· The major defining characteristic – placental mammals are nourished through the placenta (of the mother) which allows for a longer developmental period within the protection of the wombBody· Separation of genitals· During the development of the embryo, the body is attached by an umbilical cord· Some (like whales) have a fusiform body and limbs for underwater movement · Some winged mammals have skin membranes supported by elongated forelimbs and fingers.· Subterranean moles have forelimbs modified for digging.· Elephants have columnar limbs and modified foot pads to support great body mass.Brain· Have relatively large brains with two hemispheres that facilitate information betterTeeth· All mostly have teeth· Plant-eating generally have teeth with grinding ridges· Meat-eating have teeth for puncturing and shearing· Rodents - have enlarged, ever-growing incisors used for gnawing· Ant- and termite-eating - use a long, sticky tongue Hair· Hairs are cylindrical structures made primarily of keratin Blood· Warm-blooded because they have the highest metabolic rates of all vertebrates. Their body temperature is slightly higher than marsupials and monotremes (other mammals)· Mammal hearts have four chambers, which allow them to have two separate circuits of blood flow Milk· Have nipples that deliver milk to newborns when sucked. Mammae (sweet glands) of women store fats and indicate fitness in sexual selection.


Placental Mammals

· Proboscidea· Chiroptera· Carnivora· Perissodactyla· Artiodactyla· Cetacea· Sirenia

· Dogs, wolves, foxes· Skunks· Weasels, otters· Raccoons· Bears· Seal and walruses· Cats including lions, tigers, leopards, cheetahs· Mongooses· Dolphins and whales· Elephants· Bats· Horses

Body Structure

Killer Whale

Placenta Link



· Carnivore – only eats meat· Herbivore – only eats plants· Omnivore – eats both




Life Cycle

Campbell, Neil A., Brad Williamson, and Robin J. Heyden. Biology: Exploring Life. Boston: Pearson, 2009. Print.College, OpenStax. "The Placenta." Wikimedia Commons. N.p., n.d. Web. 8 Apr. 2015. .Cullen, Katherine. "human reproduction." Science Online. Facts On File, Inc. Web. 6 Apr. 2015. .Jerry, Mcy. Evolution. Wikimedia Commons. N.p., n.d. Web. 9 Apr. 2015. .Jones, Adam. Rice Farmer Near Hampi Village. Wikimedia Commons. N.p., n.d. Web. 8 Apr. 2015. .Pittman, Robert. Killer Whales Jumping. Wikimedia Commons. N.p., n.d. Web. 8 Apr. 2015. .Pruitt, Sharon D. "Nursery Collection Bubble Blue Overlay." Flickr. N.p., n.d. Web. 8 Apr. 2015. .Rice, Stanley A. "biodiversity of mammals." Science Online. Facts On File, Inc. Web. 6 Apr. 2015. .Simmons, N. B. “Eutheria.” AccessScience. McGraw-Hill Education, 2014. Web. 6 Apr. 2015.Wick, Bob. "King Range National Conservation Area." Flickr. N.p., n.d. Web. 7 Apr. 2015. .Woelber, Paxson. "Curious Raccoon." Wikimedia Commons. N.p., n.d. Web. 8 Apr. 2015. .

· Placental Mammals have the most mammal species. It makes up a fair amount of humanity.· Without humans, there would be no history, no architecture, no mankind, and no new discoveries of other organisms

Key Terms

· Endotherms – warm blooded animals (internally)· Mammary glands – located on the female’s breasts; responsible for producing nutritious milk for their offspring· Placental – used to describe mammals who have placentas – an organ that develops during pregnancy inside a female to produce their offspring

Structure Link

Work Cited

Fun Fact:There are about 4,200 placental mammals


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