By Max Ventura

1. MARSUPIALSAND

MONOTREME

Reason for name- derives from «marsupium» (pouch in latin).

334 extant species.Characteristics:a. Frontal pouch.b. Give birth to relatively undeveloped young.c. Ossified patellae is absent.d. Have epipubic bones.e. Lack Corpus callosum.Fossil record- 125 million years agoLife expectancy- varies greatly, Ex: Virginia Possum

lives 2-4 years, Kangaroo lives 20.

MARSUPIALS

Life Cycle- Marsupials are born very undeveloped and evolve in their mother’s pouch for the next weeks or months. Mothers care for their babies until they’re as big as they are. When the «baby» abandons its mother it mates with the opposite sex.

Eating and Digestive system- Omnivores.

MARSUPIALS CONTINUED…

Respiratory and Circulatory System- have ancestral condition mammal lungs at birth. 4 chambers in heart.

Have the right and left ventricles of the heart separated, so that lung and body circulations are independent from each other. The oxygenated blood from the lungs passes into the left atrium and enters the left ventricle, where it is forced through the aorta and into the systemic circulation. Deoxygenated blood from the tissues returns to the right atrium via the vena cava, and is pumped to the pulmonary capillary bed.

MARSUPIALS AND MONOTREMES

Sensory System- Rely mostly on smell, have good hearing, rudimentary eyes and taste is used such as humans.

MARSUPIALS AND MONOTREMES

Reason for name- derives from Greek monos-single, trema-hole, refering to cloaca.

5 extant species.Characteristics-a. Warm-blooded.b. Lack Corpus Callosum.c. Cloaca.d. Produce milk.e. Lay eggs.Fossil record- 123 million

years ago.

MONOTREMES

Life Expectancy- some over 50 yearsLife Cycle- Live long, don’t reproduce much and

parents have prolonged care of their offspring.Eating and Digestive system- Platypus, carnivore.

The platypus gathers food with its bill and moves it to the cheek pouches. Then, the food will be moved back to its mouth where it is munched before being swallowed. Inedible products such as shells or mud are then expelled through serrations on the sides of the jaw during the grinding process. Once in the stomach, the platypus doesn’t produce acids or enzymes to help digest like other mammals; instead the stomach has a horny lining which further grinds the food before absorption.

MONOTREMES CONTINUED…

http://honorsbiologyp7.wikispaces.com/P7+Monotremes+and+Marsupials+Sensory+Systems

http://www.newworldencyclopedia.org/entry/Monotreme#Physiology_and_behavior

http://www.helium.com/items/1096293-eating-habits-of-the-platypus

http://en.wikipedia.org/wiki/Marsupialhttp://en.wikipedia.org/wiki/Monotreme

BIBLIOGRAPHY