Bio 1134 Lab Practical 2 Animals pt 2

What is the key characteristic of the Superclass Tetrapoda?

1) Four-limbed organisms

Name three classes under the Superclass Tetrapoda

1) Amphibia
2) Reptilia
3) Mammalia

What are the key characteristics of the Class Amphibia?

1) Lay anamniotic eggs
2) Cold-blooded
3) Smooth skin, no scales

Name two organisms from the Class Amphibia

Frogs and Salamanders

What are the key characteristics of the Class Reptilia?

1) Dry, scaly skin
2) Cold-blooded

Name two organisms from the Class Reptilia

Lizards and Snakes (Birds are classified as reptiles due to their feathers originating from scales)

What are the key characteristics of the Class Mammalia?

1) Has hair or fur
2) Has horns or antlers
3) Mammary glands

What three things are classified under the Class Mammalia?

1) Monotremes
2) Marsupials
3) Placentals

What two subclasses are under the Class Mammalia?

1) Prototheria
2) Theria

What are the key characteristics of the Subclass Prototheria?

1) Primitive
2) Mammary glands without nipples
3) No external ear

Name two organisms from the Subclass Prototheria

Platypus and Echidnas

What is the key characteristic of the Subclass Theria?

1) Gives live birth, without shelled eggs

Name two infraclasses under the Subclass Theria

1) Metatheria
2) Eutheria

What are the key characteristics of the Infraclass Metatheria?

1) Gives live birth
2) Young live in pouch until they fully develop
3) Marsupial mammals

Name two organisms from the Infraclass Metatheria

Kangaroos and Wombats

What are the key characteristics of the Infraclass Eutheria?

1) Gives live birth
2) Young are born fully physically developed
3) Placental mammals

Name two organisms from the Infraclass Eutheria

Humans and Elephants