Animal Classification

Animal Classification:

Vertebrates:

Exothermic – “cold blooded”
Body temperature changes with environment

Endothermic – “warm blooded”
Maintain their body temperature

HAVE A BACK BONE

BILATERAL SYMMETRY

Invertebrates:

Do Not have a backbone

Bilateral symmetry
Radial symmetry
Assymetry

97% of Animals

Mostly Exothermic – “cold blooded”

Body temperature changes with environment

Vertebrates FISH:

• Hollow nerve chord in their backs
• - Gills to breathe
• - Tail behind the anus
• - Exothermic

BONY FISH:

1. Bones
2. - Overlapping scales covered with mucus
3. - Paired appendages (fins)
4. 95% of all fish

JAWLESS FISH:

1. - Cartilage (not bones)
2. - No scales
3. - Long bodies (like a snake)
4. - No paired appendages
5. - No jaws
6. - First vertebrates on earth
7. e.x. Lamprey

CARTILAGENOUS FISH:

1. - Cartilage (not bones)
2. - Rough scales
3. - Nostrils
4. - Most are predators
5. Ex. Shark

AMPHIBIANS

- Spend part of their life in water/on land

- Breathe through their moist scale-less skin

Exothermic

- Hibernate – inactive during cold times

Estivate – Inactive during hot times

REPTILES:

- Thick, dry and scaly skin    (Prevents dehydration and injury)

                             -Exothermic

                             -Breathe with lungs

               -Lay eggs

BIRDS:

- Covered with feathers

Endothermic

- Strong hollow bones

- Many…but not all fly

- Front legs are modified into wings

- Keep their eggs warm until they hatch

MAMMALS:

Females produce milk in mammary gland

Endothermic

Have hair/fur on their body

Monotremes                            Marsupials                  Placental Mammals

Lay eggs                                 - Have pouches                - Babies develop in

                                              for baby development            female’s  body.

INVERTEBRATES: PRORIFERA

Sea Sponges

Simplest Animals

They do not move to search for food

Bodies are made of 2 layers of cells

Asymmetry

Cnidarians:

Have stinging tentacles to capture prey

Hollow bodies

Bodies are made of 2 layers of cells

Radial Symmetry

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