Animals

Vertebrates Invertebrates Characteristics Characteristics

• An internal skeleton

articulated

• A spine or backbone

that supports the body

• A cranium that

protects the brain

• Legs, wings or fins

They are classified into five gropus

• An external skeleton

o exoskeleton.

• No bones or spines or

cranium

• Legs, wings, simetric

body or antennaes

They are classified into six groups

Classification

Vertebrates

Invertebrates

1. Mammals

2. Fish

3. Amphibia

ns

4. Reptiles

5. Birds

1. Arthropods

2. Mollucs

3. Worms

4. Echinoderm

s

5. Cnidarians

6. Sponges

Mammals

• Viviparous

• Mother’s milk

• Hair or fur

• Four legs

• Fins

• Warm- blooded

Fish• Oviparous

• Fins

• Bony scales

• Gills

• Lateral line

Birds• Oviparous

• Wings

• Feathers

• Constant body temperature

• Beak

• Lungs

• Nests

Reptiles• Oviparous

• Cold- blooded

• Scales

• Four legs or none

• Limbs

Amphibians• Oviparous

• Skin: moist and slimy

• Four legs

• Breathe through skin and lungs

• Metamorphosis

Arthropods

• Exoskeleton

• Crustaceans : ten legs

• Arachnids : eight legs

• Myriapods : many legs and long body

• Insects: six jointed legs

Molluscs• Moist body

• Protected by a shell

• In water

• On land

• Gastropods

• Bivalves: two valves

• Cephalopods: eigth to ten tentacles

Worms• Long body

• No legs

• In water

• On land

• By wriggling

Echinoderms

• Radial simetry

• Hard plates under their skin

• Spines ( some of them)

Cnidarians• Jelly- like body

• Radial simetry

• Soft tentacles

• One open mouth and anus

Sponges• The symplest animal

• Irregular in shape

• Holes on its body

• In water