The document discusses the different types of invertebrate animals, including arthropods, echinoderms, jellyfish, sponges, worms, and molluscs. Arthropods are the largest group of invertebrates and include insects and arachnids. Sponges have soft bodies covered in holes, while echinoderms like starfish move using millions of feet and have hard parts. Jellyfish have soft bodies and tentacles, and worms have long segmented bodies. Molluscs often have shells like mussels, snails, and squid.

1. N AT U R A L S C I E N C E – U N I T 2 – PA R T 1
3 R D O F P R I M M A RY
INVERTEBRATE ANIMALS
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2. INVERTEBRATES ANIMLAS
• The invertebrates animals has no skeleton.
• There are different types of invertebrate animals:
Arthopods
Echinoderms
Jellyfish
Sponges
Worms
Molluscs
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3. ARTHOPODS
• There are the biggest group of invertebrates.
• Their body are divided in 3 parts: abdomen, head and
thorax.
• They have a hard skin and joints in their legs.
• INSECTS: bees, ants.
• ARACHNIDS: spiders, scorpions.
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4. SPONGES
• They have soft bodies covered with holes.
• They live in the oceans.
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5. ECHINODERMS
• Starfish and sea uchin are echinoderms.
• They have a million feet to move.
• Their bodies have hard parts.
• They live in water.
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6. JELLYFISH
• They live in water.
• The have soft bodies.
• The have tentacles that help them to eat and give them
protection.
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7. WORMS
• They have a longe soft body created by rings.
• Some live in land and others live in water.
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8. MOLLUSCS
• They have a soft body and muscular body.
• Most of them have shells.
One shell: mussel (mejillón)
Two shells: snail (caracol)
Intern shell: squid (calamar)
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9. QUESTIONS
• What are the different groups of the arthopods?
• Which groups has holes in their bodies?
• Which starfish live in?
• Which group has shells in the body?
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10. ACTIVITIES
• 1. Write two animals of each group:
• Insects:
• Arachnids:
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11. ACTIVITIES
• 2. Circle the 6 main invertebrates groups:
jellyfish mammals
fish anthopods sponges
echinoderms warms
Anphibians birds molluscs
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12. JOURNAL
• What’s your favourite animal?
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