Invertebrates
3.3.7.A Describe the similarities and
differences that characterize diverse living
things; describe how the structures of living
things help them function in unique ways
Invertebrate
• SPONGEBOB
• HEARS
• WEIRD
• MUSIC
• AT
• SQUIDWARD’S
Definitions
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Invertebrate – Animal without a backbone
Vertebrate – Animal with a backbone
Regenerate – Regrow missing part
Scavenger – Animal that eats dead
animals
• Parasite – Animal that lives inside and
harms other animals
• Molting – Shedding skin
Sponges
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Simplest invertebrate
Pores
No nervous system
No complex organs
Live in water
Can regenerate
Uses:
Uses:
• Washing
• Painting
Examples:
• Freestanding
• Encrusting
Hollow-Bodied
• Hollow center and one
opening
• Live in water
• Look like plants
• Attach to rocks
• Some float or swim
• One large opening or
mouth
• Mouth makes them more
complex than sponges
• Tentacles
• stingers
Examples:
•Sea Anemone
•Jellyfish
•Coral
Uses:
•Jewelry
•Decoration
Worms
• Soft bodies
• Three groups –
flatworms, roundworms,
segmented worms
• Regenerate
• Some live in water, some
on land, some inside the
bodies of other animals
(called parasites)
• Some are scavengers
(eat dead animals)
• Complex organs
Uses:
• Fishing
• Good for Soil
Examples:
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Earthworm
Tapeworm
Planarian
Roundworm
Mollusks
• Invertebrates with soft
bodies
• Have shells
• Shells provide protection
• Some live in fresh or salt
water
• Some live in moist places on
land
• Special organs for moving,
breathing, getting food, and
pumping blood
• Footlike part for moving,
digging, and feeling
Uses:
• Food
• Decoration
Examples:
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Mussels
Oysters
Clams
Snails
Octopus
Squid
Arthropods
• Largest group of animals
(75% of all animals)
• Exoskeleton (outside
skeleton for protection)
• Live in water and on land
• Some fly
• Special body parts for
special jobs
• Molts
• Jointed legs
• Body sections, 3 or 4
pairs of legs
• Bilateral Symmetry
Uses:
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Food
Pets
Entertainment
Pest Control
Examples:
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Lobster
Grasshopper
Spider
Tick
Spiny-Skinned
• Sharp spines on the
outside of their bodies.
(Protection)
• Tube Feet – Tiny,
suctionlike cups used for
moving, feeling and
feeding.
• Regenerate
• Many characteristics of
adult spiny-skinned
animals are not as
complex as arthropods,
but young spiny-skinned
animals are more complex
than young arthropods.
Uses:
• Food
• Decoration
• Collecting
Examples:
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Sea Cucumber
Starfish
Sea Urchin
Sea Star
Sand Dollar