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

• 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• 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:• Earthworm• Tapeworm• Planarian• Roundworm

MollusksUses:• Food• Decoration

Examples:• Mussels• Oysters• Clams• Snails• Octopus• Squid

• 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

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:• Food• Pets• Entertainment• Pest Control

Examples:• 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:• Sea Cucumber• Starfish• Sea Urchin• Sea Star• Sand Dollar