InvertebratesInvertebrates

Goal:Goal:

Students will know the 8 invertebrate phylaStudents will know the 8 invertebrate phyla

What is an invertebrate?What is an invertebrate?

An animal that does not have a backboneAn animal that does not have a backbone

Plural of phylumPlural of phylum The group below kingdomThe group below kingdom

What is phyla?What is phyla?

Sponges (Porifera)Sponges (Porifera)

Sponges (Porifera)Sponges (Porifera)

AsymmetricalAsymmetrical

Lives in waterLives in water

Filter their food out of waterFilter their food out of water

Cnidarians (Cnidaria)Cnidarians (Cnidaria)

Cnidarians (Cnidaria)Cnidarians (Cnidaria) Radial symmetryRadial symmetry

Reproduce sexually and asexuallyReproduce sexually and asexually

Catch food using stinging cellsCatch food using stinging cells

Example: Jellyfish, Sea anemoneExample: Jellyfish, Sea anemone

Flatworms Flatworms (Platyhelminthes)(Platyhelminthes)

Flatworms Flatworms (Platyhelminthes)(Platyhelminthes)

Bilateral symmetryBilateral symmetry

Most are parasitesMost are parasites

Flat bodyFlat body

Simplest organism with a brainSimplest organism with a brain

Examples: Planarian, TapewormExamples: Planarian, Tapeworm

Roundworms (Nematoda)Roundworms (Nematoda)

Roundworms (Nematoda)Roundworms (Nematoda) Bilateral symmetryBilateral symmetry

Most are parasitesMost are parasites

round bodyround body

One-way digestive systemOne-way digestive system

Example: Guinea wormExample: Guinea worm

Segmented Worms Segmented Worms (Annelida)(Annelida)

Segmented Worms Segmented Worms (Annelida)(Annelida)

Bilateral symmetryBilateral symmetry

round body divided into segmentsround body divided into segments

Closed circulatory systemClosed circulatory system

Ex: earthwormEx: earthworm

Mollusks (Mollusca)Mollusks (Mollusca)

Mollusks (Mollusca)Mollusks (Mollusca) Bilateral symmetryBilateral symmetry

Soft bodiedSoft bodied

open circulatory systemopen circulatory system

Ex: squid, snail, octopusEx: squid, snail, octopus

Arthropods (Arthropoda)Arthropods (Arthropoda)

Arthropods (Arthropoda)Arthropods (Arthropoda) Bilateral symmetryBilateral symmetry

exoskeletonexoskeleton

Segmented bodiesSegmented bodies

Subgroups:Subgroups: ArachnidsArachnids InsectsInsects CrustaceansCrustaceans CentipedesCentipedes MillipedesMillipedes

Echinoderms Echinoderms (Echinoderma)(Echinoderma)

Echinoderms Echinoderms (Echinoderma)(Echinoderma)

Radial symmetryRadial symmetry

EndoskeletonEndoskeleton

Water vascular systemWater vascular system

Ex: sea star, sea urchinEx: sea star, sea urchin