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Science: Invertebrates – Animals without Backbones

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Protozoa

Single Cell Organisms

Microscopic

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Amoeba

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Paramecium

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Euglena

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Trypanosoma

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Coelenterates

Soft bodies

Stinging cells

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Jellyfish

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Sea Anemone

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Coral

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Hydra

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Sea Pen

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Sea Fan

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Flatworms

Simple

Soft bodied

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Tape Worm

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Fluke

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Annelid Worms

Segmented bodies

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Earthworm

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Leech

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Molluscs

Soft bodied

Most have shells

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Molluscs: Gastropoda

All snails and slugs including abalone, limpets, conch, nudibranchs, sea hares, sea butterflies.

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Snail

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Slug

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Abalone

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Limpet

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Conch

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Nudibranch

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Sea hare

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Sea butterfly

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Molluscs: Bivalvia

clams, oysters, scallops, geoducks, mussels, rudists (extinct)

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Clam

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Oyster

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Scallop

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Geoduck

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Mussel

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Molluscs: Polyplacophora

chitons

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Chiton

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Molluscs: Cephalopoda

squid, octopuses, cuttlefish, nautiluses, Spirula, belemnites (extinct), ammonites (extinct)

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Squid

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Octopus

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Cuttlefish

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Nautilus

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Spirula

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Molluscs: Scaphopoda

tusk shells

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Tusk shell

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Echinoderms

Spiny sea creatures

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Feather stars

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Starfish

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Sea Urchin

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Arthropods

Hard external skeleton

Jointed limbs

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Arthropods: Arachnids

Eight legs

Two body parts

No antennae

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Spider

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Scorpion

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Arthropods: Crustaceans

Mostly sea creatures

Many legs

Two sets of antennae

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Crab

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Lobster

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Prawn

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Krill

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Barnacle

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Arthropods: Insects

Wings

Six legs

Three body parts

One set of antennae

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Wasp

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Bee

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Ant

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Ladybird

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Arthropods: Myriapods

Many legs and body segments

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Centipede

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Millipede

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