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The body structure shows bilateral symmetry.

They are triploblastic.

They can be found in all types of habitats – land, water and soil.

They have jointed limbs.

The body is segmented into three regions – Head, Thorax and Abdomen.

The Sub Phylum in arthropoda

Crustacea

Myriapod

Arachnida

Insecta

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Poriferans are commonly called sponges.

Most of them are marine while a few are fresh water forms.

Examples

Sponges

Demo sponge

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These are exclusively marine animals
The larval forms show bilateral symmetry and adult forms show radial symmetry
Examples:
Starfish
Sea Cucumber
Sea Urchin

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Primitive Body
Shape and Body Structure
Parasitism & Crytobiosis.
Examples
Round Worms

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Habitat: They are mostly marine
Body Form: The body of molluscs is unsegmented with a distinct head, muscular foot and visceral hump
Examples
Squid
Octopus
Cuttle

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Stinging cells.

Two stages in life cycle (polyp & medusa)

Blind sack gut.

Radial symmetry.

Examples

Sea anemones

True Jellyfishes

Box Jellyfishes

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Almost all adult arachnids have eight legs.
Arachnids don't have jaws.
Examples
Ticks
Mites

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They are the largest class of Arthropoda
Insects have segment bodies, jointed legs, and external skeletons
Examples
Paper Wasp
European Hornet

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A hard exoskeleton made of calcium - no internal skeleton.

The head has two compound eyes, two pairs of antennae, and three pairs of mouthparts.

A pair of green glands excrete wastes near the base of antennae.

The abdominal segments have swimmerets which they use for swimming

Examples
Shrimp
Crab
K