u04 invertebrates

Essential Natural Science 1Unit 4

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Essential Natural Science 1Unit 4

Contents

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Invertebrates

Porifera and Cnidaria

PoriferaCnidaria

Platyhelminthes

Characteristics

Molluscs

CharacteristicsClassification

Arthropods

CharacteristicsClassificationOrders of insectsInsect mouthsMetamorphosis

Echinoderms

CharacteristicsClassification

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Annelids

Characteristics

Nematodes

Characteristics

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What are porifera like?

What are cnidaria like?

How are molluscs classified?

What are molluscs like?

What are arthropods like?

How are arthropods classified?

What are insect mouths like?

Metamorphosis of the monarch butterfly

What are echinoderms like?

How are echinoderms classified?

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What are Platyhelminthes like?

LinksInteractive activity: What do you know about invertebrates?

Animation: Arthropods

What are Annelids like?

What are Nematodes like?

Orders of insects

Essential Natural Science 1Unit 4

What are porifera like?

Sponges

osculum

channelsatrium cavity

Porifera have no organs.

water + nutrients

water

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pores

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• radial symmetry

• soft body

• tentacles

• gastrovascular cavity

• carnivorous

What are cnidaria like?

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What are cnidaria like?

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• radial symmetry

• soft body

• tentacles

• gastrovascular cavity

• carnivorous

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jellyfish

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What are platyhelminthes like?

Platyhelminthes (flatworms)

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• flat bodies• divided into rings• hermaphrodites

Taenia tapeworm (parasite)

soft body

bilateral symmetry

no skeleton

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What are nematodes like?

Nematodes (roundworms)

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soft body

bilateral symmetry

no skeleton

Pinworm

• cylindrical bodies

• no segments

• no respiratory system

• examples: trichina worms, pinworms

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What are annelids like?

Annelids (segmented worms)

Earthworm

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• cylindrical bodies

• divided into segments

• some are hermaphrodites

soft body

bilateral symmetry

no skeleton

segments

clitellum

head

body wall

digestive tube

setae (hairs)

coelom

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What are molluscs like?

• bilateral symmetry• soft body• carnivores and herbivores• lungs (terrestrial molluscs)• gills (aquatic molluscs)• metamorphosis

valves

head

foot

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visceral mass

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What are molluscs like?

shell

valves

stomach

lung

eyes

mouth

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visceral mass

• bilateral symmetry• soft body• carnivores and herbivores• lungs (terrestrial molluscs)• gills (aquatic molluscs)• metamorphosis

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What are molluscs like?

radula

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shell

valves

stomach

lung

eyes

visceral mass mouth

• bilateral symmetry• soft body• carnivores and herbivores• lungs (terrestrial molluscs)• gills (aquatic molluscs)• metamorphosis

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How are molluscs classified?

snail

slug

limpet

Cephalopods

Bivalves

octopus

Gastropods

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nautilus cuttlefish

scallop

mussel

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Animation: Arthropods

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• bilateral symmetry• exoskeleton• feeding habits vary• trachea (terrestrial arthropods)• gills (aquatic arthropods)• moulting and metamorphosis

What are arthropods like?

abdomen

thoraxhead

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Wasp

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• bilateral symmetry• exoskeleton• feeding habits vary• trachea (terrestrial arthropods)• gills (aquatic arthropods)• moulting and metamorphosis

What are arthropods like?

ocelluscompound eye

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antenna

wings

legs

mouth parts

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• bilateral symmetry• exoskeleton• feeding habits vary• trachea (terrestrial arthropods)• gills (aquatic arthropods)• moulting and metamorphosis

What are arthropods like?

cephalothorax

chelicerae pedipalp

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abdomen

Spider

legs

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Crustaceans

How are arthropods classified?

Myriapods

Insects

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Arachnids

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Orders of insects

Hymenoptera

Dermaptera

Lepidoptera

Diptera

Orthoptera

Coleoptera

Hemiptera

Odonata Siphonaptera

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What are insect mouths like?

Ants have mouthsfor chewing.

Bees have mouthsfor chewing and sucking.

Butterflies have mouthsfor sucking.

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Mosquitoes have mouths for piercing and sucking.

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Ants have mouthsfor chewing.

What are insect mouths like? GO BACK

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Bees have mouthsfor chewing and sucking.

Butterflies have mouthsfor sucking.

Mosquitoes have mouths for piercing and sucking.

Essential Natural Science 1Unit 4

Butterflies have mouthsfor sucking.

What are insect mouths like? GO BACK

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Ants have mouthsfor chewing.

Bees have mouthsfor chewing and sucking.

Mosquitoes have mouths for piercing and sucking.

Essential Natural Science 1Unit 4

Ants have mouthsfor chewing.

Bees have mouthsfor chewing and sucking.

Butterflies have mouthsfor sucking.

Mosquitoes have mouths for piercing and sucking.

What are insect mouths like? GO BACK

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Essential Natural Science 1Unit 4

Ants have mouthsfor chewing.

Bees have mouthsfor chewing and sucking.

Butterflies have mouthsfor sucking.

Mosquitoes have mouths for piercing and sucking.

What are insect mouths like? GO BACK

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Essential Natural Science 1Unit 4

The Metamorphosis of a Monarch butterfly

SANTILLANA

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Essential Natural Science 1Unit 4

The metamorphosis of a Monarch butterfly

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What are echinoderms like?

• radial symmetry in adults• internal skeleton of plaques• carnivores• most breathe through skin• metamorphosis

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arms

ambulacral system

symmetrical planes

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ambulacral system

What are echinoderms like?

• radial symmetry in adults• internal skeleton of plaques• carnivores• most breathe through skin• metamorphosis

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arms

symmetrical planes ambulacral feet

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How are echinoderms classified?

Echinoidea Ophiuroidea

CrinoideaHolothuroideaStelleroidea

sea urchin ophiura

starfish sea cucumber

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sea lily

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Interactive activity: What do you know about invertebrates?

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The Shape of Life