u04 invertebrates
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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
Essential Natural Science 1Unit 4
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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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ENLARGE IMAGE
• radial symmetry
• soft body
• tentacles
• gastrovascular cavity
• carnivorous
What are cnidaria like?
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Essential Natural Science 1Unit 4
What are cnidaria like?
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• radial symmetry
• soft body
• tentacles
• gastrovascular cavity
• carnivorous
CoralsGO BACK
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
Essential Natural Science 1Unit 4
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
ENLARGE IMAGE
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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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Essential Natural Science 1Unit 4
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
ENLARGE IMAGE
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ENLARGE IMAGE
Wasp
Essential Natural Science 1Unit 4
• 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
ENLARGE IMAGE
Essential Natural Science 1Unit 4
• 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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ENLARGE IMAGE
abdomen
Spider
legs
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Crustaceans
How are arthropods classified?
Myriapods
Insects
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Arachnids
Essential Natural Science 1Unit 4
Orders of insects
Hymenoptera
Dermaptera
Lepidoptera
Diptera
Orthoptera
Coleoptera
Hemiptera
Odonata Siphonaptera
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Essential Natural Science 1Unit 4
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.
Essential Natural Science 1Unit 4
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
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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
Essential Natural Science 1Unit 4
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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