invertebrates what is an invertebrate? an animal that has no backbone most animals in the world are...
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Invertebrates
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What is an invertebrate?
• An animal that has no backbone
• Most animals in the world are invertebrates
• Most invertebrates are smaller than vertebrates.
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V erteb ra tes(H a v e b a ck b on e)
In v erteb ra tes(N o b a ck b on e)
A n im a lK in gd om
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P or i fe ra
C n id ar ia
W orm s(An ne lid s)
M o llu sk
E ch in od erm s
A r th rop ods
In ve rte b ra tes
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Porifera• Aquatic• Multicellular• Tiny pores all over
their bodies• Example:
– Sponge
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Cnidaria• Aquatic• Soft-bodied• Stinging tentacles• Examples:
– Hydras– Jellyfish– Sea Anemones– Coral
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Hydra
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Jellyfish
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Sea Anemone
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Coral
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Worms
• No shells• No legs• No eyes• Examples:
– Earthworms
– Tapeworms
– Sandworms
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Mollusks
• May have a hard outer shell, but not always
• Examples:– Snails
– Clams
– Squid
– Octopus
– slugs
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Snail
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Clams
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Squid
Squid
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Octopus
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Echinoderms
• Aquatic• Spiny-skinned• 5-part symmetrical
body• Examples:
– Starfish– Sea Urchin– Sand Dollar– Sea Cucumber
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Starfish
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Sea Urchin
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Sand Dollar
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Sea Cucumber
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Arthropods
• Jointed legs• 2 or more body parts
– Head– Thorax– Abdomen
• Often have exoskeleton
• 850,000 species we know of so far!
I n sects
S p id er s
M i tes
C r a bs
S cor p ion s
A r th r opods
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Arachnids• Two body parts:• Cephalothorax• Abdomen• 4 pairs of legs• Can regrow legs• 8 eyes• Poison glands in jaw• Spinnerets on end of
abdomen for webs
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Don’t get ticked!
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…or stung by a scorpion!
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Crustaceans
• Head• Thorax• Abdomen• 3 pairs of legs• Swimmerets
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Mmmm…lobster
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Don’t be crabby!
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Hey Shrimp!Hey Shrimp!!
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Insects• Head• Thorax• Abdomen• 6 legs• Compound Eyes
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Millipedes
• Two pairs of legs per segment
• Rounded body• Not poisonous
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Centipedes
• One pair of legs per segment
• Flat body• Poison claws behind
head• Paralyze prey
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Aren’t invertebrates
fun?