INVERTEBRATES The Silent Majority. Did you know? At least 95% of all animals on this planet are...
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INVERTEBRATESINVERTEBRATES
The Silent MajorityThe Silent Majority
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Did you know?Did you know?
At least 95% of all animals on this planet At least 95% of all animals on this planet are invertebratesare invertebrates
The weight of all earthworms, insects and The weight of all earthworms, insects and spiders is 55 times MORE that that of spiders is 55 times MORE that that of humans!humans!
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SpongesSponges
Scientists used to Scientists used to mistake them for plants.mistake them for plants.
The simplest The simplest invertebrate.invertebrate.
No symmetryNo symmetry Made up of two cell Made up of two cell
layers with a jelly-like layers with a jelly-like substance in-between.substance in-between.
Hollow and no bones.Hollow and no bones.
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Scuba SpongeScuba Sponge
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Vase SpongeVase Sponge
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Yellow Finger SpongeYellow Finger Sponge
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Dried SpongesDried Sponges
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CnidariaCnidaria
Simple animals with a Simple animals with a sting.sting.
Australina sea wasp Australina sea wasp has enough venom to has enough venom to kill 60 people!kill 60 people!
Like the sponge, it Like the sponge, it has 2 cell layers but is has 2 cell layers but is more complex. more complex.
Has a mouth and …Has a mouth and …
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Australia Sea Wasp aka Box Australia Sea Wasp aka Box JellyfishJellyfish
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Sea AnemoneSea Anemone
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Tealia AnemoneTealia Anemone
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CoralCoral
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Flat WormsFlat Worms
The simplest wormsThe simplest worms Flat, ribbon-like Flat, ribbon-like
bodies with a head bodies with a head and tailand tail
No digestive system – No digestive system – some absorb food, some absorb food, others eat food and others eat food and pass waste through pass waste through their mouththeir mouth
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Marine WormMarine Worm
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New Zealand Flat WormNew Zealand Flat Worm
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PlanarianPlanarian
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TapewormTapeworm
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Round WormsRound Worms
Slender, rounded bodies with pointed endsSlender, rounded bodies with pointed ends About 2,500 species are parasitesAbout 2,500 species are parasites One-way digestive system (food comes in One-way digestive system (food comes in
through one opening, and out another) through one opening, and out another)
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The follow pictures may gross you out! If The follow pictures may gross you out! If you have a weak stomach, you should you have a weak stomach, you should probably leave the room…probably leave the room…
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Ew!Ew!
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Double Ew!Double Ew!
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HookwormHookworm
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Segmented WormsSegmented Worms
The most complex The most complex wormworm
Blood travels through Blood travels through vesselsvessels
3-layer body with 3-layer body with bilateral symmetrybilateral symmetry
One-way digestive One-way digestive systemsystem
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EarthwormEarthworm
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LeechLeech
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MollusksMollusks
Soft bodied invertebratesSoft bodied invertebrates Some live on land, others in waterSome live on land, others in water Most have bilateral symmetry and many organ systemsMost have bilateral symmetry and many organ systems Most have either one shell, two shells, or an inner shellMost have either one shell, two shells, or an inner shell
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Slugs and SnailsSlugs and Snails
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ClamsClams
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MusselsMussels
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NautilusNautilus
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ScallopsScallops
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OystersOysters
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OctopusOctopus
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SquidSquid
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EchinodermsEchinoderms
Spiny-skinned Spiny-skinned animals – most with a animals – most with a star designstar design
Endoskeletons!Endoskeletons! Many move and grab Many move and grab
things with tiny tube things with tiny tube feetfeet
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Sand DollarsSand Dollars
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Sea StarsSea Stars
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Sea CucumberSea Cucumber
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Sea UrchinSea Urchin
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ArthropodsArthropods
The largest invertebrate phylumThe largest invertebrate phylum Jointed legs, body divided into sectionsJointed legs, body divided into sections Some breathe with gills, others with an Some breathe with gills, others with an
open-tube breathing systemopen-tube breathing system Exoskeleton! Made of chitin!Exoskeleton! Made of chitin! We will focus on four major arthropod We will focus on four major arthropod
classesclasses
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Arthropod class: ArachnidsArthropod class: Arachnids No antennaeNo antennae Four pairs of legs, two Four pairs of legs, two
section body, up to 8 section body, up to 8 eyeseyes
Lives in a variety of Lives in a variety of habitatshabitats
Most are hunters that Most are hunters that eat insectseat insects
Many are poisonous!Many are poisonous!
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MitesMites
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TicksTicks
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Daddy-longlegsDaddy-longlegs
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SpidersSpiders
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ScorpionsScorpions
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Everyone’s Favorite ArachnidEveryone’s Favorite Arachnid
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Arthropod Class: Arthropod Class: CrustaceansCrustaceans
Jaw-like structures for Jaw-like structures for crushing food and crushing food and chewingchewing
Two pairs of antennae for Two pairs of antennae for sensingsensing
10 or fewer legs, 10 or fewer legs, including clawsincluding claws
Sectioned bodySectioned body Some live on land and Some live on land and
others in waterothers in water Eat dead animal remains, Eat dead animal remains,
seaweed, other leftoversseaweed, other leftovers
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CrabsCrabs
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LobstersLobsters
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Shrimp Shrimp
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Barnacles Barnacles
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Crayfish Crayfish
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Sow BugsSow Bugs
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Arthropod Class:Arthropod Class:Centipedes and MillipedesCentipedes and Millipedes
Their names can confuse you!Their names can confuse you! Both have long, thin, segmented bodiesBoth have long, thin, segmented bodies Centipedes have one pair of legs per Centipedes have one pair of legs per
segments, millipedes have two.segments, millipedes have two. Millipedes’ legs move in a wave-like Millipedes’ legs move in a wave-like
motionmotion
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CentipedesCentipedes
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MillipedesMillipedes
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Arthropod Class:Arthropod Class:InsectsInsects
Head has one pair of Head has one pair of antennaeantennae
Three pairs of legs; one Three pairs of legs; one or two pairs of wingsor two pairs of wings
3 body sections: head, 3 body sections: head, thorax, abdomenthorax, abdomen
Eats other animals and Eats other animals and plantsplants
Special tube system for Special tube system for breathingbreathing
Compound eyes made of Compound eyes made of hundreds of lenseshundreds of lenses
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BeetlesBeetles
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FliesFlies
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Bees Bees
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AntsAnts
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MosquitoMosquito
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Butterflies Butterflies
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Dragonflies Dragonflies
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Fleas Fleas
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TermitesTermites
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CockroachCockroach
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The Coral ReefThe Coral Reef
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Another Coral ReefAnother Coral Reef