Transcript Animal kingdom-invertebrates

The Animal Kingdom
Simple Invertebrates
From Sponges to Echinoderms
Invertebrate
Animal without a backbone.
Major Phyla
Sponges (Porifera)
 Coelenterates
 Flatworms
 Roundworms
 Segmented Worms (Annelids)
 Mollusks
 Echinoderms
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Sponges (Porifera)
Bath Sponge
 Elephant’s Ear
Sponge
 Venus’s Flower
Basket
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Sponge Characteristics
Live in water
 Attach to objects
 Hollow body with opening at top
 Water flows through pores into body
 Cells with flagella filter food from
water
 Wastes flow out opening at top
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Coelenterates
Hydra
 Jellyfish
 Coral
 Sea Anemone
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Coelenterate Characteristics
Live in water
 Sometimes attached
 Sometimes floating
 Armlike tentacles with stinging cells catch
food & push through opening
 Waste flows out of same opening
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Flatworms
Planaria
 Tapeworm
 Fluke
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Flatworm Characteristics
Some Free-living
 Some parasites, live in and on other
organisms
 Definite head & tail end
 Food and wastes pass through same
opening
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Roundworms
Trichina
 Pinworm
 Hookworm
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Roundworm Characteristics
Some free-living
 Some Parasites
 Smooth body
 Food enters mouth
 Wastes leave body through anus at other
end of digestive system
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Segmented Worms (Annelids)
Earthworm
 Sandworm
 Leech
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Segmented Worm Characteristics
Body developed into ringlike segments
 Well developed digestive, circulatory, and
nervous systems
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Mollusks
Clam
 Scallop
 Snail
 Squid
 Octopus
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Mollusk Characteristics
Well-developed body systems
 Many have shells
 Move with muscular foot
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Echinoderms
Starfish
 Sea Urchin
 Sand Dollar
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Echinoderm Characteristics
Spines stick out from inside skeleton
 Move with tube feet
 Food & wastes pass through same opening
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Complex Invertebrates
The Arthropods
Arthropods
Means jointed legs
 Have bodies in 2 or more parts
 Body covered with a tough exoskeleton
 Exoskeleton splits & is skaken off as
animal grows – called molting
 New exoskeleton grows to take place
of the old one
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Classes of Arthropods
Insects
 Arachnids
 Crustaceans
 Chilopoda (centipedes)
 Diplopoda (millipedes)
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Insects
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Grasshopper
Ant
Mosquito
Termite
Butterfly
Bee
Moth
Housefly
Insect Characteristics
Three main body parts: head, thorax
(middle region), and abdomen (lower
region).
 Three pairs of legs
 One pair of feelers or antennae
 Most have wings
 Some are social - live together & divide
work
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Arachnids
Spider
 Mite
 Tick
 Scorpion
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Arachnid Characteristics
Two body parts: head & thorax-abdomen
 Four pairs of legs
 No antennae
 Spinnerets of spiders produce silk to make
webs for catching prey
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Crustaceans
Crab
 Lobster
 Shrimp
 Barnacle
 Water Flea
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Crustacean Characteristics
Two body parts: head & thorax-abdomen
 Five pairs of walking legs plus swimmerets
for swimming
 Two pairs of antennae
 Live in water
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Chilopoda (centipedes)
House Centipede
 Field Centipede
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Chilopoda Characteristics
Wormlike body made up of many
segments
 One pair of legs on each segment
 Claws on first segment give off poison that
paralyzes prey
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Diplopoda
Common Millipede
 Spotted-Snake
Millipede
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Diplopoda Characteristics
Wormlike body with many segments
 Two pairs of legs on each segment
 Roll up in a ball when disturbed
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