Invertebrates_Edtech101
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INVERTEBRATES
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Invertebrates Animals without backbones
97% of all animal species
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Invertebrates
Phylum Molluska
Phylum Echinodermata
Phylum Platyhelminthes
Phylum Nematoda
Phylum Arthropoda
Phylum Cnidaria
Phylum Porifera
Phylum Annelida
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PHYLUM PORIFERA (Sponges)
• “Porifera” means pore – bearing• lacks true tissues & organs; incomplete
digestive system • has skeleton that supports & protects the
body; made up of “spicules”
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PHYLUM CNIDARIA
• Radially symmetric• digestive chambers with a single
opening, which serves as both mouth & anus
• Includes: hydras, jellyfish, corals and sea anemones
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2 body forms: polyp form and medusa form 1. polyp form - cylindrical; mouth & tentacles at the upper end 2. medusa form – shaped like an upside-down bowl; mouth & tentacles facing downwardhas tentacles with stinging cells called “cnidocytes” that paralyzes their preys
PHYLUM CNIDARIA
Jellyfish -medusa
Coral - polyp
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Hydra
JellyfishSea anemones
Coral
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PHYLUM PLATYHELMINTHES (Flatworms)
• with flattened bodies; bilateral symmetry• lacks body cavity• most flatworms are parasites
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• 3 major groups: flukes, planaria & tapeworms 1. Flukes – parasites that absorb the
nutrients from the body of a host harming it; causes a disease called schistosomiasis
2. Planarians – non-parasitic, lives in moist environments & free-living
3. Tapeworms – long ribbon-like flatworm; can infect humans through eating undercooked meat of an infected cow or pig
PHYLUM PLATYHELMINTHES (Flatworms)
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Planaria
Fluke
Tapeworm
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PHYLUM NEMATODA (Roundworms)
• has cylindrical bodies tapered at both ends & covered by a tough cuticle
• includes parasitic types: trichina, filaria, pinworms, & hookworms
• Many are introduced through poorly cooked pork or walking barefoot in contaminated areas.
• Some diseases caused by roundworms: elephantiasis, trichinosis.
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Pinworm
TrichinaHookworms
Filaria
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PHYLUM ANNELIDA (Segmented Worms)
• With segmented bodies which has a ringed appearance
• Includes: earthworms & leeches
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PHYLUM MOLLUSKA (Mollusks)
• Second largest animal phylum• Includes: oyster, clams, snails, squids
and octopuses• Some are sources of food for
humans.
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Oysters
Clams
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Snail
Squid
Octopus
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PHYLUM ECHINODERMATA (Spiny-skinned)
• Includes: starfish, sea urchin and sea cucumbers• Has internal skeleton for support &
protection
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Starfishes
Sea cucumber
Sea urchins
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PHYLUM ARTHROPODA (Arthropods)
• Largest group in the animal kingdom• Has exoskeleton; segmented body & joint
appendages• Divided into 4 groups: 1. Crustaceans – lobsters, shrimps, crabs & crayfish 2. Insects – ants, mosquitoes, bees, wasps, bugs & flies 3. Arachnids – spiders, mites & scorpions 4. Myriapods – centipedes & millipedes
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LobsterShrimp
Crayfish
Hermit crab Crabs
Crustaceans
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Name the insects!
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Spiders
Scorpion
Ticks
Mites
Arachnids
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Myriapods
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The End