Cnidarians phylum Cnidaria

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Cnidarians (phylum Cnidaria)
Hydra
Jellyfish
Sea anemone
Coral
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Cnidarians (cont.)

• Radial symmetry and only two types of tissue
• All members have a gastrovascular cavity with one
  opening
• All members have Cnidocytes
• Can have two distinct body forms polyp or medusa
  (some have both)

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Cnidarians (cont.)
Coiled thread
Tentacle
Trigger
Discharge of thread
Prey
Cnidocyte
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Flatworms (phylum Platyhelminthes)

• Bilateral symmetry and all three tissue types
• All members have a gastrovascular cavity with one
  opening
• No true body cavity
• Three major groups
• Free living
• Flukes
• Tapeworms

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Flatworms Free living
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Flatworms Free living (cont.)
Nerve cords
Gastrovascular cavity
Mouth
Eyespots
Bilateral symmetry
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Flatworms Flukes
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Flatworms Tapeworms
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Roundworms (phylum Nematoda)

• Bilateral symmetry and all three tissue types
• All members have a complete digestive tract
  (separate mouth and anus)
• Have a pseudocoelom

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Roundworms (cont.)
Caenorhabditis elegans (C. elegans)
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Roundworms (cont.)
Heartworm
Hookworm
Trichinella spiralis
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Molluscs (phylum Mollusca)

• Soft bodied, most with a protective shell
• Have a true coleom
• Have a true circulatory system
• Have separate sexes
• Three main body parts
• Foot
• Visceral mass
• Mantle

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Molluscs (cont.)
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Molluscs Gastropods
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Molluscs Bivalves
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Molluscs Cephalopods
Octopus
Nautilus
Squid
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Segmented Worms (phylum Annelida)

• Segmented bodies
• Identical, repeated parts
• Closed circulatory system

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Segmented Worms (cont.)
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Segmented Worms Earthworms
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Segmented Worms Polychaetes
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Segmented Worms Leeches
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Arthropods (phylum Arthropoda)

• The most successful animal phylum
• Members have segmented bodies
• Hard exoskeleton
• Jointed appendages (highly specialized)

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Arthropods (cont.)
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Arthropods Chelicerates
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Arthropods Millipedes and Centipedes
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Arthropods Crustaceans
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Arthropods Insects

• Highly evolved and diversified
• Three body sections head, thorax, abdomen
• Three pairs of legs
• One or two pairs of wings
• Grouped into 26 orders

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Arthropods Insects (cont.)
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Insects Order Orthoptera
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Insects Order Odonata
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Insects Order Hemiptera
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Insects Order Coleoptera
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Insects Order Lepidoptera
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Insects Order Diptera
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Insects Order Hymenoptera