Invertebrate

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Invertebrate Zoology 8 Major Phyla
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Phylum Platyhelminthes Class Turbellaria
Flatworms

• 3 Tissue Layers (ecto, meso, and endoderm)
• No Body Cavity (coelom) FLAT!!
• Dead End Digestive System Only one opening!
• Hermaphrodite

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Famous Flatworm Planaria
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Phylum Platyhelminthes Parasitic
FlatwormsTape Worm Liver Fluke

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Phylum Nematoda Roundworms

• Nema thread
• 3 Tissues layers plus a body cavity
• One Way Digestive System 2 Openings!
• Separate Sexes
• Ubiquitous!!!

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Round round get around, they get around
Ascaris Lumbricoides Human intestinal parasite
Nematode inside a tomato root.
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Phylum Annelida Segmented Worms (Earth Worms,
Marine/Tube Worms, Leeches

• 3 Tissue Layers
• True Body Cavity Coelom
• Hermaphrodites
• Vital to Ecosystems
• First animal with Circulatory System
• 1 Way Digestive System

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Structure of an Earthworm
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Marine Worms Leeches
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Phylum Mollusca

• Means soft bodied
• Over 80,000 known species, most have shells to
  protect it
• First animals with respiratory system gills!!!

Gastropods Snails/slugs Bivalves
Clams/Oysters Cephalopods
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Other Gastropods
Slugs
Conches
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Structure of a clam
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Other Bivalves
Flame Scallop
Oyster
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Octupus Intelligence/Cephalopods

• Octopuses have the most complex brain of any
  invertebrate.
• They have long term and short term memory like
  vertebrates.
• They can learn to solve problems by trial and
  error and by experience.
• Once they solve a problem they can remember the
  solution and solve it repeatedly.
• Fast predators closed circulatory system

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Other Cephalopods
Cuttlefish
Nautilus
Squid
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Giant Squid

• Have been found dead
• or dying in oceans
• across the world.
• Scientists do not know
• exactly where they live.
• Sperm whales are known
• to eat them and fight with
• them.
• Largest invertebrate -
• 60 feet or more.