Michelle A' OMalley

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Invertebrates

• By
• Michelle A. OMalley
• League Academy of Communication Arts

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Echinoderms
SPONGE
What do you know about invertebrates? Do you know
the different parts of a crawfish?
What do you know about Invertebrates? Do you
know the parts of a starfish?
What do you know about invertebrates? Do you know
the parts of an earthworm?
Invertebrates
SEGMENTED WORMS
ARTHROPODS
GIANT CLAIM MOLLUSK
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Standard 6-3.1 Invertebrates
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• Invertebrates are animals without backbones
• There are more invertebrates than there are
  vertebrates
• 90 of all animals are invertebrates
• The largest group of invertebrates are the
  arthropods
• Invertebrates consist of the following groups
  sponges, segmented worms, echinoderms,
  arthropods, and mollusks

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Standard 6-3.1 Invertebrates - Sponges
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• Sponges are very simple animals that have many
  pores (holes) through which water flows.
• Water moves into a central cavity and out through
  a hole in the top.
• Sponges obtain their food and eliminate wastes
  through this passage of water.
• Sponges live in fresh or salt water.

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Standard 6-3.1 Invertebrates Segmented Worms
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• Segmented worms have long tube-like bodies that
  are divided into segments.
• Segmented worms are the simplest organisms with a
  true nervous system.
• Segmented worms have a long digestive tube that
  runs down the length of the worms inside body.
• Examples of segmented worms are earthworms and
  leeches.

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Standard 6-3.1 Invertebrates Echinoderms
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• Echinoderms have similar parts (arms) that extend
  from the middle body outwards.
• Echinoderms have tube feet and spines
• Echinoderm examples are starfish, brittle stars,
  sea cucumbers, or sea urchins.

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Standard 6-3.1 Invertebrates Arthropods
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• Arthropods have jointed legs.
• Arthropods live on land and in water.
• Arthropods have hard outer coverings called
  exoskeletons.
• Arthropods have segmented bodies.
• Some arthropods have wings.
• Examples of arthropods are insects, spiders, and
  crustaceans.

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Standard 6-3.1 Invertebrates Mollusks
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• Mollusks have soft bodies.
• Most Mollusks have a thick muscular foot for
  movement or to open and close their shells.
• Mollusks live in salt or fresh water or on land.
• Some mollusks have shells
• Examples of mollusks are snails, claims, and
  octopuses.

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Crawfish Anatomy
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Earthworm Anatomy
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All Earthworm pictures from http//sps.k12.ar.u
s/massengale/earthworm_dissection.htm
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Works Cited
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• Science Explorer Animals by Jan Jenner, Ph.D.,
  Prentice-Hall, Inc., Upper Saddle River, NJ 2000.
• Graphics from Microsoft Office and cited
  information under each graphic
• Greenville County Schools Science Curriculum
  Support Guide