Phylum Arthropoda

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Phylum Arthropoda
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What animals are arthropods?
Trilobites (Extinct!)

• Part of Paleozoic
• marine ecosystems
• Bodies divided into
• 3 long vertical lobes
• with many legs
• Most were
• bottom feeders.

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Crustaceans
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• Found in oceans, freshwater streams and
• some on land.
• Diverse group range from huge king
• crab to microscopic copepods and oyster-like
• barnacles

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Chelicerates
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• Share a set of specialized dagger like mouth
• parts used for tearing their food.

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Insects
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• 80 of all known species
• Most are terrestrial
• Have 6 legs

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Myriapods Centipedes and Millipedes

• Long bodies
• Many pairs of legs

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Shongololo giant millipede found in Southern
Africa From Zulu and Xhosa means to roll up
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Characteristics

• Exoskeleton made of chitin
• Jointed appendages can have 6, 8, 10 or
• even 100s. Used for walking, swimming,
• sensing, manupilating food, chewing

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• Charactertics (continue..)
• Segmentation

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• Arthropods must shed exoskeleton molting
• Process has steps
• New layer of cuticle secreted underneath
• exoskeleton.
• Enzymes are secreted to digest and weaken
• old cuticle.
• New exoskeleton is filled with fluid, takes
• time to harden.

http//shapeoflife.org/video/behavior/arthropods-b
lue-crab-molting