Arthropods

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Chapter 31 Arthropods
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31-1 Features
Phylum Arthropoda
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• Includes insects, spiders, crayfish,
• Most successful animal group

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Arthropods are the most diverse Group of animals.
They live in the land, sea, and air!
There are approximately 900,000 species of
arthropods!
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They vary in size from about 8 micrometers to
about 12 feet across!
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Arthropods have 8 similar Characteristics
Jointed Appendages Segmentation Distinct Head
with Compound Eyes Exoskeleton Tracheae Open
Circulatory System Malpighian Tubes Wings
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Appendages are structures that Extend from the
arthropods Body wall.
They are basically jointed foot.
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• Antennae-

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Segmentation
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• Two sets of eyes
• Ocelli
• Compound

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Skeletal

• Exoskeleton
• Made of Chitin

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Growth and Development
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As arthropods grow they have to Create a new
exoskeleton, This is molting.
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Cicada Molting
Adult breaks through ecdysial ek-diz-ee-al
suture in the insect exoskeleton
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Respiratory System

• Varies
• Crabs and shrimp gills
• Horseshoe crab book gills

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• Insects use trachea - a network of fine tubes
• Spiracles - tiny holes where air enters

Pg 686
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Digestive System

• Tube-in-a-tube
• Malpighian Tubules
• Absorb nutrients and pass
• Them through anus
• All eating habits
• Locust herbivores
• Scorpion carnivore
• Ticks and fleas parasites

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• Mouth adapted to food source

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31-2 Spiders Arachnids
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Spiders have mouthparts called Chelicerae, or
fangs.
The second set of appendages are Pedipalps which
are used to Catch and handle prey.
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Only 2 species of spiders in the US Are
poisonous to humans, The Black Widow And The
Brown Recluse Both are here in Ohio.
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They build webs from spinnerets Located at the
end of the Abdomen.
Spiders wrap prey in their silk And suck out
their insides.
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Scorpions and mites are arachnids.
Fleas and ticks are mites.
Mites are the major cause of Indoor allergies in
humans.
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31-3 Insects
Subphylum Uniramia

• Centipedes, millipedes, and all insects
• One pair antennae two pair wings
• Appendages do not branch

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Most insects have chewing Mouthparts called
mandibles.
Most scientists agree that there Are more than
700,000 species.
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The insect life cycle is complex.
There are several molts and in the End there is a
dramatic Metamorphosis.
There are 2 kinds of metamorphosis, Complete and
incomplete.
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Complete (egg larvae pupaadult)
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• Incomplete

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• Tympanum (eardrum)

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31-4 Crustaceans
Subphylum Crustacea

• Crayfish lobster
• Two pair antennae
• 10 footed
• Pinchers used to obtain food
• Two body sections (head thorax are fused
  cephalothorax)

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THE END