Phylum Arthropoda

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Phylum Arthropoda
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General Information

• Phylum Arthropoda
• Examples
• Insects
• Spiders
• Crustaceans
• Centipedes
• Millipedes
• Scorpions

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Characteristics

• Body Structure
• a. Eucoelomate
• fluid-filled body cavity,
• gut lined with peritoneum
• b. Segmentation (Metamerism)
• Tagmata fused segments

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Characteristics

• c. Jointed Appendages

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Characteristics

• d. Exoskeleton with chitin
• Advantages
• 1) Protection
• 2) Place for muscle attachment
• Disadvantages
• 1) Have to molt to get bigger
• 2)During ecdysis (molting)
• cannot move, very vulnerable to predation

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Characteristics

• 2. Level of Organization
• organ system
• 3. Symmetry
• Bilateral

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Characteristics

• 4. Feeding
• Complete digestive tract
• Feeding Patterns all types
• Herbivores
• Carnivores
• Filter feeders
• Predators

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4. Feeding

• Specialized appendages
• E.g.
• Mouth parts (mandibles, probosci, etc.)
• Legs, pincers, chelicerae, pedipalps
• Antennae

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5. Respiration

• a. Aquatic
• Gills
• b. Terrestrial Spiracles Tracheae
• or Book Lungs

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Grasshopper Respiratory System
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Spider Respiration- book lungs
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Respiration CrustaceansGills
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6. Internal Transport

• Open Circulatory System

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Spider Internal Transport
(red) Heart and blood vessels
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Bibliography

• Grasshopper Internal Transport www.entomology.umn.
  edu/cues/4015/morpology/ 11/14/07
• Spider Respiratory System homepage.ntlworld.com/sp
  ydawebb/anatomy.html 11/14/07
• Spider Anatomy kentsimmons.uwinnipeg.ca/16cm05/111
  6/16anim5.htm 11/14/07