Phylum Arthropoda General Information Phylum Arthropoda Examples Insects

Phylum Arthropoda

General Information Phylum: Arthropoda Examples: Insects Spiders Crustaceans Centipedes Millipedes Scorpions

Characteristics 1. Body Structure a. Eucoelomate = fluid-filled body cavity, gut lined with peritoneum b. Segmentation (Metamerism) Tagmata = fused segments

Characteristics c. Jointed Appendages

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

Characteristics 2. Level of Organization = organ system 3. Symmetry = Bilateral

Characteristics 4. Feeding RComplete digestive tract RFeeding Patterns: all types ØHerbivores ØCarnivores ØFilter feeders ØPredators

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

5. Respiration a. Aquatic: Gills b. Terrestrial: Spiracles & Tracheae or Book Lungs

Grasshopper Respiratory System

Spider Respiration- book lungs

Respiration – Crustaceans Gills

6. Internal Transport Open Circulatory System

Spider Internal Transport (red) = Heart and blood vessels

Bibliography § Grasshopper Internal Transport www. entomology. umn. edu/cues/4015/morpology/ 11/14/07 § Spider Respiratory System homepage. ntlworld. com/spydawebb/anatomy. html 11/14/07 § Spider Anatomy kentsimmons. uwinnipeg. ca/16 cm 05/1116/16 anim 5. htm 11/14/07