Phylum Arthropoda
General Information Phylum: Arthropoda Examples: Insects Spiders Crustaceans Centipedes Millipedes Scorpions
Characteristics 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 Complete digestive tract Feeding Patterns: all types Herbivores Carnivores Filter feeders Predators
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/16cm05/1116/16anim5.htm 11/14/07