Transcript Phylum Arthropoda

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
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