Arthropoda
- Most diverse phylum
- Means "joint foot"
- Invertebrate
- Includes
- Chelicerates- horseshoe crabs and arachnids
- Millipedes and centipedes
- Crustaceans- have head, body, thorax body plan
- Insects- undergo metamorphosis, and have a head, body, thorax body plan
- Protosome- during embryonic development the first opening, blastopore, forms the mouth
- Coelomates- has true coelom- a fluid filled cavity in the body that contains the digestive tract and other organs.
- Segmented body
- Exosketelon- made of chitin, molts to grow, protects the organism
- Malpighian Tubules- primitive kidney
- Trachea- air ducts for gas exchange