Phylum Arthropoda
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Common name
Arthropods Jointed feet
diversity
Composes 85% of all animal diversity
Symmetry
Bilateral Triploblastic
Organ system
Complete digestive system Open circulatory system
Respiratory system
Gills Book lungs Spiracles and trachea
Exoskeleton
Chiton and protein Ecdysis
Segmentation
Tagmata 1) head, thorax, abdomen 2) cephalothorax, abdomen 3) head- trunk
Ecological importance
Pollinate crops Voracious herbivores Disease vectors Valuable food
Subphylum cheliecerata
Marine, freshwater, and Terrestrial Dioecious Structure: cephalothorax and abdomen Chelicerae: 1st pair venomous fangs Pedipalps: 2nd pair appendages Ex. Spider, scorpion, mite, tick
Subphylum myriapoda
Terrestrial Venom claws Predators Centipedes and millipedes
Subphyla crustacea
Crustaceans Freshwater and marine Most dioecious Structure: 2 antenna pairs, mandibles, biramous appendages, cephalothorax-abdomen, carapace
Subphylum hexapoda
Freshwater, terrestrial, few marine Metamorphosis- 1st flight Structures: 3 pairs of legs 2 pairs of wings Compound eye
Trilobita
Trilobites Extinct subphyla Compose many arthropod fossils