1. ARTHROPODA

2. Subphyla Crustaceans- Class Malacostraca - shrimp, lobster, crab Chelicerates- Class Arachnida - spiders, mites, scorpions Myriapeds- centipedes, millipedes Hexapods- Class Insecta This phylum is the largest with over 1,000,000 species

3. Characteristics Exoskeleton, segmented body, jointed appendages “arthros” means joint, “podos” means foot or leg Bilateral symmetry Metamorphosis- larva, pupa, adult Molting

4. Anatomy Appendages can be wings, antennae, legs, mouthparts Exoskeleton – protects and helps prevent evaporation of water Open circulatory system Coelomates Ganglia – mass of nerves serves as brain

5. Anatomy Respiration occurs through lungs or exoskeleton if land organism. If lives in water, gills. Arthropods have full muscular and excretory systems. Body covering is exoskeleton

6. Feeding Every feeding type is represented in phylum arthropoda Scavengers, predators, herbivores, parasites, carnivores, omnivores,

7. Reproduction Almost all reproduce sexually Asexual- A few reproduce by parthenogenesis where an egg can develop into an adult with no sperm (ants, bees, wasps, and aphids)

8. Habitat Arthropods can be found in almost every habitat on Earth niche Biotic factors Abiotic factors

9. Adaptations Mouthparts: Butterfly tongue is long and sticky, an ant has a sharp mouth for cutting, a fly’s tongue is like a sponge Exoskeleton Camouflage

10. Crustaceans Shrimp, lobsters, and crabs 2-3 body sections 5 or more pairs of legs 2 pairs of antennae Most have gills metamorphosis

11. Arachnids Spiders, ticks, mites, and scorpions 2 body sections – head and abdomen 4 pairs of legs No antennae These are usually predators – some have venom

12. Centipedes and Millipedes 2 body sections- head and abdomen Many pairs of legs Centipedes – have 1 pair of legs per segment Millipedes- have 2 pairs of legs per segment Terrestrial habitat

13. Hexapods All insects 3 body sections- head, thorax, and abdomen 1 pair antennae 1-2 pairs of wings Airholes in exoskeleton called spiracles Metamorphosis Camouflage