Phylum: Arthropoda Insects, lobster, shrimp, millipedes, centipedes, spiders, ticks

Arthropods: Characteristics Exoskeleton—made of chitin, periodically shed Jointed appendages Malpighian tubules for excretion Open circulatory system Most have 3 body segments (head, thorax, and abdomen)

Five Classes  Insecta (pg 726) Simple eyes—see light and dark Compound eyes—see many images

Undergo metamorphosis Complete Egg, larva (caterpillar), pupa (cocoon), adult…butterfly Incomplete Egg, nymph (immature adult), adult

Reproduce in huge numbers Have spiracles—breathing tubes (like straws) in the abdomen Pg. 557

2. Crustacean (Page720) Lobster, shrimp Lose exoskeleton as they grow 2 segments..head/thorax = cephalothorax which is covered by a hard cover called a Carapace

Green glands---excrete waste from below the eyes. Movable eye stalks Teeth are in the stomach Swimmerets under abdomen..mama carries eggs Tail -- telson and uropods..used for rapid backward movement

Front claws—chelipeds 10 pairs of gills Antennae and antenule—sense structures Open circulatory system Swim backwards

3. Diplopoda Millipedes Two pairs of walking legs per segment, move slow herbivores

4. Chilopoda Centipedes One pair of legs per segment Carnivores, pair of fanglike claws

5. Arachnida (Page 722) Spiders, scorpions, ticks, and mites 2 segments, head and thorax fused (cephalothorax) and abdomen Chelicerae—pair of appendages modified into either pinchers or fangs

8 legs Breathe using book lungs (folds of tissue) Pedipalps—pair of appendages used to hold food Spinnerets—paired structures, release silk for web building