Phylum Arthropoda

General Characteristics Segmented body - head, thorax, abdomen Exoskeleton – Made of chitin (firm/leathery  tough/hard) Terrestrial have waxy covering that prevents water loss Outgrow the exoskeleton  molt (shedding of exoskeleton) Jointed appendages

General Characteristcs Classified by the number/structure of body segments/appendages, particularly their mouth parts Crustaceans – (aquatic) crabs, shrimp, lobster, crayfish, barnacles Chelicerates – horseshoe crabs, spiders, ticks, scorpions Uniramians – centipedes, millipedes, insects

Feeding Method Herbivores, carnivores, omnivores Variety in mouth parts allow variety in types of food consumed

Respiration Terrestrial Aquatic – feathery gills Tracheal tubes Spiracles – small openings on side of body where air enters/exits tracheal tubes Book lungs – layers of respiratory tissue stacked like pages in a book Aquatic – feathery gills

Circulation & Excretion Open circulatory system Excretion: Terrestrial Malpighian tubules – saclike organs that extract wastes Aquatic – diffusion

Response Brain Ganglia – help control movement Sense organs – eyes & taste receptors

Movement Have muscles (individual cells) – pull against exoskeleton which generates movement

Reproduction Terrestrial – internal fertilization Aquatic – internal or external

Incomplete Metamorphosis Complete Metamorphosis Life Cycles Adult Adult Eggs Eggs Incomplete Metamorphosis Complete Metamorphosis Larva Adult Nymph Nymph Immature Larva Nymph Adult Pupa