Phylum Arthropoda General Characteristics Segmented body head thorax

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 § 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 § Circulation § 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

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