Jointed-legged invertebrates Arthropods Jointed-legged invertebrates
Arthropod Characteristics Chitinous exoskeleton Paired-jointed appendages Growth with ecdysis (molting) Open circulatory system Complete digestive tract
Exoskeleton Major reason for success! Provides Support Protection Prevention of dehydration Sites for muscle attachment
Metamorphosis Change body form from immature (larval) stages to adult forms Reduces competition between stages for Food Living space
Taxonomy of Arthropods 4 subphyla Trilobitomorpha (all extinct) Chelicerata Crustacea Uniramia
Chelicerata Horseshoe crabs Spiders Mites Ticks Scorpions
Crustacea Shrimp, lobsters, crayfish Fairy shrimp, brine shrimp Water fleas Barnacles
Uniramia Class Diplopoda (millipedes) Class Chilopoda (centipedes) Class Hexapoda (insects)
Nervous System Johnston’s organs (hearing - on antennae) Tympanic organs (hearing – on legs or body) Compound eyes (facets – ommatidia – fused) Simple eyes (ocelli)
Economic Impact of Arthropods Name one effect each major group has on mankind (good or bad). For insects, list 4 good things that they do and 4 bad things that they are responsible for.