Jointed-legged invertebrates

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Presentation transcript:

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.