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Arthropods

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

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Arthropods

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  1. Arthropods Jointed-legged invertebrates

  2. Arthropod Characteristics • Chitinous exoskeleton • Paired-jointed appendages • Growth with ecdysis (molting) • Open circulatory system • Complete digestive tract

  3. Exoskeleton • Major reason for success! • Provides • Support • Protection • Prevention of dehydration • Sites for muscle attachment

  4. Metamorphosis • Change body form from immature (larval) stages to adult forms • Reduces competition between stages for • Food • Living space

  5. Taxonomy of Arthropods • 4 subphyla • Trilobitomorpha (all extinct) • Chelicerata • Crustacea • Uniramia

  6. Chelicerata • Horseshoe crabs • Spiders • Mites • Ticks • Scorpions

  7. Crustacea • Shrimp, lobsters, crayfish • Fairy shrimp, brine shrimp • Water fleas • Barnacles

  8. Uniramia • Class Diplopoda (millipedes) • Class Chilopoda (centipedes) • Class Hexapoda (insects)

  9. Nervous System • Johnston’s organs (hearing - on antennae) • Tympanic organs (hearing – on legs or body) • Compound eyes (facets – ommatidia – fused) • Simple eyes (ocelli)

  10. 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.

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