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ARTHROPODS: Jointed-Legged Invertebrates

ARTHROPODS: Jointed-Legged Invertebrates. TSW describe the characteristics of arthropods that inhabit the marine environment. CHARACTERISTICS. Chitinous exoskeleton Paired, jointed appendages Growth with ecdysis (molting) Open circulatory system Complete digestive tract. EXOSKELETON.

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ARTHROPODS: Jointed-Legged Invertebrates

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  1. ARTHROPODS: Jointed-Legged Invertebrates TSW describe the characteristics of arthropods that inhabit the marine environment

  2. 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 • 4 Subphyla • Trilobitomorpha (ALL extinct) • Chelicerata • Crustacea • Uniramia

  6. CHELICERATA • Mouth parts called Chelicerae • Two body sections (cephalothorax & abdomen) • Most have 4 pairs of walking legs • EX. Horseshoe crabs

  7. VENTRAL VIEW

  8. DORSAL VIEW

  9. CRUSTACEA • 2 pairs of antennae • 2 or 3 body sections • Chewing mouthparts called Mandibles • EX. Shrimp, lobsters, crayfish, water fleas, fairy shrimp, brine shrimp, & barnacles

  10. NERVOUS SYSTEM • Johnstons Organs: Hearing, on antennae • Tympanic Organs: Hearing, on legs & body • Compound Eyes: Facets, ommatidia (fused) • Simple Eyes: Ocelli

  11. Economic Impact • Food • Symbionts…what does this mean? • Recycling & Fouling

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