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Arthropoda and Echinodermata

Arthropoda and Echinodermata. Arthropods – General Characteristics. Most diverse group Insects, Crustaceans, Millipedes, Centipedes, Arachnids (Spiders, scorpions) Coelomate Bilaterally symmetrical Exoskeleton, jointed appendages, segmented body Open circulatory system.

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Arthropoda and Echinodermata

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  1. Arthropoda and Echinodermata

  2. Arthropods – General Characteristics • Most diverse group • Insects, Crustaceans, Millipedes, Centipedes, Arachnids (Spiders, scorpions) • Coelomate • Bilaterally symmetrical • Exoskeleton, jointed appendages, segmented body • Open circulatory system

  3. Arthropoda – Four Subphyla • Trilobita (extinct) • Chelicerata – horseshoe crabs, spiders, scorpions, mites, ticks • Crustacea - crabs, crayfish, pill bugs, lobster, shrimp, barnacles • Uniramia – Centipedes, millipedes, insects

  4. Subphylum Chelicerata Class Arachnida: Spiders Top: Horseshoe crab. Left: Scorpion. Bottom: Dust mite Tick

  5. Subphylum Crustacea Barnacles Crabs, lobsters and shrimp! Roly-polys. Aka Pillbugs

  6. Subphylum Uniramia, Class Chilopoda & Class Diplopoda – Centipedes and Millipedes

  7. Subphylum Uniramia, Class Insecta • Put together, outweigh all terrestrial animals (Over 800,000 species!) • One ton of ants and termites for every human on earth • Six legs • Jump • Walk • Wings • Single pair of antennae

  8. Class Insecta Butterfly Emerging

  9. Echinodermata (“spiny skin”) – General Characteristics • Sea stars, sea urchins, sand dollars, sea cucumbers, sea lilies, brittle stars • 5-part radial symmetry • Water vascular system • Tube Feet Sea star moving • 5 classes in the phylum

  10. Asteroidea - Seastars

  11. Echinoidea – Sea urchins and sand dollars

  12. Sea cucumbers, feather stars, brittle stars Class Ophiuroidea: Brittle star (above), Basket star (below) Class Holothuroidea – Sea cucumbers Class Crinoidea: feather star (left), sea lily (right)

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