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Kingdom Animalia Phylum Arthropoda

Kingdom Animalia Phylum Arthropoda. Arthropods. “joint-foot” Have jointed appendages modified for different functions Largest phylum of animals. Exoskeleton. Hard , protective exterior skeleton Made of protein & chitin Flexible for joint movement

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Kingdom Animalia Phylum Arthropoda

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  1. Kingdom AnimaliaPhylum Arthropoda

  2. Arthropods • “joint-foot” • Have jointed appendages modified for different functions • Largest phylum of animals

  3. Exoskeleton • Hard, protective exterior skeleton • Made of protein & chitin • Flexible for joint movement • Doesn’t grow w/ animal, must shed old to produce new= molting • Limits size of arthropods • Highly developed nervous system

  4. Cicada Moulting

  5. Subphylum- Crustaceans • Include barnacles, krill, shrimps, lobsters, crabs • 3 main body regions • Head • Thorax • Some have fused head/thorax = cephalothorax • Abdomen • Each body segment has pair of appendages

  6. Crustaceans, cont’d • Appendages include: • Sensory antennae • Mandibles/maxillae: for feeding • Walking legs • Legs modified for swimming, reproduction, feeding, and defense • Gas exchange through body or using gills • Vary in reproduction • Most have separate sexes • Most fertilization internal

  7. Types of Crustaceans • Krill • Pelagic, shrimp-like animals • 3-6 cm long • Filter-feeders, feed primarily on zooplankton • Most bioluminescent • Extremely important feed animal. Primary food of several whale species

  8. OM NOM NOM

  9. Barnacles • Sessile (don’t move) • Can cause problems for ships by attaching to hulls & causing increased friction • Some attach to whales and large fish

  10. More Crustaceans • Decapods (“ten feet.”) • Shrimps, lobsters, crabs • Largest in number & size • 5 pairs walking legs usually w/ claws on first • Shrimps & lobsters: distinct & elongate abdomens • Crabs: small abdomen, broad cephalothorax, highly mobile

  11. Chelicerates-Subphylum • Include spiders, ticks, scorpions, horseshoe crabs

  12. Horseshoe Crabs • Not true crabs • Live in shallow coastal waters • 3 parts to body: • Cephalothorax-largest part of body, obvious appendages • Abdomen-smaller, contains gills • Telson- long spike, used for steering & defense • Can walk or swim • Males smaller than females

  13. 6 pairs of appendages • Chelicerae(ka-LIS-er-ree): modified for feeding, replaces mouthparts

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