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Phylum Arthropoda animals with jointed appendages

Phylum Arthropoda animals with jointed appendages. includes insects, crustaceans, centipedes, millipedes, and arachnids exoskeleton made of chitin must shed shell to grow. Chelicerates. Includes spiders, ticks, scorpions, horseshoe crabs, and sea spiders Six pairs of appendages

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Phylum Arthropoda animals with jointed appendages

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  1. Phylum Arthropoda animals with jointed appendages • includes insects, crustaceans, centipedes, millipedes, and arachnids • exoskeleton made of chitin • must shed shell to grow

  2. Chelicerates • Includes spiders, ticks, scorpions, horseshoe crabs, and sea spiders • Six pairs of appendages • One pair of chelicerae (for feeding)

  3. Horseshoe crabs

  4. Sea spiders

  5. Mandibulates • Crustaceans • Decapods • Crabs, lobsters, shrimp

  6. Durban Dancing Schrimp

  7. The crustaceans are a large group of arthopods Lobsters Crabs Shrimp Crawfish Barnacles copepods The majority are aquatic, living in either freshwater or marine environments, Some are terrestrial Crustaceans

  8. Crustaceans Continued • The majority move about independently • a few are parasitic and live attached to their hosts • Sea lice, fish lice, whale lice (crustacean lice) • adult barnacles live a sessile life — they are attached head-first to the substrate and cannot move independently.

  9. Sea lice are parasitic

  10. Structure of crustaceans • Crustaceans have three distinct body parts: • head, thorax and abdomen • the head and thorax may fuse to form a cephalothorax

  11. Structure continued • The head has two pairs of antennae, one pair of compound eyes and mouthparts • Mandibles • maxillae • Each body part usually has a pair of appendages • chelipeds • Walking legs • swimmerets

  12. Molting • Like other arthropods, crustaceans have a stiff exoskeleton which must be shed to allow the animal to grow or molt.

  13. Reproduction • crustaceans all have a larval form known as the nauplius • most crustaceans have separate sexes, in many decapods, the eggs are retained by the females until they hatch into free-swimming larvae.

  14. Crustaceans of the Gulf of Mexico • Decapods • Shrimp • Crabs • Lobsters and Lobsterettes • Hermit crabs • Squat crabs and Porcelain crabs

  15. Common Name of some species Sentinel Crab American Spider Crab Pebble Crab

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