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Phylum Arthropoda. Spiders, crabs, millipedes, insects, scorpions and lobsters. General information. Largest animal group Have segmented bodies Bilateral symmetry, 3 cell layers and a coelom Phylum name means “jointed feet”

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phylum arthropoda

Phylum Arthropoda

Spiders, crabs, millipedes, insects, scorpions and lobsters

general information
General information
  • Largest animal group
  • Have segmented bodies
  • Bilateral symmetry, 3 cell layers and a coelom
  • Phylum name means “jointed feet”
  • Has an exoskeleton made out of protein and chitin (this is heavy and cumbersome, so arthropods can only get so large before they would collapse under there own weight)
such a big group it is divided into four subphyla
Such a big group it is divided into four “subphyla”
  • Trilobita: extinct now
  • Chelicerta: spiders, scorpions, etc
  • Crustacea: crabs, lobsters, etc
  • Uniramia: millipedes, centipedes and all insects
subphylum chelicerta class arachnida
Subphylum ChelicertaClass Arachnida
  • Spiders, scorpions, ticks, mites…..
  • All have 4 pairs (8) walking legs
  • Most are carnivorous
subphylum chelicerata class merostomata horseshoe crabs
Subphylum ChelicerataClass merostomata: horseshoe crabs
  • “living fossils”
  • Not really crabs at all

All chelicerates have a body divided into a cepalothorax and abdomen

  • Unique to chelicerates are two pairs of appendages attached near mouth:
    • Chelicerae: spiders use these to bite/paralyze prey, and then inject enzymes that liquefy the prey so they can suck the “juice” out
    • Pedipalps: for handling prey, scorpions have large ones modified into claws

All spiders produce silk, some spin webs using “spinnerets”

  • Ticks and mites are usually parasites
subphylum crustacea not focusing on one class
Subphylum Crustacea(not focusing on one class)
  • Crabs, prawns, lobster, crayfish, copepods, water fleas….
  • Primarily aquatic
  • Vary widely in size (microscopic to 6 m)
  • Usually have a hard skeleton reinforced with calcium
  • Usually have 2 pairs of antennae and a pair of mandibles

Have a head, thorax and abdomen

  • (these may be fused into cephalothorax)
  • Appendages vary greatly, crayfish have claws, walking legs, swimmerets and uropods
subphylum uniramia class chilipoda
Subphylum UniramiaClass chilipoda
  • Centipedes
  • I pair of legs per segment
  • carnivores
subphylum uniramia class diplopoda
Subphylum UniramiaClass Diplopoda
  • Millipedes
  • 2 pairs of legs per segment
  • scavengers
subphylum uniramia class insecta
Subphylum UniramiaClass Insecta
  • HUGE group
  • All have head, thorax and abdomen
  • 3 pairs of legs attached to thorax