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hard thick outer covering made of chitin.
protects and supports internal organs and tissues.
disadvantages of arthropod exoskeleton
relatively heavy so keeps size small in order to grow must molt.
feathery structures used by aquatic arthropods for oxygen and carbon dioxide exchange found in crustaceans.
crayfish,lobsters. 2 pairs of antennae. first pair of legs are chelipds. large claws. swimmerets.
spiders,scorpians, mites,ticks. 2 body regions (cephalothorax and abdomen) 4 pairs of walking legs. no antennae. chelicerae.
largest, most diverse group of arthropods. successful b/c of adaptions. can live many places. flies,butterfly.
Greek: "Spiny Skinned", all are marine, radial symmetry as adults. larvae have bilateral.
pincer like appendages on spines of sea starts and sea urchins. catch food, protect. clean body.
Water Vascular system def:
system of fluid filled, closed tubes that work together enabling echinoderms to move and get food.
sieve-like, disk shaped opening on upper surface of body. water enters and leaves through this.
hollow, thin walled tubes ending in suction cups. movement by pushing out and pulling in tube feet.
5 arm arranged around a central disk, if rays are lost can be replaced through regeneration.
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