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Published bySilvia Cole Modified over 9 years ago
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Objective: Class Arachnida
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Arachnida Two body sections 1. cephalothorax: fused head and thorax 2. abdomen 4 pairs of legs
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2 pairs of mouthparts chelicerae: fanglike, paralyze prey pedipalps: used to manipulate prey
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Body Characteristics Malphighian tubules:. Reduce water loss; absorb water from waste book lungs: exchange gases with atmosphere
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Spiders Hunters Search for prey tarantulas Weavers “sit-and-wait” Weave a web from silk glands spinnerets: organs that spin fibers All produce silk, but not all produce webs
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Scorpions Nighttime hunters Live in deserts Pedipalps are pincers Used for defense and prey Poisonous stinger
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Mites and Ticks Parasites Plants or animals Ticks! Lyme Disease Sucking mouthparts and claws to hold onto host Free-living WARNING! Graphic Pictures on next slide
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Arachnid Bites Day 6 Day 10 Brown Recluse Bite Lyme Disease (severe)
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Crustacea
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Decapods Means “ten legs”
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Decapod Body Cephalothorax and abdomen Exoskeleton: Made of calcium carbonate carapace: shield that covers back of cephalothorax mandibles: mouthparts
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Barnacles
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Copepods Krill Food for whales and fish
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Isopods Terrestrial Pill bugs (wood lice) “rolley-polley”
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Class Insecta
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Characteristics Head, thorax, abdomen Wings Extension of exoskeleton Malpighian tubules Trachael system no book lungs Compound eyes
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Insect Success Ability to Fly Escape predators Find food Find mates New habitats
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Metamorphosis Immature to mature Incomplete(Simple) Metamorphosis Juvenile(nymph) to adult Juvenile smaller, no wings Complete Metamorphosis Larva and adult different
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Class Diplopoda Millipedes 2 pair legs per segment Eat decaying matter
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Class Chilopoda Centipedes Pair of legs per segment Predators
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