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Arthropods

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Kill more insects than any other animal. Most spiders cannot pierce the human skin ... Insects. Largest group of arthropods. Weigh more than all other animals ... – PowerPoint PPT presentation

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Title: Arthropods


1
Arthropods
2
Arthropods
  • Largest group of animals
  • 75 of all animals
  • Segmented body
  • Jointed limbs
  • Exoskeleton
  • Well-developed nervous system

3
Segmented body
  • Some have many segments that are the same
  • Some have segments with specialized structures
    like wings, antennae, and claws
  • Many have 3 segments called the head, thorax,
    abdomen

4
Jointed Limbs
  • Arthro joint
  • pod foot
  • Jointed limbs are body parts that bend at a joint
  • Easier to move

5
External Skeleton
  • Exoskeleton
  • Hard outer covering
  • Made of chitin
  • Stiff frame to support the body
  • Suit of armor to protect organs
  • Keeps water inside body and prevents drying out

6
Well-developed Nervous System
  • Head
  • Brain
  • Nerve cord
  • Simple eyes to sense light
  • Compound eyes to see images they have many
    light detectors
  • Bristles to sense motion, vibration, pressure,
    and chemicals
  • Antenna a feeler that senses touch, taste, or
    smell

7
Centipedes Millipedes
  • One pair of antenna
  • Mandibles mouth parts that can pierce and chew
    food
  • Centipedes?one pair of legs per segment
  • Millipedes ?2 pairs of legs per segment
  • Record for millipede legs is 752

8
Crustaceans
  • Shrimps
  • Crabs
  • Lobsters crayfish
  • Pill bugs
  • Most live in water
  • Gills for breathing in the water
  • Mandibles to eat
  • 2 compound eyes on the ends of 2 eyestalks
  • 2 pairs of antennae

9
Arachnids
  • Spiders
  • Scorpions
  • Mites
  • Ticks

10
More about Arachnids
  • 2 main body parts cephalothorax and abdomen
  • Cephalothorax head-thorax
  • 4 pairs of legs (8)
  • No antennae
  • Cheliscerae claw-like mouth parts
  • Some spiders have 8 eyes
  • Kill more insects than any other animal
  • Most spiders cannot pierce the human skin
  • Ticks live in forests lawns
  • The segments of a tick are joined as one
  • Ticks are parasites that feed on blood
  • Ticks can carry diseases like Lyme disease

11
Insects
  • Largest group of arthropods
  • Weigh more than all other animals combined
  • All have 3 main body parts
  • Head, thorax, abdomen
  • All have 6 legs (T)
  • All have 2 antennae (H)
  • 2 compound eyes (H)
  • Mandibles to eat (H)
  • 1 or 2 pairs of wings (T)
  • Some have no wings
  • Live everywhere but in the oceans

12
More on Insects
  • GOOD
  • Important for farming pollination
  • BAD
  • destroy crops
  • spread disease
  • Bite people and suck our blood

13
Complete Metamorphosis
  • Metamorphosis ? the process of an insect changing
    form during its life cycle
  • Most insects go through complete metamorphosis
    (4 Stages)
  • Egg
  • Larva
  • Pupa
  • Adult

14
Incomplete Metamorphosis
  • 3 Stages
  • Egg
  • Nymph
  • Adult
  • Nymph looks like adult but smaller no wings
  • A nymph grows into an adult through molting
  • Molting is when an animal sheds its exoskeleton
    (outgrows it)

15
The end
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