ARTHROPODS

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ARTHROPODS
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About 6 billion people live on Earth.

• Guess how many arthropods scientists estimate are
  on Earth?
• About
• one billion billion!

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What are the characteristics of arthropods?

• Jointed limbs
• Segmented bodies
• (with specialized parts)
• Exoskeleton
• Well-developed
• nervous system

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JOINTED LIMBS

• Jointed limbs allow arthropods to move easily.

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SEGMENTED BODIES

• with specialized parts

For example, some arthropods have wings,
antennae, gills, pincers or claws. bee
nectaring http//www.youtube.com/watch?vHQlGel0l_
aE
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EXOSKELETON

• This is an external skeleton made of protein and
  chitin.
• This provides a stiff frame that supports the
  animals body and protects it like a suit of
  armor!

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WELL- DEVELOPED NERVOUS SYSTEM
All arthropods have a head and a well-developed
brain
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Compound Eyes
Many arthropods have compound eyes.
They are made up of many identical,
light-sensitive cells
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• FUN FACT

• A person would need a compound eye of at least 1
  meter diameter in order to see as well as a fly!

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How do you think arthropods are classified?
They are classified by their body parts.

• KINDS OF ARTHROPODS
• Centipedes and Millipedes
• 2. Crustaceans
• 3. Arachnids
• 4. Insects

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Centipedes Millipedes
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• HEAD
• ANTENNAE
• MANDIBLES (jaw)
• HARD HEAD CAPSULE

• Centipedes have one leg per segment and
  millipedes have two legs per segment.

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Crustaceans

• Shrimps
• Barnicles
• Crabs
• Lobsters

• Most crustaceans are aquatic and have gills (for
  breathing underwater
• All crustaceans have
• 2 pair antennae
• Mandibles
• 2 compound eyes

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compound eyes
gills
antennae
mandibles
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Arachnids

• Include
• Spiders
• Scorpions
• Mites
• Ticks
• Daddy long legs

• Arachnids have two main body parts
• Cephalothorax- a combination of head and
  thorax
• Abdomen

Other body parts 8 walking legs (4 pairs) 8
simple eyes (NOT compound) Chelicarae -mouth
parts which look a lot like fangs

• Walking tarantulas Bill Nye
• http//www.youtube.com/watch?vNuqLp6PwkzQ

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• SPIDERS TICKS!
• Only a few arachnids are dangerous to humans.
• Do you know what they are?
• The black widow and two species of brown spider.
  However- their bites CAN be treated medically!

IMPORTANTSpiders kill more insect pests than
any other animal
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• Do you live on Long Island?
• If you do, then you had better look out for
  another arachnid!
• TICKS live in wooded and weeded areas and carry
  many diseases like Lyme Disease and Rocky
  Mountain Spotted Fever!

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How do spiders catch their prey?

• How are spiders able to walk on their sticky webs
  without getting stuck themselves?

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Why dont spiders stick to their own webs?

• Lets do a little experiment!

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What is the largest group of arthropods?
THATS RIGHT! ITS INSECTS!
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What are the characteristics of Insects?

• Head
• Thorax
• Abdomen
• One pair antennae
• Two compound eyes
• 3 pairs of legs (6 total)
• 3 pairs of mouth parts
• (including mandibles)

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How do insects fit in to the ecosystem?
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Lets sing the song!

• Head, thorax, abdomen, abdomen!
• Head, thorax, abdomen, abdomen!
• Eyes, six legs, antennas, too
• Head, thorax, abdomen, abdomen!

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METAMORPHOSIS
The process in which an insect changes form as
it develops from larva to adult.
Complete metamorphosis

• http//www.youtube.com/watch?vNnJA_BkPF_YNR1

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Incomplete Metamorphosis
Complete Metamorphosis
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Insects
Body structure http//entochem.tamu.edu/insect_st
ructure-function/index.html

• Antennae
• http//www.youtube.com/watch?vDfwDz6VZ1mI
• Mantis eats mantis
• http//www.youtube.com/watch?vKYp_Xi4AtAQ

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Review

• Name four classes of arthropods.
• What is the difference between complete
  metamorphosis and incomplete metamorphosis?
• Which animal phylum contains the most species?
• How are arthropods classified?

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ECHINODERMS
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Lets name some echinoderms!

• Sea Stars
• Sea Urchins
• Sea Lilies
• Sea Cucumbers
• Brittle Stars
• Sand Dollars

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VIDEO LINKS WORTH WATCHING

• radial symmetry
• http//www.youtube.com/watch?vVf56JstJxsYfeature
  related
• Sea cucumber feeding
• http//www.youtube.com/watch?vsak-OBj4zEU
• Echinoderms (for lang)
• http//www.youtube.com/watch?vfMbuJmCr2jI
• Crab and sea urchin (MUTE IT!)
• http//www.youtube.com/watch?vFo-gcZ78Ij0feature
  related