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DO NOW
• Pick up papers on the chair• Read over the crayfish activity• Answer on the Lab
– What is the difference between an arthropod and a mollusk?
• 10 o Clock Buddies
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Agenda
• Discovery • Notes• Tick Brochures (?)
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Crayfish
Dorsal Side Ventral Side
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Arthropods
Science 7Mr. D
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Arthropods• Characteristics – Phylum: Arthropoda
– Largest group of animals– Have jointed appendages which include legs,
antennae, claws, wings, and pincers– Have bilateral symmetry, segmented bodies,
exoskeletons, a body cavity, a digestive system with two openings and a nervous system
– Most have separate sexes and reproduce sexually– Open circulatory system– Use air tubes, book lungs, and gills to obtain
oxygen
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Arthropods• Body Segments
– Bodies of these animals are divided into segments similar to segmented worms
– Some have many segments, others have segments that are fused together to form body regions
• Exoskeleton– A hard outer covering that supports and protects
the internal body and provides places for muscle to attach.
– Doesn’t grow as the animals does, it is shed and replaced during a process called molting
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What are they
• Crustaceans• Centipedes• Millipedes• Spiders and their relatives• Insects
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Crustaceans• Have one or two pair of antennae
and mandibles, which are used for crushing food.
• Most live in water, but some live in moist environments on land—such as pill bug.
• Have five pair of legs, first pair of legs are claws for catching and holding food.
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Crustaceans• Swimmerets are appendages on the
abdomen which help in movement and are used in reproduction; also force water over the gills used in O2 and CO2 exchange
• If a crustacean loses an appendage it can regenerate it
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Who are they?
• Crabs • Lobsters• Barnacles • Shrimp
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Centipedes & Millipedes• Have long bodies and many segments,
exoskeleton, jointed legs, antennae and simple eyes.
• Found in damp environments• Reproduce sexually• Make nests for eggs and stay with them
until they hatch.• Centipedes are predators• Millipedes feed on decaying plant matter.
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Meet the Arachnids
• Spiders • Scorpions• Ticks • Mites
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Arachnids• Have two body regions
– Cephalothorax and an abdomen• Four pairs of legs and no antennae• Many are adapted to kill prey with
poison glands, stingers, or fangs• Some are parasites
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Arachnids• Scorpions
– Have sharp, poison filled stinger at the end of abdomen.
– Have a well-developed appendages which they can grab their prey.
• Spiders– Can’t chew their food, release enzymes into
prey to digest it—then suck the predigest liquid into its mouth.
– Have book lungs where O2 and CO2 are exchanged.
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Arachnids• Mites & Ticks
– Most are parasites– Ticks have specialized mouthparts to
remove blood from the host.– Ticks often carry disease such as
Lyme disease.
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Value of Arthropods• A source of food• Agriculture would be impossible
without bee pollination• Useful chemicals are obtain from
some arthropods• Important part of ecological
community
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Origin of Arthropods• Some fossils are more than 500 million
years old• Scientist hypothesized that arthropods
probably evolved from an ancestor of segmented worms because they have body segments
• The hard exoskeleton and walking legs allowed arthropods to be among the first animals to live successfully on land
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Video
• http://www.youtube.com/watch?v=ySXCdcnKBgg#
• http://www.youtube.com/watch?v=2N0lfprZ5iU
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Activity
• Design a series of signs to be used along hiking trails in national parks to remind hikers of ways to protect themselves from ticks
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DO NOW
• Take out your homework and Notesheet• Answer this question – How are arthropods
different from sponges and cnidarians?• Agenda
– Finish lecture– Insects – Zebra Mussels