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Chapter 11 Complex Invertebrates Section 1 Arthropods p.202207

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( butterflies, spiders, scorpions) About 10 million estimated species. ... Insects: ants, bees, butterflies. Crustaceans: crayfish, lobsters, crabs ... – PowerPoint PPT presentation

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Title: Chapter 11 Complex Invertebrates Section 1 Arthropods p.202207


1
Chapter 11Complex InvertebratesSection 1
Arthropods p.202-207
2
Arthropod
  • Means jointed leg. The most complex
    invertebrates. They have jointed legs, an
    exoskeleton, and body segments. (butterflies,
    spiders, scorpions) About 10 million estimated
    species. Weve only identified about 850,000
    species so far!

3
Appendages
  • Legs, claws, jaws, fangs, egg depositors, pincers

4
Exoskeleton
  • A hard outer skeleton made of chitin. This
    chitin protects the soft part of the body and
    prevents water loss.

5
Molting
  • The shedding of the exoskeleton. They shed in
    order to grow. They are defenseless until a new
    exoskeleton grows!

6
Open Circulatory System
  • The blood fills the body cavity instead of being
    inside of blood vessels.

7
Tracheae
  • The air passage way used for breathing by land
    arthropods.

8
Book Lungs
  • A special breathing structure that looks like the
    pages in a book. Found in spiders.

9
Spiracles
  • Tiny openings in the exoskeleton that allow air
    to enter and exit the body of an arthropod. They
    are found on the abdomen.

10
Common Types of Arthropods
  • Arachnidsspiders, scorpion, mites, ticks
  • Insects ants, bees, butterflies
  • Crustaceans crayfish, lobsters, crabs
  • Myriapods centipedes, millipedes

11
Arachnids
  • Not insects. Have 8 legs. Have two body
    segments called the cephalothorax and the abdomen.

12
Arachnid Characteristics
  • Cephalothorax head and chest of an arachnid.
  • Abdomen part of the organism that contains most
    of the internal organs.
  • Simple eyes can sense light and dark, but cant
    form images.

13
Arachnid Characteristics
  • Spinnerets small tubes on the abdomen where a
    liquid protein which makes the web passes.

14
Ballooning
  • Method by which young spiders travel using the
    wind and a strand of web.

15
Orb Web
  • A spiral shaped web with a zig zag pattern.

16
Sheet Web
  • A sheet web is found on the ground. Prey are
    pulled down through the web.

17
Tarantula
  • The largest of the spiders. It is a wolf spider.
    It doesnt spin a web, but has a bite that is
    painful and will make a person ill. Found in SW
    United States.

18
Black Widow
  • Female bites can make a person seriously ill and
    is sometimes fatal. Common in the southern and
    western parts of the US.

19
Scorpions
  • Found in SW US
  • They have a barbed stinger at the tip of their
    abdomen.

20
Crustaceans
  • A class of arthropods
  • They have 2 body divisions, 2 pairs of antenna,
    working legs, and most live in water.

21
Antenna
  • Sense organs that give the animal information
    about its environment.

22
Antennules
  • Short antenna used primarily for balance

23
Mandibles
  • The jaws, which are used for chewing.

24
Walking Legs
  • Four pairs of legs used for walking.

25
Swimmerets
  • Much shorter than legs and are used to help swim.

26
Uropod
  • Flipper-like structure at the posterior end which
    is used to help swim.

27
Compound Eyes
  • Found on crustaceans. They have more than one
    lens and form multiple images.

28
Myriapods
  • A class of arthropods
  • Means having many legs
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