4/27/15 Mr. Faia 6 th Grade Science

 875,000 species (and probably a lot more)  Include:  Spiders  Moths  Lobsters  Centipedes  Scorpions  Ants

 Traits all arthropods have in common:  Invertebrate  External Skeleton  Segmented Body  Jointed Appendages  What are examples of appendages?

 More common traits:  Open Circulatory System  What does this mean?  Sexual Reproduction

 The outer skeleton is called the exoskeleton  Hard covering  Waterproof  Protects the animal  Prevents water evaporation

 The exoskeleton is made of chitin  Chitin is a long chain of molecules that is called a polymer  Rubber and Cotton fibers are also polymers

 What do you think happens when an arthropod grows?  Does the exoskeleton grow?

 Molting is the process of shedding an exoskeleton and forming a new one

 Similar to an earthworm BUT  Each segment has a specialized function to perform

 Arthropods have jointed appendages  Include legs and claws  Antenna are sense organs on the heads of many arthropods

 Arthropods have been on Earth for 540 million years  First arose in oceans, but many adapted to live on land

 How many species of arthropods are there?  What are examples of appendages?  What is an open circulatory system?  What does an exoskeleton do?  How do arthropods grow?  What is chitin?  How are arthropod segments different from earthworm segments?  How long have arthropods been on Earth?

 The major groups of arthropods include:  Crustaceans  Arachnids  Centipeds  Millipedes  Insects

 Has 2 or 3 body sections  3 pairs of chewing appendages  5 pairs of legs

 2 pairs of antennae  Only arthropod with 2 pairs of antennae

 Examples of crustaceans include:  Shrimp  Crabs  Crayfish  Lobsters

 Begin as microscopic swimming larvae  Go through a metamorphosis into adulthood  Metamorphosis is a major body change

 Live in nearly every water environment  Usually get oxygen through gills

 Crustaceans can be:  Scavengers  Carnivores  Herbivores

 Only have 2 body sections  1 st section is a head and chest combined  2 nd section is the abdomen  The abdomen contains reproductive organs and the digestive tract

 8 legs, 0 antenna  Breath using ‘Book Lungs’

 Spiders are predators  Can run down prey like the Tarantula  Can use a web like Golden Garden Spider  Fangs inject venom and consume food

 Mites are parasites  Can be microscopic  Help make up dust

 Ticks are also parasites  But they live on the outside of the body  Virtually every land animal has a species of tick that will feed on its blood

 Scorpions are usually found in hot climates  They will generally feed at night  Find cool shaded areas during the day  Scorpions have a stinger at the end of their tails to inject venom  2 chelipeds to grasp food and defend

 Centipedes are predators that inject venom into prey  Millipedes are herbivores that eat partly decayed leaves

 Identify 4 characteristics that all arthropods share.  List the major groups of arthropods.  What characteristic distinguishes crustaceans from other arthropods?  What is molting?  What are the main characteristics of arachnids?  How do spiders feed?  What are the pincers of arthropods called?

 Create a chart that compares the # of body sections, # of legs, # of antennae, and what type of environment the animals are found for Crustaceans, Arachnids, and Insects  Sketch 5 examples for your groups type of Arthropod or Mollusk  Answer the questions the group was given in complete sentences.  Include 10 facts that go along with your group’s animals.  Include 5 questions about your group’s animals.