1/31/12 7th Grade Notes - Arthropods

Guys today we finished our packets in class so you should all have a relatively good understanding of arthropods by now.  Some of their main characteristics are that they are ALL invertebrates, have an external skeleton (called an exoskeleton), a segmented body, and jointed attachments (called appendages).  There are four main groups of arthropods -- crustaceans, arachnids, centipedes & millipedes, and insects. It is interesting to note that crustaceans are actually a Subphylum and the other three groups are Classes of Arthropods.

Crab

Spider

Centipede

Insect

Photos courtesy of Google Images

For those of you who did not finish the Webquest we did in class here is the website - http://evolution.berkeley.edu/evolibrary/article/arthropodstory.  I expect you to have the questions completed and ready to turn in tomorrow.