Within the Arthropoda we will discuss the following groups in bold:

             ======================== Trilobites [extinct]
             |
             |     ================== Hexapoda 
             |     |
             |     |           ====== Pauropoda 
             |     |           |
             |=====|           |===== Millipedes 
             |     ==Myriapoda=|
             |                 |===== Centipedes 
Arthropoda===|                 |
             |                 ====== Symphyla 
             |
             |     ================== Arachnida 
             |     |
             |=====|================= Horseshoe Crabs 
             |     |
             |     ================== Pycnogonida 
             |
             ======================== Crustacea 

Where are the Insecta (insects) in this classification scheme? Look under the Hexapoda, which is a grouping that occurs between the Phylum Arthropoda and the Class Insecta. The Hexapoda can be considered a superclass.

Another way to look at it is by thinking about which groups contain which. The Animalia contain the Arthropoda which contain the Hexapoda which contain the Insecta:

Note: material for Exam 1 ends here.