Diversity of Living Things
Classification of Invertebrates

- identify and describe the characteristics of invertebrates and classify invertebrates into phyla (e.g. sponges, worms, molluscs, arthropods)
- compare the characteristics of different kinds of arthropods (e.g. crustaceans such as crayfish, shrimp; insects such as grasshoppers, butterflies, mealworms)

  A Link to Learning web-based student learning activity     www.linktolearning.com

This activity is based on the Classification section of the Life Science Safari web site.


1. What DON'T invertebrates have compared to vertebrates?  ______________________________

2. How many phyla of invertebrates are there? ______________

3. Let's take a brief look at each;

Sponges:  How are sponges different from other animals? ______________________________

Cnidarians:  What does cnidarian mean? ___________________________________________

Give two examples of cnidarians. ________________________________________________

Echinoderms:  What does echinoderm mean? ________________________________________

Where do they live? _______________________________________

Flatworms:   What will happen to a planarian if it's cut in two? __________________________


What type of flatworm could be in a human's intestines? _______________________________

Roundworms:  How does a parasite get its food? ___________________________________


Annelids:  What does annelid mean? _____________________________________________

What annelid are you most familiar with? _____________________________

Mollusks:  What does mollusk mean? __________________________________________

Give an example of;  univalve ___________________    bivalve ___________________

What mollusks are sometimes incorrectly thought to be fish? __________________________


Arthropods:  What does arthropod mean? _______________________________________

What three characteristics define this type of invertebrate?




Let's do a closer comparison of two types of arthropods

Characteristic Insects Arachnids
# of body segments    
# of legs    


Just for fun, try the Arthropod Self-Test;