Animal Index - Invertebrates

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Of the million or more animal species in the world, more than 98% are invertebrates. Invertebrates don't have an internal skeleton made of bone. Many invertebrates have a fluid-filled, hydrostatic skeleton, like the jelly fish or worm. Others have a hard outer shell, like insects and crustaceans. There are many types of invertebrates. The most common invertebrates include the protozoa, annelids, echinoderms, mollusks and arthropods. Arthropods include insects, crustaceans and arachnids.

Click on the picture or name of the animals below for more information.

Protozoa
Earthworms
clams and mussels
starfish
Protozoa Annelids Mollusks Echinoderms
 
crabs spider dragonfly  
Crustaceans Arachnids Insects  
 

Web Links about Invertebrates:

Invertebrate section at Animal Kingdom

Harvard's Museum of Comparative Zoology

 

 

 

 

 

 
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