What does benthic macro invertebrates mean?

Small, bottom-dwelling aquatic animals without vertebrae

Explanation:

Small, microscopic animals without backbones, and that are usually found at the bottom of the body of water they are in (thus earning the prefix benthic) such as snails, worms and beetles. They usually are the aquatic larval stages of insects.

i believe it is capitalists.  

where is the picture?