Invertebrates are animals without backbones which includes about 97% of all animals except for mammals, reptiles, birds, amphibians, and fish. Scientist usually break down invertebrates into 8 major groups which are Arthropods (which include insects and arachnids), sponges, cnidarians (like jellyfish), annelid worms (like earthworms), flatworms (tapeworms), roundworms or nematodes, mollusks (shellfish and slugs or snails), echinoderms (like star fish). Invertebrates are heterotrophs since they must consume other organisms to survive. This picture is of an earthworms which are invertebrates since they have no back bones and are under the invertebrate category of annelid worms.
Source:
Invertebrates. (n.d.) edHelper.com. Retrieved on August 31, 2011, from
http://www.mysciencesite.com/invertebrates.pdf
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