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An '''invertebrate''' (in contrast to a [[vertebrate]]), is an [[animal]] with no [[spine]]. Most living things are invertebrates, including [[arthropod]]s, [[mollusc]]s, and [[bacteria]].
An '''invertebrate''' (in contrast to a [[vertebrate]]), is an [[animal]] with no [[spine]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>
[[Shark]]s and [[sting ray|rays]] are a special class under this description, since they do not have bony [[skeleton]]s, and hence no spine. They do, however, have a similar structure to vertebrates. They are called [[notochord]]s.
Most living animals are invertebrates, including [[arthropod]]s, [[mollusc]]s, and [[annelids]].
The phyla contained in Invertebrata are:
The phyla contained in Invertebrata are:
*[[Protozoan|Protozoa]] - Mostly simple, single-celled organisms
*[[Protozoan|Protozoa]] - Mostly simple, single-celled organisms
*[[Porifera]] - [[sponge|Sponge]]s
*[[Porifera]] - [[Sponge]]s
*[[Coelentera]] - Hydra, [[jellyfish]], [[sea anemone|anemones]] and [[coral]]s
*[[Coelenterata]] - Hydra, [[jellyfish]], [[sea anemone|anemones]] and [[coral]]s
*[[echinoderms|Echinoderm]]a - [[Starfish]], [[sea urchin]]s and [[sea cucumber]]s
*[[echinoderms|Echinoderm]]a - [[Starfish]], [[sea urchin]]s and [[sea cucumber]]s
*[[Annelid]]a - [[Worm]]s
*[[Annelid]]a - [[Worm]]s