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Line 1: − + − − [[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.
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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>
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>
Most living things are invertebrates, including [[arthropod]]s, [[mollusc]]s, and [[bacteria]].
Most living animals are invertebrates, including [[arthropod]]s, [[mollusc]]s, and [[annelids]].
The phyla contained in Invertebrata are:
The phyla contained in Invertebrata are: