The majority of animal species are invertebrates; one estimate puts the figure at 97%. Many invertebrate
Some of the so-called invertebrates, such as the
The word "invertebrate" comes from the form of the Latin word vertebra, which means a joint in general, and sometimes specifically a joint from the spinal column of a vertebrate. In turn the jointed aspect of vertebra derived from the concept of turning, expressed in the root verto or vorto, to turn. Coupled with the prefix in-, meaning "not" or "without".