Invertebrate is a term coined by Jean-Baptiste Lamarck to describe any animal without a spinal column. It therefore includes all animals except those in the subphylum Vertebrata (fish, reptiles, amphibians, birds and mammals).

Lamarck divided these animals into two groups, the Insecta and the Vermes, but now, they are classified into over 30 phyla, from simple organisms such as sponges and flatworms to complex animals such as arthropods and mollusks.

Since invertebrates include all animals except a certain group, invertebrates form a paraphyletic group, but, despite not forming a "natural group" (that is, monophyletic), "invertebrate" is still a widely used term. Invertebrates include 97% of all animal species.

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Modes and regulation of glial migration in vertebrates and invertebrates. http://www.ncbi.nlm.nih.gov/pubmed/19773781
neuropot (neuropot (beta)) Fri, 11 Dec 2009 09:59:28 -0000
Modes and regulation of glial migration in vertebrates and invertebrates. http://www.ncbi.nlm.nih.gov/pubmed/19773781
@Miluda not to mention SPIDER CRABS http://www.bumblebee.org/invertebrates/images/MacrocheiraKaempferi.jpg aaaaa
Doyora (Doyora) Fri, 11 Dec 2009 04:40:47 -0000
@Miluda not to mention SPIDER CRABS http://www.bumblebee.org/invertebrates/images/MacrocheiraKaempferi.jpg aaaaa
Ultimate Secrets To Saltwater Fish And Invertebrates http://bit.ly/GaJdT
AnimalCare20 (Animal Care) Thu, 10 Dec 2009 20:02:56 -0000
Ultimate Secrets To Saltwater Fish And Invertebrates http://bit.ly/GaJdT
Modes and regulation of glial migration in vertebrates and invertebrates. http://www.ncbi.nlm.nih.gov/pubmed/19773781
neuropot (neuropot (beta)) Thu, 10 Dec 2009 18:59:31 -0000
Modes and regulation of glial migration in vertebrates and invertebrates. http://www.ncbi.nlm.nih.gov/pubmed/19773781
@KrisColvin We measure that too. The tough one to really quantify though is "Return on Invertebrates." Slugs are slippery.
thebrandbuilder (Olivier Blanchard) Thu, 10 Dec 2009 16:50:20 -0000
@KrisColvin We measure that too. The tough one to really quantify though is "Return on Invertebrates." Slugs are slippery.
Ultimate Secrets To Saltwater Fish And Invertebrates.: The Ultimate Guide To Keeping Happy,healthy Marine Life (fish... http://bit.ly/B5ZGu
HealthMedical (Health News) Thu, 10 Dec 2009 08:56:44 -0000
Ultimate Secrets To Saltwater Fish And Invertebrates.: The Ultimate Guide To Keeping Happy,healthy Marine Life (fish... http://bit.ly/B5ZGu

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