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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Ultimate Secrets To Saltwater Fish And Invertebrates. | Goal ... http://bit.ly/8ZhXs8
TracyBrinkmann (Tracy Brinkmann) Fri, 18 Dec 2009 23:58:09 -0000
Ultimate Secrets To Saltwater Fish And Invertebrates. | Goal ... http://bit.ly/8ZhXs8
RT @newscientist: First tool use in invertebrates! Octopuses use coconut shells as portable shelters http://bit.ly/7PVrY9 w/ v cool video
plantando (PlantandoConsciencia) Fri, 18 Dec 2009 22:27:26 -0000
RT @newscientist: First tool use in invertebrates! Octopuses use coconut shells as portable shelters http://bit.ly/7PVrY9 w/ v cool video
Some deer, some invertebrates, a green woodpecker and wood and mandarin ducks in Richmond Park http://bit.ly/6i2hQK
UK_Wildlife (Neil Phillips) Fri, 18 Dec 2009 21:25:33 -0000
Some deer, some invertebrates, a green woodpecker and wood and mandarin ducks in Richmond Park http://bit.ly/6i2hQK
She's lying on her tummy on the floor now looking at a chart of animal classifications (invertebrates / vertebrates & so on) in fascination
ZucchiniBikini (Kathy Pollard) Fri, 18 Dec 2009 21:19:27 -0000
She's lying on her tummy on the floor now looking at a chart of animal classifications (invertebrates / vertebrates & so on) in fascination
@Banksyart2 First tool use found in invertebrates earlier this week http://www.livescience.com/animals/091214-octopus-tool-user.html
10dbSoul (Josh Hart) Fri, 18 Dec 2009 20:23:23 -0000
@Banksyart2 First tool use found in invertebrates earlier this week http://www.livescience.com/animals/091214-octopus-tool-user.html
Ultimate Secrets To Saltwater Fish And Invertebrates http://bit.ly/GaJdT
AnimalCare20 (Animal Care) Fri, 18 Dec 2009 20:03:41 -0000
Ultimate Secrets To Saltwater Fish And Invertebrates http://bit.ly/GaJdT

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