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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@calihikers Try to stay as clean as possible. Mosquitoes and other invertebrates are attracted to sweat.ratllesnakes are common.Stay alert!
EastlakeJohn (John Maynes) Sat, 07 Nov 2009 19:55:55 -0000
@calihikers Try to stay as clean as possible. Mosquitoes and other invertebrates are attracted to sweat.ratllesnakes are common.Stay alert!
@smileynic it's a stinky little stream which is muddy and icky and has invertebrates which you have to count and sort, lol.
starafar (Pat) Sat, 07 Nov 2009 19:53:25 -0000
@smileynic it's a stinky little stream which is muddy and icky and has invertebrates which you have to count and sort, lol.
Information about Lighting Reef Aquariums, Coral, and other Invertebrates http://bit.ly/2JWvc0 #reefs #aquarium
CaptiveAquatics (Captive Aquatics) Sat, 07 Nov 2009 08:59:26 -0000
Information about Lighting Reef Aquariums, Coral, and other Invertebrates http://bit.ly/2JWvc0 #reefs #aquarium
Fintastic has over 1,300 gallons of aquariums displaying corals and invertebrates from reefs around the world. http://budurl.com/aye8
FintasticFish (Greg Sowers) Fri, 06 Nov 2009 23:26:54 -0000
Fintastic has over 1,300 gallons of aquariums displaying corals and invertebrates from reefs around the world. http://budurl.com/aye8
Fintastic has the largest selection of invertebrates fish in the south. http://budurl.com/4qep
FintasticFish (Greg Sowers) Fri, 06 Nov 2009 23:25:39 -0000
Fintastic has the largest selection of invertebrates fish in the south. http://budurl.com/4qep
I do love my invertebrates. They're delicious. RT @SFriedScientist Love the invert you're with: http://bit.ly/1x95Li
iescience (Hilary Maybaum) Fri, 06 Nov 2009 19:51:41 -0000
I do love my invertebrates. They're delicious. RT @SFriedScientist Love the invert you're with: http://bit.ly/1x95Li

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