Invertebrate is an English word that describes any animal without a spinal column. The group includes 97% of all animal species—all animals except those in the Chordate subphylum Vertebrata (fish, reptiles, amphibians, birds and mammals).
Carolus Linnaeus’ Systema Naturae divided these animals into only two groups, the Insecta and the Vermes.
Jean-Baptiste Lamarck, who was appointed to the position of “Curator of Insecta and Vermes” at the Muséum National d’Histoire Naturelle in 1793, both coined the term “invertebrate” to describe such and divided the original two groups into ten. They are now classified into over 30 phyla, from simple organisms such as sponges and flatworms to complex animals such as arthropods and molluscs. (thank you Wikipedia!)
Do you want to see words and pictures of spiders, sponges, snails, sea mats, squids, leeches, jellyfish, crabs, and of course graptolites?
Go no further. Visit The Other 95% who hosts Circus of the Spineless #26. We will let the author explain the 2% difference.
This event happens monthly. Have fun!
Don’t forget to check out Friday Ark hosted by Modulator for a chance to catch the entire 100%. Here is a peek at last Friday’s Friday Ark #162
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