Tuesday, January 17, 2017

Invertebrates

Invertebrates are animals that neither possess nor develop a vertebral column (commonly known as a backbone or spine), derived from the notochord.
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".
Invertebrate groupImageEstimated number of
described species[7]
InsectsEuropean wasp white bg02.jpg1,000,000
MolluscsGrapevinesnail 01.jpg85,000
CrustaceansJ J Wild Pseudocarcinus cropped.jpg47,000
CoralsFFS Table bottom.jpg2,000
ArachnidsHobo-spider.jpg102,248
Velvet wormsAysheaia.jpg165
Horseshoe crabsCarcinoscorpius rotundicauda (mangrove horseshoe crab).jpg4
Others
jellyfishechinoderms,
sponges, other worms etc.
68,658
Totals:1,305,075
Invertebrates