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Invertebrates are animals that neither possess nor develop a vertebral column, derived from the notochord. These include all animals apart from the subphylum Vertebrata. Invertebrates are animals with no backbone. More than 90% of the animals are invertebrates among the estimated 15-30 million animal species. Invertebrates exist about anywhere. These have been found in the driest of deserts, high reaches of the atmosphere and canopies of wettest rainforests. They also exist in the frozen Antarctic or under the deepest oceans. Whether batting away irritating flies, unearthing a worm or admiring the complexity of a spider's web and much more all these animals are invertebrates. Invertebrates are so many that it is almost impossible to count them all. There are so many invertebrate animal species of different shapes and sizes that help us in many ways and are vital to our survival. Invertebrates serve as food for humans; are key elements in food chains that support birds, fish, and many other vertebrate species; and play important roles in plant pollination.
About the author
Mr. M. Karthigeyan, working as Assistant Professor in Department of Zoology at Arumugam Pillai Seethai Ammal College, Tiruppattur, Sivagangai District, Tamilnadu in India.
