Invertebrates are animals that neither develop nor retain a vertebral column (commonly known as a spine or backbone), which evolved from the notochord. It is a paraphyletic grouping including all animals excluding the chordate subphylum Vertebrata, i.e. vertebrates. 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. 97% of the animals are invertebrates among the estimated 2.16 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 ... The invertebrates are characterized by the absence of a vertebral column and they can be classified mainly into nine types according to the Phyla. Invertebrates are the largest group in the animal kingdom which are mainly included in the Phyla Protozoa, Porifera, Cnidaria, Annelida, Platyhelminthes, Aschhelminthes, Arthropoda, Mollusca, and Echinodermata. Invertebrate animals play an important role as agricultural pests, parasites, or vectors of parasitic infections to humans and other ... Invertebrates are animals without backbones. Learn their definition, types, characteristics, classification, evolution, and importance.
