Scientists have described the range of total number of world's species between 1.7-1.8 million as in 2010. Total number of plants over earth are approximately 3,21,212, total number of vertebrates −62,305, total number of invertebrates1,305,250 and others (bacteria, cyanobacteria, algae) are approximately 51,563. Thus, number of species over earth totals to 1,740,330.