Below is a phylogenetic tree showing consensus relationships among deuterostome taxa. Most taxa differ morphologically from other taxa. It is not quite certain to which species these taxa refer. Systematic classifications dealing with both extant and extinct taxa vary more widely. Extinction is the cessation of existence of a species or group of taxa, reducing biodiversity. This section provides links to lists of species of various taxa found in India. Seven species did not group with the others suggesting the need for additional taxa. Numts occur in many eukaryotic taxa. The territory has no endemic plant taxa. Wild "Chrysanthemum" taxa are herbaceous perennial plants or subshrubs. Cladograms are diagrams that depict evolutionary relationships within groups of taxa. The region is rich in medicinal plants and many other rare and endangered taxa. There are also reports of interbreeding difficulties between the two taxa. The following cladogram shows the relationship found between Atracidae and related taxa. The modes of feeding vary greatly between the different echinoderm taxa.