The answer to this question will indicate the fate of all life on the planet. According to the systematic taxonomy a human belongs to the animal kingdom, the Class Mammalia, the order of primates, the family of hominids. Generic and specific name of the human are the same (Homo sapiens sapiens). Extrapolating the general principle of organization of the living forms on each stage of evolution to the modern stage of development, modern stage should have on at least three species a man. Only by the misunderstanding, these species received the common name - Homo sapiens L. All existing species of man, by definition, possess a developed consciousness. It is their common systemic the peculiarity.
If we can show that on the planet today, there are several kinds of human, we can assert that the present stage of evolution will last from a few million to a few tens of millions of years. Then comes the next stage of evolution. The living forms, as products of a new stage have a new mechanism the systemic organization. This mechanism is identical for the new forms of living of this stage. In the new stage will appear new organisms, having other mechanism of systemic organization.
If we could show that on the planet today there is only one species of human, then we must recognize that we live in the last stage of development of the life on planet. Therefore, it is important to know how many species of man we have today on the planet.
For details see: Systemic semiotics of disease human and society.