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• Jan 2021 : A milestone of 600 unknown articles has been reached.

• Oct 2020 : A milestone of 500 unknown articles has been reached.

• Aug 2020 : Currently (beta) testing the new 'WYSIWYG' (What You See Is What You Get

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Wikenigma - an Encyclopaedia of Unknowns Wikenigma - an Encyclopaedia of the Unknown Science

Definiton of species

“The species problem is the set of questions that arises when biologists attempt to define what a species is. Such a definition is called a species concept; there are at least 26 recognized species concepts. A species concept that works well for sexually reproducing organisms such as birds may be useless for species that reproduce asexually, such as bacteria.”
Source: Wikipedia

The problem of accurrately defining what a 'species' is goes back at least as far as the 1870s. “No term is more difficult to define than 'species', and on no point are zoologists more divided than as to what should be understood by this word.” : from H. A. Nicholson, A manual of zoology. 1872.

Even given the extreme accuracy of gene profiling now available to taxonomists, many are resigned to the fact that an accurate definition of what a species actually is may never be practical.


Also see :Number of speciesplugin-autotooltip__plain plugin-autotooltip_bigNumber of species

"“We demonstrate that after more than six decades, estimates of global species richness have failed to converge, remain highly uncertain, and in many cases, are logically inconsistent.” Source: BROKEN-LINK:Global species richness estimates have n…


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