You are talking about the size of population, I am talking about number of species.
Yet when you say species, the classification of a species is not an accurate method for the calculating the number of different kinds of living creatures that might have originally existed. The true method is based upon the ability of cell fusion to occur to determine the lineage.
For example, a lion and a tiger are different species but are of the same genus.
LION
Family: Felidae
Genus: Panthera
Species: Panthera leo
TIGER
Family: Felidae
Genus: Panthera
Species: Panthera tigris
While cell fusion would allow them to reproduce, they would produce a different species yet since they are not geographically situated in the wild they do not exist in the wild. However, ligers know to exist are those born in captivity. Ligers and tigons are not a products of evolution but rather procreation.
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