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Which roughly equals 50 per day. Now compared to the 1200~ species extinct each day it seems far too few, but keep in mind that the number of species we find might be lower than the number of species created each day.
The document proposes a working estimate of 13.6 million species on Earth. But some field scientists, such as Erwin, dismiss this as armchair biology.. Of course, the only way to really find out how many species inhabit the planet is to go out and count them, one by one. Spurred by concern over species extinctions, several scientists over the past decade have advocated such a complete global biological survey.