According to John Harte, ecological scientist at the University of California, Berkeley, “there are about one and a half million named species on earth, but we know that many unnamed species exist, and the total number is probably between 5 and 15 million. ”
Menurut John Harte, ilmuwan ekologi di University of California, Berkeley, ” ada sekitar satu setengah juta spesies yang telah dinamai di bumi, tetapi kita tahu bahwa ada banyak spesies yang belum dinamai, dan jumlah totalnya mungkin antara 5 dan 15 juta ”.