The 18S rDNA was amplified using the primers 18e and 18g’ (Table 1) in a 20 ll reaction mixture, which comprised 1 ll extracted genomic DNA, 5 ll 1 mM deoxy-ribonucleotide triphosphates (dNTPs, MBI Fermentas), 0.25 ll of each primer, 2.5 ll 10X Taq buffer (MBI Fermentas), 1.25 ll 25 mM MgCl2, 1 ll Taq polymerase (2 U) (MBI Fermentas) and 12 ll DEPC water.