Abstract
Partial 18S, 5.8S and the intervening internal transcribed spacer region 1 (ITS-1) of nuclear ribosomal DNA from representatives of 10 species of the genus Orius and one outgroup species (Wollastoniella rotunda Yasunaga et Miyamoto) were analyzed by PCR and DNA sequencing. Within the taxa analyzed, the length of the ITS-1 region varied from 230-663 bp. Phylogenetic trees generated from informative sites within the sequences were highly resolved in the proximal regions of the branches, but more ambiguous deeper within the tree. Orius species relationships showed some agreement with anecdotal morphological observations and this study represents a first attempt in establishing Orius species relationships.
