“ helopioides ” species group

Diagnosis. The species of this group share three features which are represented by their opposite states in the only member of the “ gracilis ” group, O. gracilis, namely: (1) stria 7 as impressed as other medial striae along elytral anterior third; (2) metacoxal basal sulcus extended on lateral third; and (3) sclerite of internal sac of median lobe without spines. All three traits are considered plesiomorphic.