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Opostegidae adult   Currently 7 genera, 197 species, and 2 subspecies are recognized (including 2 species of Pseudopostega and 7 species of Opostegoides which were described but unnamed by Puplesis and Robinson, 1999.  Of the 197 species currently known, approximately 87% occur in subtropical to tropical regions. Of these, 84 species (or 42% of the world fauna) are known to be restricted to the Neotropical Region. Four of the seven genera now recognized within Opostegidae occur in the New World. Notiopostega consists of a single species from the Valdivian forests of southern Chile. The genus Neopostega is comprised of 6 species endemic to the Neotropical Region. The predominantly Palearctic/Indomalayan genus Opostegoides is represented in the New World by a single, widespread species, O. scioterma, across the northern United States and southern Canada. It is possible that this species may have been an early introduction into North America, although no known Old World species appears conspecific. The highly apomorphic genus Pseudopostega is by far the most diverse genus in both hemispheres with 84 New World species now recognized (92% of the total fauna for this region). The Oceanic genus Paralopostega is comprised of 6 species endemic to the Hawaiian Islands. Eosopostega, originally described from southern Japan, is now known to include a second species from the Moluccas Islands of Indonesia (Puplesis and Robinson, 1999). The distributional limits of the Old World genus Opostega will continue to be uncertain until the remaining unstudied species originally attributed to ‘Opostega’ have been dissected. Currently it is believed that most of these species will be transferred to other genera, most probably Pseudopostega, with the primary center of true Opostega lying within the Palearctic Region.

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