One of the most successful, in terms of biodiversity and distribution, but least studied groups of tenebrionids is the tribe Asidini. The asidine darkling beetles are a large tribe of flightless midsized (4.5mm-35mm) tenebrionids found in many arid and semi-arid regions around the world. Currently the tribe contains approximately 1000 described species in 46 genera divided into four geographically isolated monophyletic clades (Doyen 1993). The North American component of the tribe alone contains over three hundred species and subspecies in 27 genera and makes up approximately 20% of the total North American tenebrionid fauna (Aalbu et al. 2002).
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