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[cite:476652]
Resource formerly maintained by USDA(1) and extensively cited in the guide as BDWD.
One important piece of info i don't see yet at the new site is the stats summary.
http://www.diptera.org/

Unfortunately the site has be
Unfortunately the site has been down for several months at this point, but it appears to have been mirrored:

http://diptera.dk/

 
Appears to have been resurrected...yet again!
...as "Systema Dipterorum: Version 2.2" (Last updated: 27 March 2019...as of this moment).

The link below currently brings forth the site:

  http://sd.zoobank.org/

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