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Approximately, how many families have been identified?

I've often often come across figures for the total number of species on Earth. Recently, I found myself wondering about the encompassing ranks above them, specifically family, but I can't recall any figures on family and it's a little difficult finding what I want by typing "family" into a Google search. ;)

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Families (and really, any taxa except species, to some extent) are artificial, fluid and ever-changing. That's not to say they aren't useful, but the number of families is likely to be changing quite a lot on a nearly daily basis, as more and more families are converted into monophyletic groups based on DNA evidence. –  Chinmay Kanchi Feb 6 at 21:12
    
... but just as a round estimate its thousands at least. browsing encyclopedia of life I see scores just in the flowering plants... –  shigeta Feb 9 at 6:15

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I don't know about other groups, but about plants, number of families depends on the system you follow. Recent version of The Plant List (1.1) estimates about 352 000 species of Angiosperms and lists over 400 families. See http://www.theplantlist.org/1.1/browse/A/ It is very good and reliable source of information. Second very good source about plant systematics is database Tropicos provided by Missouri Botanical Garden and Angiosperm Phylogeny Group. See list of families according to APG3 http://www.mobot.org/MOBOT/research/APweb/ and click to "Families" on the top of the page. Just note, that there are also synonyms, so that You can't just count the rows. ;-)

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