Quote:
Originally Posted by shuck raider
Sounds a bit like Pat O'Reilly's 'Magnificent Seven' from his 'Matching the Hatch' book.
The concept always seemed a little over-simplistic to me, but then I do like lots of patterns in me box to choose from 
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I think it boiled down to various sized Greenwell's Glories in the end.... cr@p book IMHO.
If however wrongfoot is refering to the five 'Families' of the 'Order'
Ephemeroptera (46 British species - give or take) then:
Baetidae (agile darters) 14
Ephemerellidae (spiny moss-crawlers) 2
Ephemeridae (burrowing Mayflies) 3
Heptageniidae (stream/stone clingers) 11
Leptophlebiidae (prongills) 6
The totals don't quite add up. The quite scarce
Potomanthus isn't now a burrower and [i]Caenis[/] are a curse.