(body length approx 0.7-0.8 cm)
These nymphs are probably not the same species as the adult below, because they are probably way too mature to be hatching as late as November (they were captured in mid April). They're close enough though...
(body length approx 0.8-0.9 cm)
This beastie was caught in early October, and I almost had myself convinced that it was a Potamanthus nymph due to its fangs (apparently the orthodox term is "tusks"). But, luckily Pat McCafferty of Mayfly Central straightened me out... Its likely that these turn into the adult below.
(body length approx 0.8 cm)
This is a subimago photographed a few hours after hatching.
This particular dun hatched in early November. The nymphs are crawlers, and are fairly active -- meaning that they can often become fish food... They are fairly common, although I have only found one (this one) in the McKenzie.
The McKenzie Page last update: October 27, 1999