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Mayfly Genus Ameletus (Brown Duns)

Taxonomic Navigation -?-
» Genus Ameletus (Brown Duns)
Species in AmeletusNumber of SpecimensNumber of Pictures
Ameletus celerBrown Dun12
Ameletus lineatusBrown Dun00
Ameletus ludensBrown Dun322
Ameletus oregonensisBrown Dun13
Ameletus sparsatusBrown Dun00
Ameletus subnotatusBrown Dun11
Ameletus validusBrown Dun00
Ameletus veloxBrown Dun00

26 species aren't included.
Common Name
MatchCommon Name
***Brown Duns
Pictures Below ↓
  

Where & When


Preferred Waters: Streams of all sizes

Altitude: Up to 11,000 feet
There are many Ameletus species in the United states, but only two are regarded as significant: Ameletus velox in the West and Ameletus ludens in the East. Neither one constitutes a widespread superhatch, but they can be very abundant locally.

Hatching Behavior


These mayflies emerge sporadically by crawling out of the water as nymphs.

Nymph Biology


Ameletus nymphs are very fast swimmers. They are easily mistaken for some species in the Baetidae family, having roughly similar body shape and coloration. They are easily separated under close inspection based on gill coloration and prominent mouth parts.

Pictures of 9 Mayfly Specimens in the Genus Ameletus:

Specimen Page:12
Ameletus ludens (Brown Dun) Mayfly NymphAmeletus ludens (Brown Dun) Mayfly Nymph View 9 Pictures
Collected March 29, 2005 from Salmon Creek in New York
Added to Troutnut.com by Troutnut on April 7, 2006
Ameletus ludens (Brown Dun) Mayfly NymphAmeletus ludens (Brown Dun) Mayfly Nymph View 7 Pictures
Collected April 1, 2007 from Mystery Creek #62 in New York
Added to Troutnut.com by Troutnut on April 3, 2007
Ameletus (Brown Duns) Mayfly NymphAmeletus (Brown Duns) Mayfly Nymph View 7 PicturesI think this is a pretty early instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.) Ameletus nymph. It's certainly a striking one.
Collected May 6, 2007 from Mongaup Creek in New York
Added to Troutnut.com by Troutnut on May 18, 2007
Specimen Page:12

Recent Discussions of Ameletus

Brown Dun hatch/swarm time? 10 Replies »
Posted by Konchu on Apr 25, 2009 in the species Ameletus ludens
Last reply on Apr 30, 2009 by Troutnut
Has anyone else watched a Brown Dun hatch or swarm? If so, what time of day did you see it, and how long did it last?

I came upon a woodland swarm late this evening. I thought I saw mating occurring higher above the stream. This would mean that parthenogenesis is not necessarily happening in "my" stream. I watched for awhile, but got distracted (venomous snake). I hope to catch it (the hatch, not the snake) again tomorrow night and note the egg-laying behavior and possibly nab some male adults for science. There's a range of nymph ages, so I should be OK, weather permitting.
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