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Mayfly Genus Ameletus (Brown Duns)

Taxonomic Navigation -?-
Species in AmeletusNumber of SpecimensNumber of Pictures
Ameletus celerBrown Dun00
Ameletus lineatusBrown Dun00
Ameletus ludensBrown Dun00
Ameletus oregonensisBrown Dun00
Ameletus sparsatusBrown Dun00
Ameletus subnotatusBrown Dun00
Ameletus validusBrown Dun00
Ameletus veloxBrown Dun00
Ameletus vernalisBrown Dun00

25 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 occasionally mistaken (especially in early instars (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.)) 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. As mature nymphs their large size and intense maculation (the scientific common name for this family in some circles is Painted Minnow nymph) make them much easier to differentiate from others.

Pictures of 21 Mayfly Specimens in the Genus Ameletus:

Specimen Page:123
Specimen Page:123

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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