Troutnut.com Fly Fishing for Trout Home
User Password
or register.
Scientific name search:

> > Siphlonuridae

WillmilneMay 22nd, 2009, 5:04 pm
Manitoba Canada

Posts: 19
Found a couple of S.xxxx nymphs

I think the first might be S. quebecensis



I'm not sure of the second one????



any suggestions?

Will
TaxonMay 23rd, 2009, 7:42 am
Site Editor
Plano, TX

Posts: 1301
Hi Will-

Another possibility might be Siphlonurus phyllis, which I believe to be the only Siphlonurus species other than S. alternatus present in Manitoba.
Roger Rohrbeck
www.FlyfishingEntomology.com
KonchuMay 23rd, 2009, 11:13 am
Site Editor
Indiana

Posts: 496
what was the habitat for each one?
WillmilneMay 23rd, 2009, 2:06 pm
Manitoba Canada

Posts: 19
Habitat - silt/clay substrate /turbid large river - 400' wide / both from the same location at the river edge in approx 2' of water on the river side of small clumps of flooded grasses.

We have S.alternatus and S.phyllis listed here , but I get the sense we may have more here than the lists suggest.

I'm probably wrong on the first one . Ventral markings are a thin central dark stripe thinner at segment 1 than 9 - broken fine dark stripe at the outer edges of segments 1-9. approx 11-12mm

Number 2 is approx 14-15 mm with no discenrable marking on the ventral side.

Couple of larger images that may help. Since I like to photography these critters live and they rarely stay motionless some details may be blurred.

http://www.watersidemb.ca/siph/siphfull1a.jpg

and

http://www.watersidemb.ca/siph/siphfull2a.jpg

Will
TaxonMay 23rd, 2009, 3:09 pm
Site Editor
Plano, TX

Posts: 1301
Will-

Your higher resolution photos both show "abdominal segments above marked with conspicuous branched pattern", and the 1st higher resolution photo shows "a prominent brown spot on each lateral margin midway between base and apex", which is described by Justin & Fannie Leonard on page 77 of their book, Mayflies of Michigan Trout Streams, as being characteristic of Siphlonurus alternatus.

Do you have a ventral photo of the sternite markings you described on the "first" one?
Roger Rohrbeck
www.FlyfishingEntomology.com
KonchuMay 23rd, 2009, 4:05 pm
Site Editor
Indiana

Posts: 496
keep in mind that several spp are unknown as nymphs
WillmilneMay 23rd, 2009, 5:07 pm
Manitoba Canada

Posts: 19
Roger- I will make some images on Monday of the ventral markings. Not sure if it means anything but over the period I was collecting on that day .Nymph 1 outnumbered nymph 2 by a ratio of approx 6:1

I did notice comparing the two images that nymph image 1 has lateral projections on segment 10 and nymph 2 does not the plot thickens:)

Konchu - I am new to all this but beginning to understand that your statement however frustrating is very true:))

Obviously I have been taking rather portrait/dorsal views of the nymphs I have been finding. It's becoming clear to me ( I bought Merrit and Cummins and have been rummaging around on Famu) that there must be a set views that would serve to document the salient details that would be of more use than simple portraits.

What would constitute a usefull set of nymph stage images ..

Views-

Dorsal
Ventral
Profile
High magnification mouth parts

I know there are sampling protocols are there imaging protocols???

Will

TaxonMay 23rd, 2009, 5:16 pm
Site Editor
Plano, TX

Posts: 1301
Will-

Please re-read my above post, which I was busy updating at the same time as your made your above post.
Roger Rohrbeck
www.FlyfishingEntomology.com
WillmilneMay 25th, 2009, 12:30 pm
Manitoba Canada

Posts: 19
Thanks Roger-

Ventral view of Nymph 1 -

http://www.watersidemb.ca/siph/sipventral1a.jpg

Will
TaxonMay 25th, 2009, 1:47 pm
Site Editor
Plano, TX

Posts: 1301
Will-

Your ventral view of nymph 1 reveals markings extremely similar to those illustrated for Siphlonurus rapidus on page 79 of Mayflies by Knopp and Cormier.
Roger Rohrbeck
www.FlyfishingEntomology.com

Quick Reply

You have to be logged in to post on the forum. It's this easy:
Username:          Email:

Password:    Confirm Password:

I am at least 13 years old and agree to the rules.

Related Discussions

TitleRepliesLast Reply
Re: Siphlonurus sp.
In Ameletus Mayfly Nymph by Millcreek
1Feb 2, 2020
by Troutnut
Re: cannot determine species
In Male Psychoglypha Caddisfly Adult by Creno
6Apr 15, 2013
by Troutnut
Re: Maccaffertium mediopunctatum
In Maccaffertium ithaca Mayfly Nymph by Taxon
1Jun 5, 2007
by Quillgordon
Ecdyonurus nymphs
In Ecdyonurus criddlei Mayfly Nymph by Jmw975
0
Re: Perlid identification assistance request
In the Identify This! Board by Tsali
9Jun 17, 2015
by Oldredbarn
Re: Looks like
In Maccaffertium modestum Mayfly Nymph by Brookyman
2Apr 14, 2013
by Brookyman
Re: Hind wings?
In Female Procloeon Mayfly Dun by Taxon
6Jul 14, 2011
by Troutnut
Re: Night Time is the Right Time
In the Photography Board by Crepuscular
8Sep 17, 2013
by Entoman
Re: M. vicarium?
In Maccaffertium vicarium Mayfly Nymph by Entoman
8Jul 2, 2012
by Gutcutter
Re: Site updates from May 16, 2012
In Site Updates by Bnewell
3Jun 12, 2012
by Troutnut
Most Recent Posts
Re: Salmon smolt
In the Photography Board by Wbranch
Re: gang hooks for worms with 4 pd. line and tiny hooks
In General Discussion by Geneso (Wbranch replied)
Re: Trout Unlimited, who are they?
In General Discussion by Red_green_h (Partsman replied)
Re: Old Orvis line with alternating black and cream colors??
In Gear Talk by Craveman1 (Martinlf replied)
From yesterday on the Bitterroot river
In the Identify This! Board by Leskorcala
Re: Need help ID Nemoura nymph
In the Identify This! Board by Cherylkorca (Leskorcala replied)
Re: Pretty float down the Yakima Canyon
In Site Updates by Troutnut (Mgbenjamin5 replied)
Re: Shiawassee River (Michigan)
In General Discussion by Brian314 (Strmanglr replied)
Re: Skwala question
In Skwala Stonefly Nymph by Gillybilly (Leskorcala replied)
Re: Little Manistee
In Fishing Reports by Summer_doug (Troutnut replied)