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

> > Acerpenna?



The Specimen

Baetis (Blue-Winged Olives) Mayfly DunBaetis (Blue-Winged Olives) Mayfly Dun View 14 PicturesThis dun molted most of the way into a spinner (though the wings got stuck) the evening after I photographed it, so I took some more photos of the spinner.

I found a female nearby, probably of the same species.
Collected September 19, 2006 from Mystery Creek #43 in New York
Added to Troutnut.com by on October 4, 2006

The Discussion

Post Reply
EntomanOctober 25th, 2011, 3:39 pm
Northern CA & ID

Posts: 2604		Hi Jason,

Excepting Bob Newell's nymphs, I believe the photos on the Acerpenna genus hatch page are actually Baetis. Looking closely at the images shows characters hard to reconcile with Merritt IV couplet 37(36') for Acerpenna that reads in part as follows, "...beyond costal process anterior margin of hind wing undulate; terminal segment of male forceps approximately four times as long as wide..."

The specimens do match up with Baetis by the process of elimination as the preceding couplets and those that follow rule out other possibilities by negative determination. The characters of baetis are so variable that the keys have to be structured this way, I guess.

Regards,

Kurt
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

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: Unidentified Baetidae
(2 more)

In the Identify This! Board by Benthosfan		8May 5, 2021
by Benthosfan
Re: Tiny Baetid
In General Discussion by Crepuscular		21Oct 11, 2014
by TroutBums
Re: Mayfly: Baetidae? Spain
In the Identify This! Board by Isidro		16Jun 4, 2008
by And
Re: Beatis or Calebeatis ??
In Beginner Help by Damsel		1May 26, 2018
by Taxon
Re: ID
In Female Baetis Mayfly Dun by Taxon		4Sep 21, 2006
by Troutnut
Re: Need Help With BWOs
In General Discussion by Feathers5		2Aug 20, 2014
by Entoman
Re: ID Needed, Please
(1 more)

In the Identify This! Board by Mahones41		14Apr 27, 2012
by Brookyman
Re: Christmas nymphs and larvae
(6 more)

In the Photography Board by Millcreek		1Jan 2, 2018
by Jmd123
Re: Acroneuria
In Paragnetina media Stonefly Larva by GONZO		3Mar 11, 2012
by Entoman
Re: Arcynopteryx
In Isogenoides hansoni Stonefly Nymph by Taxon		3Nov 9, 2011
by Entoman