Baetis alius

Millcreek has attached these 4 pictures to aid in identification. The message is below.

View Full Size (1.4X larger)

Female. 7 mm.

View Full Size (1.5X larger)

Female. 7mm.

View Full Size (1.1X larger)

Male. 6.5 mm.

View Full Size (1.1X larger)

Male. 6.5 mm.

Millcreek	January 24th, 2015, 6:07 pm
Healdsburg, CA Posts: 356	This mayfly was collected from the Russian River near Healdsburg, Ca. It's common from March through October. It's usually found in shallow water 3-12 inches deep and relatively free of silt with a bottom of sand, gravel and cobble. It's fairly easy to identify from the dorsal side of the abdomen with section five, nine and ten being mostly light in color. It's also got a mouth with labial palpi having the inner margin of segment 2 slightly convex to nearly straight as opposed to variously concave. It also has the first gill much smaller than the others. Descriptions to genus were from Merritt, Cummins and Berg (2008). The descriptions to species were from Morihara and McCafferty (1997) "The Baetis Larvae of North America (Baetidae: Ephemeroptera). http://www.ephemeroptera-galactica.com/pubs/pub_m/pubmoriharad1979p139.pdf and MacCafferty, Meyer, Randolph and Webb (2008) "Evaluation of Mayfly Species Originally Described as Baetis Leach (Ephemeroptera: Baetidae)From California. http://www.ephemeroptera-galactica.com/pubs/pub_m/pubmccaffertyw2008p577.pdf

Quick Reply

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

Title	Replies	Last Reply
Baetis adult species IDs? In Male Baetis tricaudatus Mayfly Spinner by Troutnut	0
Acentrella insignificans nymphs (1 more) In the Photography Board by Millcreek	0
Re: Serratella micheneri nymphs In the Photography Board by Millcreek	2	Oct 13, 2014 by Millcreek
Re: Ephemerella maculata (1 more) In the Photography Board by Millcreek	3	Apr 12, 2015 by PaulRoberts
Re: Fallceon spp. (15 more) In the Identify This! Board by Millcreek	4	Nov 21, 2014 by Millcreek
Re: ID Needed, Please (1 more) In the Identify This! Board by Mahones41	14	Apr 27, 2012 by Brookyman
Re: Mayflies which crawl underwater to lay their eggs In General Discussion by Troutnut	1	Jul 22, 2006 by Taxon
Isoperla marmorata and Taenionema pacificum In the Identify This! Board by Millcreek	0
Re: Speaking of Entomology... In General Discussion by Oldredbarn	5	Jan 30, 2015 by Feathers5
Re: Timpanoga hecuba In the Photography Board by Millcreek	10	Sep 19, 2014 by Millcreek