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Millcreek | December 24th, 2019, 7:31 pm | |
Healdsburg, CA Posts: 356 | This nymph appears to be Ephemerella tibialis formerly known as Serratella tibialis. Check out Allen and Edmunds; http://www.ephemeroptera-galactica.com/pubs/pub_a/puballenr1963p583.pdf Also check https://bugguide.net/node/view/696565/bgpage and https://bugguide.net/node/view/876178 Edit: Just noticed the other two Serratella micheneri sets of photos. These also appear to be Ephemerella tibialis. Also spotted these two sets of photos where you identified the same or a similar nymph as Ephemerella tibialis. http://www.troutnut.com/specimen/1176 http://www.troutnut.com/specimen/1178 | |
Troutnut | December 25th, 2019, 8:19 pm | |
Administrator Bellevue, WAPosts: 2737 | I keyed this one under the microscope using a more recent key than Allen and Edmunds: Jacobus, L. M., N. A. Wiersema and J. M. Webb. 2014. Identification of Far Northern and Western North American mayfly larvae (Insecta: Ephemeroptera), north of Mexico. Joint Aquatic Science meeting, Portland, OR. 176 pp. + suppl. Unpublished workshop manual. The couplet on page 64 distinguishes E. tibialis from the other species: 81e) Maxillary canines strongly serrate laterally; thoracic nota with small, brown excrescences (sometimes difficult to detect), especially between forewingpads = Ephemerella (Vittapallia) tibialis (very similar to E. nuda) If I'm remembering correctly (and I might not be), I looked pretty hard at the maxillary canines and the thoracic nota under the microscope and couldn't find the characteristics pointing to tibialis. It is a bit odd that I didn't mention that in the captions, though, so perhaps I'm misremembering or I just failed to interpret the characteristics correctly. The key does describe Serratella as having "Abdominal terga either without tubercles or with relatively large, blunt and somewhat sinuate tubercles", and one of the other specimens I labeled as micheneri seems to have sharper tubercles than those shown in the corresponding illustration in the key. Perhaps Luke can weigh in? | |
Jason Neuswanger, Ph.D. Troutnut and salmonid ecologist | ||
Millcreek | December 26th, 2019, 8:01 am | |
Healdsburg, CA Posts: 356 | Found these pictures at Bold. They're not very good quality but may give enough to identify the critters. http://v3.boldsystems.org/index.php/Public_SearchTerms?query=%22Serratella%20micheneri%22[tax] http://v3.boldsystems.org/index.php/Public_SearchTerms?query=%22Ephemerella%20tibialis%22[tax] It would be nice to hear from Luke. | |
Title | Replies | Last Reply |
Re: Ephemerella nymph In Ephemerella aurivillii Mayfly Nymph by Millcreek | 1 | Sep 26, 2020 by Troutnut |
Re: Brown Dun hatch/swarm time? In the Mayfly Species Ameletus ludens by Konchu | 10 | Apr 30, 2009 by Troutnut |
Re: Serratella micheneri nymphs In the Photography Board by Millcreek | 2 | Oct 13, 2014 by Millcreek |
Re: Ephemerellinae In the Mayfly Family Ephemerellidae by GONZO | 7 | Oct 4, 2008 by GONZO |
Re: Emerger In the Mayfly Genus Serratella by Martinlf | 6 | Jun 11, 2009 by GONZO |
Re: Mix-up In Siphlonurus autumnalis Mayfly Nymph by GONZO | 2 | Jul 2, 2011 by Troutnut |
Re: Ephemerella dorothea infrequens ? (2 more) In the Identify This! Board by Millcreek | 25 | Jan 8, 2016 by Wbranch |
Re: Dobsonfly In General Discussion by FredH | 8 | Mar 28, 2014 by Taxon |
Re: Serratella levis (2 more) In the Photography Board by Millcreek | 8 | Mar 20, 2016 by Entoman |
Re: Ephemerella maculata (1 more) In the Photography Board by Millcreek | 3 | Apr 12, 2015 by PaulRoberts |