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Photo#1478970
Mayfly nymphs - Drunella

Mayfly nymphs - Drunella
Forest Falls, San Bernardino County, California, USA
June 4, 2017

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Mayfly nymphs - Drunella Mayfly nymphs - Drunella Mayfly nymphs - Drunella Mayfly nymphs - Drunella

Moved
Moved from Mayflies.

Drunella
Hi James-

I believe these mayfly nymphs to be of genus Drunella, either Drunella coloradensis or Drunella flavilinea, which are extremely difficult to distinguish from one another short of microscopic examination.

 
Thank you Roger
Do both occur in this mountain range? No matter -- this is a new family for me.

 
Where found
Per the scientific paper, Mayflies (Ephemeroptera) of the Far Western United States. Part 3: California by M. D. Meyer and W. P. McCafferty, in San Bernadino County:

Drunella coloradensis have been identified from: 1 mi E Arrow Bear L, Hwy 18, 29-VI-1967, and Lytle Cr RS, 24-VI-1968, Evans (PERC), and Barton Flats, 20-VII-1953, Belkin, and Camp Baldy, VII-1952, Hogue, and Snow Crest, San Antonio Falls, 20-VI3781968, Honey, and Deep Cr, 1.5 mi N Running Springs, 3-VI-1978 (LACM), and San Antonio Cyn, 11-VI-1923, A, and Cucamongo Cyn, 7-IV-1923 (CUAC), and Cucamonga Cr, 22-VI-2004, and East Fork Whitewater R, 13-VII-2004, and Middle Fork Lytle Cr, and West Fork City Cr, 21-VI-2004 (BLAB), and Mill Cr, 17-V-1970, Adams, and Mohave R, 10 km SE Hesperia, 11-IV-1987, Yerlinden, and Waterman Cyn, 3-IV-1976, LaSalle (UCR), whereas

Drunella flavilinea have been identified from: Barton Flats, Barton Cr, 6-VI-2002, and Bear Cr, 28-VI-2001, and City Cr, 11-VI-2002, and Cold Cr, 27-VI-2000, and Deer Cr, 16-V-2002, and Middle Fork Lytle Cr, 19-VI-2002, and Mill Cr, 15-V-2002, and Plunge Cr, 20-VI-2001 (EPA), and Santa Ana R, Running Springs, 19-VII-1999, and South Fork Santa Ana R, Angeles Oaks, 21-VII-1999 (USGS).

Hope this helps you to answer your question, as I am unfamiliar with the geography there.

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