Mayflies, Stoneflies and Caddisflies
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Pteronarcidae:    (cast skin)                       Pteronarcys dorsata
Potomac River
Frederick County, Maryland
April 10, 2004
Photographer:  Richard Orr
STONEFLIES:  PLECOPTERA
CADDISFLIES: TRICOPTERA
Hydropsychidae:                                       Macronema zebratum
Potomac River
Frederick County, Maryland
May 29, 2004
Photographer:  Richard Orr
Taeniopterygidae:                                          Taeniopteryx sp. (adult)
Cunningham Falls State Park
Frederick County, Maryland
March 22, 2007
Photographer:  Richard Orr
MAYFLIES:  EPHEMEROPTERA
Ephemerellidae    (larva)                               Eurylophella sp.
Bear Branch, Sugarloaf Mountain
Frederick County, Maryland
March 31, 2007
Photographer:  Richard Orr
Perlidae     (larva)                                           Eccoptura xanthenes
Bear Branch, Sugarloaf Mountain
Frederick County, Maryland
March 31, 2007
Photographer:  Richard Orr
Ephemeridae    (larvae)                                Ephemera guttulata
Cunningham Falls State Park
Hauver Branch
Frederick County, Maryland
April 22, 2007
Photographer:  Richard Orr
Heptageniidae (subimago adult)               Stenonema (Maccaffertium) vicarium (female)
Cunningham Falls State Park
Big Hunting Creek
Frederick County, Maryland
May 6, 2007
Photographer:  Richard Orr
Pteronarcidae:                                                Pteronarcys biloba (male)
Little Hunting Creek
Cunningham Falls State Park
Frederick County, Maryland
May 27, 2007
Photographer:  Richard Orr
Chloroperlidae:                                               Sweltsa onkos
Little Hunting Creek
Cunningham Falls State Park
Frederick County, Maryland
May 27, 2007
Photographer:  Richard Orr
Brachycentridae:                                      Brachycentrus nigrosoma
Potomac River
Washington County, Maryland
April 16, 2008
Photographer:  Richard Orr
Leptoceridae:                                            Mystacides sepulchralis
David Force Park
Howard County, Maryland
September 4, 2010
Photographer:  Bonnie Ott
Perlidae                                                           Paragnetina media (male)
Casselman River
Garrett County, Maryland
May 31, 2011
Photographer:  Richard Orr
Nemouridae:                                                   Prostoia sp. either similis or completa
Big Hunting Creek
Frederick County, Maryland
April 17, 2012
Photographer:  Richard Orr
Philopotamidae: (net of Larva)              Genus not known
Sideling Hill Creek
Washington County, Maryland
June 17, 2012
Photographer:  Richard Orr
Limnephilidae                                            Pycnopsyche subfasciata
Potomac River at Fort Frederick State Park
Washington County, Maryland
September 17, 2013
Photographer:  Richard Orr
Pteronarcidae:                                               Pteronarcys dorsata
Potomac River
Frederick County, Maryland
April 21, 2014
Photographer:  Richard Orr
Ephemeridae  (subimago adult)                 Hexagenia limbata
St. Mary's Lake
St. Mary's County, Maryland
July 12, 2015
Photographer:  Richrd Orr
Capniidae: Eastern Snowfly                         Allocapnia recta
Mt. Pleasant, Howard County Conservancy
Howard County, Maryland
December 27, 2015
Photographer:  Richard Orr
Heptageniidae (subimago adult)                Hexapgena limbata
St. Mary's Lake
St. Mary's County, Maryland
July 12, 2015
Photographer:  Richard Orr
Nemouridae:                                                   Prostoia similis
Henryton Tributary, Patapsco Valley State Park
Howard County, Maryland
March 7, 2016
Photographer:  Richard Orr
Taeniopterygidae:                                          Oemopteryx contorta
Fishing Creek, Catoctin Mountains
Frederick County, Maryland
March 10, 2016
Photographer:  Richard Orr
Baetiscidae (cast skin)                                Baetisca sp.
Henryton Branch, Patapsco Valley State Park
Howard County, Maryland
May 31, 2016
Photographer:  Richard Orr