identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
C250BC3DFFBCFF9FFE86385AFAEF43F5.text	C250BC3DFFBCFF9FFE86385AFAEF43F5.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Megarcys signata (Hagen 1874)	<div><p>Megarcys signata (Hagen 1874)</p> <p>(Figs. 2-11, 13, 18, 19, 25, 31, 37, 43, 50, 61, 71, 80, 85 a-b, Table 1)</p> <p>Distribution. Rocky Mountains, New Mexico- Nevada northward to British Columbia and Alaska. Material examined. Colorado: Boulder Co., South Boulder Creek, 3.2 km west of Tolland, 7-VII-1991, B. Kondratieff, R. Durfee, 11♂ (both macropterous and brachypterous), 6♀, 11♀ larvae, 2♂ exuviae; Middle St. Vrain Creek, FR 14 west of Peaceful Valley, 17- VII-1993, B. Kondratieff, B. Painter, 1♂, 2♀ larvae; Gunnison Co., Mosquito Creek/confluence Quartz Creek, Colorado Rd. 76 north of Pitkin, 9-VII-2008, K. Stewart, reared series: 2 reared ♂ with exuviae, 1 reared ♀ with exuvium, 8♂ larvae, 14♀ larvae; Larimer Co., outlet stream of Chasm Lake, Rocky Mountain National Park, El. 3536m, 16-VII-1994, B. Kondratieff, R. Durfee, 2 brachypterous ♂ larvae, 1♀ brachypterous larva. Montana: Gallatin Co., 5.63 km off Trail Creek Rd., 10-6-1987, B. Kondratieff, 2♂, 2♂ larvae, 3♀ larvae, 3♂ exuviae, 2♀ exuviae. Wyoming: Teton Co., Granite Creek, Granite Falls, 8-VII-2001, B. VanWieren, 1♀, 2♀ larvae. Yukon Territory: Alaska Hwy., stream crossing between Watson Lake and Whitehorse, V-1997, P. Niblett, 4♂ larvae, 3♀ larvae.</p> <p>Characters. Head capsule width ♂ 3.24-3.48mm, ♀ 4.14-4.20mm; pronotal width ♂ 2.64-2.76mm, ♀ 3.36- 3.90mm; body length ♂ 16.2-18.5mm, ♀ 25-26mm (Table 1). Color and pigmentation (Figs. 2, 3, 13, 19, 25, 43, 50), lacinia (Fig. 21), and dorsomesal band of erect silky white hairs (Figs. 18, 19) typical of genus and as described by Stewart &amp; Stark (1988, 2002). Wingpads of ♂ and ♀ (Figs. 2, 25) macropterous (or brachypterous in high elevation streams). Gill number and arrangement typical of genus (Fig. 61). Submental gill length ♂ 0.36-0.48mm, ♀ 0.54- 0.60mm; anterior supracoxal gill length ♂ 0.36- 0.42mm, ♀ 0.45-0.0.60mm (shorter in high elevation Chasm Lake outlet stream in Rocky Mountain National Park) (Table 1). Legs (Figs. 6, 31) with setation typical of genus as described by Stewart &amp; Stark (2002).Y-arms of mesosternum meet anterior corners of furcal pits (Figs. 7, 8, 37), typical of genus. Cercal segments ♂ 26 (Table 1), as described by Stewart &amp; Stark (2002) with apical whorl of short setae on cercomeres and dorsal fringe of silky white hairs (Fig. 11). Developing membranous, windsocklike posterior process of male epiproct (Fig.71) evident in late instar individuals, and pointed posteroventrally in lateral view (Fig. 80). Developing female subgenital plate of 8 th sternum (Figs. 50, 85) shallowly notched mesally.</p> <p>Comments. The generic characters proposed by Stewart &amp; Stark (1988, 2002) were further confirmed in these additional larvae examined. Color and pigmentation (Figs. 2, 3, 13, 19, 25, 31, 43, 50) were of a generic pattern that was similar in the other four species examined. The measured gill lengths, and shapes, were variable between left and right sides, individuals, and populations, therefore difficult to compare with the generalized terms “short” and “long” as used by Teslenko (2009) in her descriptions and keys to Palearctic species. Submental (SM) gills (Figs. 8, 61) are not visible from dorsal view; anterior supracoxal (ASC) gills and anterior mesothoracic and anterior metathoracic (AT2, AT3) gills (Figs. 8, 61) are “long” and usually visible in dorsal view.</p></div> 	http://treatment.plazi.org/id/C250BC3DFFBCFF9FFE86385AFAEF43F5	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Stewart, Kenneth W.;Kondratieff, Boris C.	Stewart, Kenneth W., Kondratieff, Boris C. (2012): Larvae Of The Nearctic Species Of The Stonefly Genus Megarcys Klapálek (Plecoptera: Perlodidae). Illiesia 8 (3): 16-36, DOI: http://doi.org/10.5281/zenodo.4760667
C250BC3DFFBCFF9CFC0C3D40FDE94119.text	C250BC3DFFBCFF9CFC0C3D40FDE94119.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Megarcys irregularis (Banks 1900)	<div><p>Megarcys irregularis (Banks 1900)</p> <p>(Figs. 12, 24, 30, 36, 42, 48, 60, 70, 84 a-b, Table 1)</p> <p>Distribution. Pacific Northwest; Coastal and Cascade Mountains of Washington, British Columbia.</p> <p>Material examined. Washington: Pierce Co., Fryingpan Creek, Sunrise Road, Mount Rainier National Park, 13-VII-2003, B. Kondratieff, J. Schmidt, 1♂, 2♀ larvae; 14-VII-2004, B. Kondratieff, 5♀; Nisqually River, Longmire, Mount Rainier National Park, 28-V-1997, B. Kondratieff, 2♂, 1♀, 2♂ larvae; White River, Hwy. 410, Mount Rainier National Park, B. Kondratieff, 8♂, 1♀, 3♂ larvae, 3♀ larvae, 1♂ exuvium, 2♀ exuviae; 20-VI-2003, B. Kondratieff, R. Zuellig, J. Schmidt, 2♀.</p> <p>Characters. Head capsule width ♂ 3.06-3.30mm, ♀ 3.90-4.62mm; pronotal width ♂ 2.88-3.12mm, ♀ 3.36- 4.08mm; body length ♂ 18.3-19.5mm, ♀ 19.5-24.0mm (Table 1). Color and pigmentation (Figs. 12, 24, 30, 36, 42, 48), lacinia, and dorsomesal band of erect silky white hairs typical of genus. Wingpads of ♂ and ♀ macropterous. Gill number and arrangement typical of genus (Fig. 70). Submental gill length ♂ 0.12- 0.42mm, ♀ 0.36-0.45mm; anterior supracoxal gill length ♂ 0.27-0.42mm, ♀ 0.36mm (Table 1). Legs (Fig. 30) with setation typical of genus as described by Stewart &amp; Stark (2002).Y-arms of mesosternum (Fig. 36) typical of genus. Cercal segments ♂ 24-26 (Table 1), with setation typical of genus. Developing membranous, windsocklike process of male epiproct (Figs. 42, 48, 70) evident in late instar individuals, and pointed posteroventrally in lateral view (Fig. 79).Developing female subgenital plate of 8 th sternum (Figs. 49, 84a, b) shallowly notched mesally.</p> <p>Comments. The generic characters proposed by Stewart &amp; Stark (2002), based solely on M. signata, are reaffirmed in this species, and color and pigmentation fit the generic pattern illustrated herein for M. signata. The measured gill lengths and shapes were greatly variable in this species (Table 1), and otherwise similar to M. signata.</p> </div>	http://treatment.plazi.org/id/C250BC3DFFBCFF9CFC0C3D40FDE94119	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Stewart, Kenneth W.;Kondratieff, Boris C.	Stewart, Kenneth W., Kondratieff, Boris C. (2012): Larvae Of The Nearctic Species Of The Stonefly Genus Megarcys Klapálek (Plecoptera: Perlodidae). Illiesia 8 (3): 16-36, DOI: http://doi.org/10.5281/zenodo.4760667
C250BC3DFFBFFF97FEBC3C23FE3C40C0.text	C250BC3DFFBFFF97FEBC3C23FE3C40C0.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Megarcys subtruncata Hanson 1942	<div><p>Megarcys subtruncata Hanson 1942</p> <p>(Figs. 14-16, 20, 22, 26-28, 32-34, 38-40, 44-46, 51, 52, 62-64, 72, 81, 86, Table 1)</p> <p>Distribution. California, Pacific Northwest (Oregon, Washington, British Columbia), and Northern Rocky Mountains (Idaho, Montana).</p> <p>Material examined. California: Butte Co., Butte Creek, Cherry Hill Campground, 12-V-2007, J. Sandberg, 1♂, 5 ♂ larvae, 5♀ larvae. Shasta Co., Hat Creek at Hat Creek Lake, Lassen-Volcanic National Park, 6-VII-1979, K. Stewart, B. Stark, 1 reared ♀, 1 pharate ♂ larva (cleared genitalia), 1♀ larva; Hat Creek, Big Pine Camp, 26-IV-1987, B. Stark, R. Baumann, C. Nelson, 1♂ larva. Oregon: Deschutes Co., Quinn River Spring, Quinn River Campground, 10-VI-2004, B. Stark, R. Baumann, 20♂, 13♀, 8♂ larvae, 8♀ larvae. Washington: Lewis Co., Ohanapecosh River, Grove of the Patriarchs, Mount Rainier National Park, 28-V-1997, B. Kondratieff, 1 reared ♂ with exuvium; Ohanapecosh River, Hwy. 123, North Silver Falls, Mount Rainier National Park, 23-V-2003, B. Kondratieff, J. Schmidt, R. Evans, 2♂ larvae, 4♀ larvae; Ohanapecosh River, Hwy. 123, Paradise River above Narada Falls, Mount Rainier National Park, 16-VIII-1999, B. Kondratieff, R. Lechleitner, 1♀, 2 reared ♀ with exuviae, 5 exuviae; Pierce Co., Fish Creek, Westside Road Bridge, Mount Rainier National Park, 21-VI-2003, B. Kondratieff, R. Zuellig, J. Schmidt, 2♂, 1♀, 1♂ exuvium, 2♀ exuviae; Fryingpan Creek, Sunrise Road, Mount Rainier National Park, 16-VIII-1999, B. Kondratieff, 1♂ with exuvium, 1♀ with 2 exuviae; Ipsut Creek at bridge, Mount Rainier National Park, 6-VI-1997, R. Lechleitner, 2♀, 1 exuvium.</p> <p>Characters. Butte Creek, California, macropterous population: Head capsule width ♂ 3.78-3.90mm, ♀ 4.68-4.74mm; pronotal width ♂ 3.36-4.48mm, ♀ 4.20mm; body length ♂ 17.9-21.6mm, ♀ 22.2-25.5mm (Table 1). Color and pigmentation (Figs. 15, 27, 33, 39, 45, 51), lacinia (like Ohanapecosh River, Washington population Fig. 28), and dorsomesal band of erect silky white hairs typical of genus. Wingpads of ♂ (Fig. 27) and ♀ macropterous. Gill number and arrangement typical of genus (Fig. 62). Submental gill length ♂ 0.39-0.54mm, ♀ 0.54- 0.66mm; anterior supracoxal gill length ♂ 0.42- 0.54mm, ♀ 0.54-0.66mm (Table 1). Legs (Fig. 33) with typical setation of genus as described by Stewart &amp; Stark (2002). Y-arms of mesosternum (Fig. 39) typical of genus. Cercal segments ♂ 24-26 (Table 1), with setation typical of genus. Developing membranous windsock-like process of male epiproct (Fig. 72) evident in late instar individuals, and pointed posteroventrally in lateral view (Fig. 81). Developing female subgenital plate of 8 th sternum (Figs. 51, 86) shallowly notched mesally.</p> <p>Quinn Spring, Oregon, brachypterous population: As indicated by Stark &amp; Baumann (2005), larvae of this population, that they did not describe in detail, “agree in most respects” with the generic description in Stewart &amp; Stark (2002). Head capsule width ♂ 3.12-3.48mm, ♀ 4.20-4.22mm; pronotal width ♂ 2.94- 3.12mm, ♀ 4.02-4.26mm; body length ♂ 15.6-16.0mm, ♀ 19.5-21.2mm. Color and pigmentation (Figs. 16, 28, 34, 40, 46), lacinia typical of genus. Dorsomesal band of erect silky white hairs and those along the ecdysial suture of the head absent. Wingpads ♂ (Fig. 28) and female brachypterous. Gill number and arrangement typical of genus. Submental gill (Fig. 63) length ♂ 0.27-0.30mm, ♀ (Fig. 64) 0.34-0.36mm; anterior supracoxal gill length ♂ 0.21-0.24mm, ♀ 0.30-0.34mm (Table 1). Legs (Fig. 34) with typical setation of genus. Y-arms of mesosternum (Fig. 40) typical of genus. Cercal segments of ♂ 22+ (all broken), dorsal silky fringe (typical of the other four species) absent or with a few obscure setae on basal segments. Developing membranous, windsock-like process of male epiproct evident in late instar individuals, and pointed posteroventrally in lateral view like the Butte Creek, California, population (Fig. 81). Developing female subgenital plate of 8 th sternum shallowly notched mesally like the Butte Creek, California, population (Figs. 51, 86).</p> <p>Comments. The Quinn Spring, Oregon, brachypterous population exhibited these substantial character differences from generic and the Butte Creek, California, and Ohanapecosh River, Washington macropterous populations examined: 1) the dorsomesal band of erect silky white hairs and those along the ecdysial suture of the head were absent, 2) the dorsal silky fringe of basal cercal segments was absent or with only a few obscure setae present, 3) the body size (length) of pre-emergent males was on average 20% shorter, and females about 15% shorter (Table 1), 4) submental and anterior supracoxal gills of males (Fig. 63) were on average about 39% and 53% shorter, respectively (Table 1). The gills of the Quinn Spring population could therefore generally be described as “short” in comparison with “long” in the other two populations studied. This suggests that populations of this species in ecotypes may vary in wing length, body and gill size, and setation, but still conform to the diagnostic generic characters of gill arrangement and Y-arms extending to anterior corners of the furcal pits (Stewart &amp; Stark 2002).</p></div> 	http://treatment.plazi.org/id/C250BC3DFFBFFF97FEBC3C23FE3C40C0	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Stewart, Kenneth W.;Kondratieff, Boris C.	Stewart, Kenneth W., Kondratieff, Boris C. (2012): Larvae Of The Nearctic Species Of The Stonefly Genus Megarcys Klapálek (Plecoptera: Perlodidae). Illiesia 8 (3): 16-36, DOI: http://doi.org/10.5281/zenodo.4760667
C250BC3DFFB4FF8AFE893D9BFE0443D8.text	C250BC3DFFB4FF8AFE893D9BFE0443D8.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Megarcys watertoni (Ricker 1952)	<div><p>Megarcys watertoni (Ricker 1952)</p> <p>(Figs. 17, 23, 29, 35, 41, 47, 53, 65-68, 73, 75-77, 82, 87, Table 1)</p> <p>Distribution. Northern Rocky Mountains; Idaho, Montana, Alberta, British Columbia.</p> <p>Material examined. British Columbia: Kooteny National Park, 8-VII-1985, 2♂, 2♀, many exuviae. Montana: Carbon Co., Baring Falls, 28-VII-1989, B. Stark et al., 1♀ larva; Rock Creek, 0.8 km below Glacier Lake Trailhead, 22-VII-1989, B. Stark, 1 brachypterous ♂ (to Ab9), 1 brachypterous ♂ (to Ab 5), 4♀, 1♀ larva; Glacier Co., Baring Creek, Sunrift Gorge, Glacier National Park, 22-VII-1979, K. Stewart, R. Baumann, B. Stark, 4♂ larvae, 5♀ larvae; Iceberg Creek at Iceberg Lake, Glacier National Park, 29-VII-1969, R. Haick, 2 brachypterous ♂, 1♀; 3-VII- 1972, J. Stanford, 3♂ larvae, 1♀ larva; 21-VII-1979, K. Stewart, R. Baumann, B. Stark, 1♂ larva, 1♀ larva; Roes Creek, Rising Sun Campground, Glacier National Park, 6-VII-1963, coll.?, 3♂, 3♀; Flathead Co., Bear Creek / jct. Middle Fork Flathead River, Hwy. 2, 7-VI-1996, R. Hansen, B. Ward (C. Nelson # 6347), 1♂ larva, 1♀ larva; Juliet Creek, Bob Marshall Wilderness, 19-VII-1981, J. Stanford, 1♀; Lion Creek, 14-VII-1985, K. Stewart, 4♂ larvae, 4♀ larvae; Logan Creek at Logan Pass, Glacier National Park, 11-VII- 1987, K. Stewart, 1♂ larva; 2100 m, 10-X-1991, J. Giersch, 5 small larvae; Logan Creek /confluence McDonald Creek, Glacier National Park, 29-VI-1995, J. Giersch, 2♂, 1♀; Spotted Bear River at Pentagon, Bob Marshall Wilderness, 21-VII-1981, J. Stanford, 1♂ larva.</p> <p>Characters. Bear Creek, Montana, macropterous population: Head capsule width ♂ 3.72mm, ♀ 4.32- 4.38mm; pronotal width ♂ 3.00mm, ♀ 3.90mm; body length ♂ 20.4, ♀ 24.3mm (Table 1). Color and pigmentation, lacinia, and dorsomesal band of erect white hairs similar to Iceberg Creek, Montana, population (described below) (Figs. 17, 23, 29, 35, 41, 47, 53). Wingpads of ♂ (Fig. 76) and ♀ macropterous. Gill number and arrangement typical of genus. Submental gill (Fig. 66) length ♂ 0.54-0.57mm, ♀ 0.66-0.72mm; anterior supracoxal gill (Fig. 67) length ♂ 0.36mm, ♀ (Fig. 68) 0.60-0.66mm (Table 1). Legs with typical setation of genus as described by Stewart &amp; Stark (2002). Y-arms of mesosternum typical of genus. Cercal segments ♂ 26 (Table 1), with setation typical of genus. Developing membranous windsock-like process of male epiproct evident in late instar individuals, and pointed posteroventrally in lateral view like the Iceberg Creek, Montana, population below (Figs. 73, 82). Developing female subgenital plate of 8 th sternum shallowly notched mesally like Glacier Creek population below (Fig. 87).</p> <p>Iceberg Creek, Montana, male brachypterous (female macropterous) population: Head capsule width ♂ 2.76-3.00mm, ♀ 3.48-3.84mm; pronotal width ♂ 2.58-2.64mm, ♀ 3.36mm; body length ♂ 16.08-17.28mm, ♀ 20.9-22.2mm (Table 1). Color and pigmentation (Figs, 17, 29, 35, 41, 47, 53), lacinia, (Fig. 23), and dorsomesal band of erect silky white hairs typical of genus. Wingpads ♂ (Fig. 75) brachypterous, ♀ (Fig. 29) macropterous. Gill number and arrangement (Fig. 65) typical of genus. Submental gill length ♂ 0.24-0.27mm, ♀ 0.36- 0.39mm; anterior supracoxal gill length ♂ 0.24- 0.27mm, ♀ 0.33-0.42mm (Table 1. Legs (Fig. 35) with typical setation of genus. Y-arms of mesosternum (Fig. 41) typical of genus. Cercal segments ♂ 26 (Table 1), with setation typical of genus. Developing membranous windsock-like process of male epiproct (Fig. 73) evident in late instar individuals, and pointed posteroventrally in lateral view (Fig. 82). Developing female subgenital plate of 8 th sternum (Fig. 87) shallowly notched mesally.</p> <p>Comments. The high elevation Iceberg Creek population was similar in color and pigmentation, and other generic characters, to the lower elevation Bear Creek population, except for male brachyptery and smaller body and gill sizes. Head capsule widths of males and females were on average 21.4% and 17.8%, respectively, smaller; pronotal widths of males and females were on average 13.0% and 13.8% smaller, and body lengths were on average 10.0% and 11.4% smaller (Table 1). Gill lengths were substantially smaller; submental gills of males and females were on average 54.1% and 45.7% shorter; anterior supracoxal gills of males and females were on average 29.2% and 40.5% shorter, respectively (Table 1).</p></div> 	http://treatment.plazi.org/id/C250BC3DFFB4FF8AFE893D9BFE0443D8	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Stewart, Kenneth W.;Kondratieff, Boris C.	Stewart, Kenneth W., Kondratieff, Boris C. (2012): Larvae Of The Nearctic Species Of The Stonefly Genus Megarcys Klapálek (Plecoptera: Perlodidae). Illiesia 8 (3): 16-36, DOI: http://doi.org/10.5281/zenodo.4760667
C250BC3DFFA9FF8AFF6D3D63FB4D4172.text	C250BC3DFFA9FF8AFF6D3D63FB4D4172.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Megarcys yosemite (Needham & Claassen 1925)	<div><p>Megarcys yosemite (Needham &amp; Claassen 1925)</p> <p>(Figs. 1, 54-59, 69, 74, 78, 83, 88 a-b, Table 1)</p> <p>Distribution. California, Washington (high elevation streams).</p> <p>Material examined. California: Inyo Co., Ruby Creek, about 56.33km from the <a href="http://tb.plazi.org/GgServer/search?materialsCitation.longitude=-118.98797&amp;materialsCitation.latitude=37.574276" title="Search Plazi for locations around (long -118.98797/lat 37.574276)">Mt. Lyell</a> Type Locality, El. 3444m, water temp. 12.2°C, 20-VIII- 2010, L. Serpa, 1 pre-emergent ♂ larva (died in rearing), 4 early instar larvae (on a previous date in 2008, 1♂ determined by R. Baumann, and 1♀ larva, were collected by L. Serpa at this site; personal correspondence); <a href="http://tb.plazi.org/GgServer/search?materialsCitation.longitude=-118.98797&amp;materialsCitation.latitude=37.574276" title="Search Plazi for locations around (long -118.98797/lat 37.574276)">Mono Co.</a>, <a href="http://tb.plazi.org/GgServer/search?materialsCitation.longitude=-118.98797&amp;materialsCitation.latitude=37.574276" title="Search Plazi for locations around (long -118.98797/lat 37.574276)">Coldwater Creek</a>, 37°34 ’ 27.4 ’’ N 118° 59 ’ 16.7 ’’ W, El. 3063m, water temp. 4.44°C, 19-VIII-2010, L. Serpa, 2 reared brachypterous ♂ (one ♂ determined by R.W. Baumann), 2 brachypterous ♂ larvae, 4 brachypterous ♀ larvae, 6 early instar larvae with average head capsule width of 1.14mm, and average body length of 5.64mm; Coldwater Creek, Sky Meadow, 2.7km above Coldwater Creek Campground, El. 3067m, water temp. 4.49°C, 2 reared ♂, 1 reared ♀ (Fig. 1), 6 larvae (5 died in rearing: 07-IX-2010 collection date, 17-IX- 2010 emergence date) (personal correspondence, J. Sandberg).</p> <p>Characters. Head capsule width ♂ 2.88-3.36mm, ♀ 3.60-3.84mm; pronotal width ♂ 2.76-3.30mm, ♀ 3.54-3.66mm; body length ♂ 17.64-20.2mm, ♀ 22.4- 22.9mm (Table 1). Color and pigmentation (Figs. 54- 59), lacinia, and dorsomesal band of erect silky white hairs typical of genus. Wingpads of ♂ (Figs. 55, 78) and ♀ brachypterous, reflective of adults. Gill number and arrangement typical of genus (Fig. 69). Submental gill length ♂ 0.27-0.36mm, ♀ 0.33- 0.45mm; anterior supracoxal gill length ♂ 0.18- 0.30mm, ♀ 0.24-0.33mm (Table 1). Legs (Fig. 56) with setation typical of genus. Y-arms of mesosternum (Fig. 57) typical of genus. Cercal segments ♂ 24-26 (Table 1), with setation typical of genus. Developing membranous windsock-like process of male epiproct (Figs. 59, 74) evident in late instar individuals, and pointed posteroventrally in lateral view (Fig. 83). Developing female subgenital plate of 8 th sternum (Fig. 88a, b) shallowly notched mesally.</p> <p>Comments. Males and females (Fig. 1) of this high elevation California population are brachypterous, reflected by the very short wingpads of preemergent larvae. The submental and anterior supracoxal gill lengths of both sexes of larvae, like the brachypterous male larvae of M. subtruncata larvae of Quinn Spring, Oregon, and brachypterous male and macropterous female larvae of M. watertoni from Iceberg Creek, Montana, were substantially shorter than those of the macropterous populations studied (Table 1). Otherwise, coloration and pigmentation, generic, and other specific characters of larvae were not separable from the other four species.</p> </div>	http://treatment.plazi.org/id/C250BC3DFFA9FF8AFF6D3D63FB4D4172	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Stewart, Kenneth W.;Kondratieff, Boris C.	Stewart, Kenneth W., Kondratieff, Boris C. (2012): Larvae Of The Nearctic Species Of The Stonefly Genus Megarcys Klapálek (Plecoptera: Perlodidae). Illiesia 8 (3): 16-36, DOI: http://doi.org/10.5281/zenodo.4760667
