Megarcys yosemite
Creators: name: Stewart, Kenneth W.
name: Kondratieff, Boris C.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlodidae
Megarcys
Megarcys yosemite

description: <i>Megarcys yosemite</i> (Needham &amp; Claassen 1925) (Figs. 1, 54-59, 69, 74, 78, 83, 88 a-b, Table 1) <b>Distribution.</b> California, Washington (high elevation streams). <b>Material examined.</b> California: Inyo Co., Ruby Creek, about 56.33km from the Mt. Lyell Type Locality, El. 3444m, water temp. 12.2°C, 20-VIII- 2010, L. Serpa, 1 pre-emergent &amp;male; larva (died in rearing), 4 early instar larvae (on a previous date in 2008, 1&amp;male; determined by R. Baumann, and 1&amp;female; larva, were collected by L. Serpa at this site; personal correspondence); Mono Co., Coldwater Creek, 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 &amp;male; (one &amp;male; determined by R.W. Baumann), 2 brachypterous &amp;male; larvae, 4 brachypterous &amp;female; 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 &amp;male;, 1 reared &amp;female; (Fig. 1), 6 larvae (5 died in rearing: 07-IX-2010 collection date, 17-IX- 2010 emergence date) (personal correspondence, J. Sandberg). <b>Characters.</b> Head capsule width &amp;male; 2.88-3.36mm, &amp;female; 3.60-3.84mm; pronotal width &amp;male; 2.76-3.30mm, &amp;female; 3.54-3.66mm; body length &amp;male; 17.64-20.2mm, &amp;female; 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 &amp;male; (Figs. 55, 78) and &amp;female; brachypterous, reflective of adults. Gill number and arrangement typical of genus (Fig. 69). Submental gill length &amp;male; 0.27-0.36mm, &amp;female; 0.33- 0.45mm; anterior supracoxal gill length &amp;male; 0.18- 0.30mm, &amp;female; 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 &amp;male; 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. <b>Comments.</b> 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 <i>M. subtruncata</i> larvae of Quinn Spring, Oregon, and brachypterous male and macropterous female larvae of <i>M. watertoni</i> 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.
description: Published as part of <i>Stewart, Kenneth W. &amp; Kondratieff, Boris C., 2012, Larvae Of The Nearctic Species Of The Stonefly Genus Megarcys Klapálek (Plecoptera: Perlodidae), pp. 16-36 in Illiesia 8 (3)</i> on page 33, DOI: 10.5281/zenodo.4760667
description: {"references": ["Needham, J. W. &amp; P. W. Claassen. 1925. A monograph of the Plecoptera or stoneflies of America North of Mexico, The Thomas Say Foundation, II: 1 - 397."]}