Sweltsa occidens
Creators: name: Kondratieff, Boris C.
name: Baumann, Richard W.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Chloroperlidae
Sweltsa
Sweltsa occidens

description: <i>Sweltsa occidens</i> (Frison) (Figs. 10-17) <i>Alloperla occidens</i> Frison 1937: 96. Holotype &amp;male;, Illinois Natural History Survey: Razorhone Creek, Shucksan (sic) [Shuksan](Whatcom Co.), Washington. <b>Material examined.</b> <b>USA</b>: Alaska: Pullen Creek, Skagway, 14 July 2002, K.T. Huntzinger, 1 &amp;male; (BYUC). Oregon: Clackamas Co., Mt. Hood, 3 mi below Timberline Lodge, 12 July 1979, B.P. Stark and K.W. Stewart, 1 &amp;female; (BPSC). Washington: Chelan Co. Minotaur Creek, 10 mi. W Wenatchee Lake, 14 July 1976, J.R. Wood, 7 &amp;male;, 8 &amp;female; (BYUC); 21 July 1976, 2 &amp;male;, 3 &amp;female; (BYUC); 4 August 1976, 3 &amp;male;, 5 &amp;female; (BYUC); Lewis Co., Laughingwater Creek, 27 June 1995, E. Lisowski, 5 &amp;male; (CSUC); Falls Creek, Stevens Canyon Road, 25 June 2000, R. Lechleitner, 1 &amp;male; (CSUC); Panther Creek, 9 June 2001, R. Lechleitner, 1 &amp;male; (CSUC); Pierce Co., Paradise River, Fourth Crossing, Valley Road., 16 August 1999, B. Kondratieff, 1 &amp;male; (CSUC); 23 July 2000, R. Lechleitner, 2 &amp;male;, 1 &amp;female; (CSUC); Meadow Creek, Mt. Rainier National Park, 14 July 1979, B.P. Stark and K.W. Stewart, 1 &amp;male; (BPSC); St. Andrews Creek, Westside Road, 24 July 1997, R. Lechleitner, 7 &amp;male;, 25 &amp;female; (BYUC, CSUC); Skamania Co, small creek, N Twin Fall Creek, 30 July 1983, G.R. Fiala, 1 &amp;female; (BYUC); Snohomish Co., Crystal Creek, 1.6 mi. up FR 27 off FR 23, 11 mi. SE Darrington, 9 June 1994, G. Mackenzie, 1 &amp;male;, 1 &amp;female; (BYUC); Whatcom Co., Big Face Creek, E Ross Lake, 1 mi. SE of Joker Mountain, 8 August 1966, K.E. Vander Mey, 3 &amp;male;, 12 &amp;female; (BYUC); Swamp Creek, 7 August 1966, K.E. Vander Mey, 1 &amp;male;, 1 &amp;female; (BYUC). <b>Male.</b> General color yellow in life, head with dark ocellar rings, pronotum yellow, but with dark lateral margins, black stripe running down terga 1-8, terminal mark on tergum 8 longer than wide and never divided. Tergum 9 lacking bare elevated process (Fig. 10). Epiproct erectile, elongate, in dorsal view, tapered to apex (Fig. 10); extreme apex bare, (Figs. 10-13), in lateral aspect, apex expanded ventrally, but generally flattened laterally (Figs. 12 &amp; 13); dorsal and lateral surface of epiproct covered with dense pile of long appressed setae, extending to the epiproct base (Figs. 10-13), laterally, base bare (Fig. 12). Aedeagus tubular, constricted near upper &amp;frac13;, with two bulbous lobes, bearing two smaller apical projections (Figs. 14 &amp; 15), more expanded apex with broad lobes and dorsal finger-like projection medially (Fig. 16), surface with comb-like setae arranged in interrupted rows, with patch of stronger setae located at base of constricted area (Figs. 16 &amp; 17). <b>Female.</b> Color and markings similar to male. Subgenital plate subtriangular and not covering all of sternum 9, apex more narrowly rounded, often exhibiting a shallow emarginate area at the tip, but the posterior margin is usually entire (Fig. 27) for <i>S. durfeei</i>.
description: Published as part of <i>Kondratieff, Boris C. &amp; Baumann, Richard W., 2009, A Contribution To The Knowledge Of Sweltsa Exquisita (Frison) And S. Occidens (Frison) And Description Of A New Species Of Sweltsa From The Northern Rocky Mountains, U. S. A. (Plecoptera: Chloroperlidae), pp. 20-29 in Illiesia 5 (3)</i> on pages 24-26, DOI: 10.5281/zenodo.4759034
description: {"references": ["Frison, T. H. 1937. Descriptions of Plecoptera, with special reference to the Illinois species. Bulletin of the Illinois Natural History Survey, 21: 78 - 99"]}