Sweltsa oregonensis (Frison)

Nye, Kelly C. & Stark, Bill P., 2010, A Scanning Electron Microscopy Study Of The Epiprocts Of Western North American Sweltsa (Plecoptera: Chloroperlidae), Illiesia 6 (18), pp. 248-255 : 250

publication ID

https://doi.org/ 10.5281/zenodo.4760011

DOI

https://doi.org/10.5281/zenodo.4759846

persistent identifier

https://treatment.plazi.org/id/207A87A2-551B-FFB5-DC33-8796FB48FDD6

treatment provided by

Felipe

scientific name

Sweltsa oregonensis (Frison)
status

 

Sweltsa oregonensis (Frison) View in CoL

( Figs. 1-6 View Figs )

Alloperla oregonensis Frison, 1935:332 View in CoL .

Holotype ♂ (Illinois Natural History Survey), Oregon, [Clackamas Co.], Salmon River, near Welches, Mt. Hood National Forest

Material examined. OREGON: Deschutes Co.: Deschutes River, Deschutes Bridge Campground, 11 June 2004, B. Stark, R.W. Baumann, 6♂, 8♀ ( BPS). Lincoln Co.: Siletz River, Moonshine Park, 1 June 2000, B. Stark, I. Sivec, M. Zúñiga, 6♂ ( BPS). Marion Co.: North Santiam River, Hwy 22, 3 miles above Idanhas, 3 June 2000, B. Stark, I. Sivec, M. Zúñiga, 2♂ ( BPS). Tillamook Co.: Three Rivers, Castle Rock, Hwy 22, 1 June 2000, B. Stark, I. Sivec, M. Zúñiga, 1♂ ( BPS). WASHINGTON: Clallam Co.: Soleduck River, Hwy 101, 18 June 1967, R.W. Baumann, 1♂, 3♀ ( MLBM). Skamania Co.: Wind River, Paradise Creek Campground, Hwy 30, 14 June 2004, B. Stark, R.W. Baumann, 4♂, 4♀ ( BPS).

Male epiproct. Dorsal length ca. 505-510 µm, basal width ca. 395-409 µm, width at subapical constriction point ca. 256-263 µm. Somewhat spatulate in shape, broad at base ( Figs. 1-2 View Figs ), dorsoventrally flattened, with slightly depressed concavity on dorsal surface, constricted beyond midlength, and usually broadly rounded or upturned at tip. Dorsal surface, except for narrow rim, bearing dense pile of short, setae ( Figs. 3-4 View Figs ); setae appear comb-like with several filaments arising in a common grouping; ventral surface glabrous, at least near tip.

Dorsal process. Located on tergum 9. Total width ca. 300-341 µm, median notch ca. 88-93 µm wide. Process bilobed, lateral lobes truncate to slightly rounded, each ca. 105-124 µm wide, extending above a median U-shaped notch. Dorsal surface smooth on anterior margin but eroded posteriorly ( Figs. 5-6 View Figs ).

Comments. Frison (1935) mentioned the spatulate shape of the epiproct and the mesal cleft of the dorsal process and both Ricker (1943) and Jewett (1959) used the dorsal concavity on the epiproct as an important key character for this species. In their key to Sweltsa species , Stewart & Oswood (2006) note the epiproct shape is broadest basally and upturned and broadly rounded at the tip. The only previous original figures for the epiproct of this species are those in Frison (1935) and Stewart & Oswood (2006); those in Frison (1935) were reproduced in Jewett (1959). Additional comments given below compare this species with S. pacifica .

R

Departamento de Geologia, Universidad de Chile

BPS

California Department of Food and Agriculture

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Plecoptera

Family

Chloroperlidae

Genus

Sweltsa

Loc

Sweltsa oregonensis (Frison)

Nye, Kelly C. & Stark, Bill P. 2010
2010
Loc

Alloperla oregonensis

Frison, T. H. 1935: 332
1935
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