Isoperla quinquepunctata (Banks)

Sandberg, John B., 2011, The Isoperla Of California (Plecoptera: Perlodidae); Larval Descriptions And A Key To 17 Western Nearctic Species, Illiesia 7 (22), pp. 202-258: 241-244

publication ID


persistent identifier

treatment provided by


scientific name

Isoperla quinquepunctata (Banks)


Isoperla quinquepunctata (Banks)  

( Figs. 2m View Figs , 15 View Figs a-h, 20 View Figs m)

Chloroperla quinquepunctata Banks 1902, 34   :124.

Holotype ♀.  

Isoperla quinquepunctata: Szczytko & Stewart 1979   , 32:27-36. ♂, ♀, larva (reared), ovum.

Material examined. CALIFORNIA: Butte Co., Butte Creek, Butte Creek Ecological Reserve , Honey Run Road , 2.9 mi (4.7 km) E intersection with Skyway   , 07/IV/2007, J. Sandberg, ♂; 11/ V /2007   , J. Sandberg, S. Hassur, ♂, Larvae ; 03/IV/2009, J. Sandberg, Larvae   ; 14/III/2010, J. Sandberg, Larvae   ; 27/IV/2010, R   . Baumann, B. Kondratieff, J. Sandberg, ♂; Butte Creek, Hwy 99 bridge, Chico   , 11/ V /2007   , J. Sandberg, S. Hassur, ♀; El Dorado Co., NF Cosumnes River, Sweeney’s , Somerset , 13-21/ VI /1982, R. Bottorff, ♀ ( NMNH); NF Cosumnes River, Hwy 49, Nashville   , 01/ VI /1981, R. Bottorff, ♀ ( NMNH); Napa Co., Capell Creek, 2.1 mi (3.4 km) W Rt 121 on Rt 128   , 20/ VI /1985   , O. Flint, ♂ ♀ ( NMNH); Placer Co., Truckee River, Rt 89, 9 mi (14.5 km) S I-80, 5000 feet (1524m), 19/ VI /1985   , C. & O. Flint, ♂ ♀ ( NMNH); Sacramento Co., Cosumnes River , Michigan Bar, 23/IV/1982, 30/IV/1982, 06/VII/1982, 30/III/1984, 29/IV/1986, R   . Bottorff, ♂ ♀ ( NMNH); Cosumnes River, Sloughhouse   , 04/IV/1982, 13/V/1982, 25/V/1982, 14/VI/1982, R   . Bottorff, ♂ ♀ ( NMNH); Tehama Co., Sacramento River, Near Red Bluff   , 31/III/1965, S. Jewett Jr., ♂ ( NMNH); Tulare Co., Kaweah River?, Near Three Rivers   , 14/ V /1964   , D. Denning, ♂ ♀ ( NMNH); Yuba Co., Yuba River, Hammon Grove Park , Hwy 22, 13 mi (20.9 km) NE Marysville, 07/ V /2010   , J. Sandberg, ♂ ♀, Larvae (reared); Yuba River, Hwy 22 bridge crossing, 16.4 mi (26.4 km) NE Marysville, 02/ V /2010   , J. Sandberg, A. Richards, ♂ ♀, Larvae (reared); 07/ V /2010   , J. Sandberg, ♂ ♀, Larvae (reared); OREGON: Baker Co.,?, Sumpter , on willow   , 19/VII/1971, J. Baker, ♂ ( NMNH); Clatsop Co., Nehalem River, at Red Bluff Rd. , 4 mi (6.4 km) NE Elsie   , 08/ V /1965   , S. Jewett Jr., ♀ ( NMNH); Grant Co.,?, Ritter , 18/VII/1962, Clarke, ♂ ♀ ( NMNH); Klamath Co?.,?, Odell Lake, Cascade Mts , 4760 feet (1451m)   , 16/VII/1948, C. Alexander, ♂ ♀ ( NMNH)   .

Male larva. Body length of mature larva 9–12 mm. Dorsum of head with contrasting pigment pattern and a mixture of fine light and dark clothing setae, anterior frontoclypeus margin unpigmented; light M shaped pattern anterior to median ocellus usually indistinct, not connected to light frontoclypeus area, median light longitudinal light band absent, lateral thin arms faint, directed posterolaterally, extending to antennal bases; posterior ocelli with partially enclosed large light areas along outer lateral margins; interocellar area partially light and variable, either completely enclosed by dark pigment and entirely within the triangle, enclosed by dark pigment and extended posteromedially past posterior ocelli, or connected to posterior margin of head by thin longitudinal light pigment band; occiput with irregular spinulae band extending from below eye to near median epicranial suture, not enclosed completely by dark pigment ( Fig. 15a View Figs ). Lacinia bidentate, total length 696–828 µm ( Figs. 2m View Figs , 15e- h View Figs , Tables 2-4 View Table 2 View Table 3 View Table 4 ); submarginal row (A+B) with 3–4 setae, groups A-B interrupted by gap below subapical tooth ( SAT) inner margin ( Figs. 15 View Figs g-h); 1 submarginal seta (A) inserted at the base apical tooth ( AT) inner margin, plus 1 thin marginal seta ( TMS) adjacent to AT inner margin, sometimes obstructed from view by AT or broken, and 1 dorsal seta (DS) located below SAT inner margin, partially obstructed by SAT ( Figs. 15 View Figs g-h); 2–3 submarginal setae (B) located past SAT inner margin ( Fig. 15h View Figs ); 7–11 marginal setae (C), initially long-stout and widely spaced, last few shorter and widely spaced, blending into and difficult to differentiate from dorsal and ventral surface setae ( Fig. 15e View Figs ); 48–97 ventral surface setae (D) forming dense longitudinal band below submarginal and marginal setae, ending posteriorly at approximately ¾ the inner lacinia margin length, setae closest to inner margin protrude laterally past lacinia margin ( Fig. 15f View Figs ); dorsal surface setae ( DSS) forming dense, laterally protruding, longitudinal band on and along inner-lateral margin, ending before posterior-most ventral surface setae ( Fig. 15f View Figs ). Galea with 23–27 setae in sparse ventral row, apex with 5 setae. Maxillary Palp segments 2–3 with curved, apically pointed setae. Pronotum with median light area occasionally with a short central indistinct brown band bordered by irregular dark pigment markings; discs each with partially to completely enclosed light areas, the largest resembling the “windows” described for I. acula   , fine dark clothing setae and lateral margins with broad light bands ( Fig. 15b View Figs ). Meso and metanotum with contrasting pigment pattern and fine light and dark clothing setae, dark setae enclosed by dark pigment ( Fig. 15c View Figs ). Legs with numerous fine light clothing setae and scattered erect spines on outer surface of femora, erect spines longest and concentrated on dorsal surfaces; fine silky setae numerous and continuous on dorsal surfaces of femora and tibia ( Fig. 20m View Figs ); tibia with at most, a very faint and incomplete band near joint with femora; femora with median, longitudinal light brown pigment band concentrated distally. Abdominal terga with three distinct longitudinal dark stripes; wide light median longitudinal band bisected with variable, thin to thick, dark median longitudinal stripe; lateral pair of dark longitudinal stripes about twice as wide as median dark stripe, nearly extending to lateral margins; numerous fine dark clothing setae and erect spines scattered dorsally; posterior margin with scattered long and numerous short spines in a concentrated row ( Fig. 15d View Figs ).

Distribution. Canada: Alberta, British Columbia and Saskatchewan; USA: California, Colorado, Idaho, Kansas, Montana, Nebraska, New Mexico, Nevada, Oregon, South Dakota, Utah, and Wyoming; Mexico: Baja California. Widely distributed throughout California.

Diagnosis. Mature male I. quinquepunctata   larval pigment patterns are most similar to I. acula   , I. mormona   and I. sordida   ( Figs. 3 View Figs a-d, 12a-d, 15a-d, 18a- d). In California, this species can be differentiated from other species with 1–4 submarginal setae (A+B) by having 48–97 ventral surface (D) setae ( Figs. 15 View Figs eh), pronotal discs patterned with small to large central light areas, when large these areas not completely enclosed by dark pigment ( Fig. 15b View Figs ).

Remarks. When live, larvae of this species possess a distinctive red hue on non-sclerotized membrane. This species was found in large creeks and medium rivers with fast currents and with one or more of the following species: I. pinta   , I. mormona   , I. marmorata   , and I. roguensis   . Emergence occurred in May–June.


Royal British Columbia Museum - Herbarium


Departamento de Geologia, Universidad de Chile


Mykotektet, National Veterinary Institute


Smithsonian Institution, National Museum of Natural History


Angelo State University


Toleco Museum of Health and Natural History














Isoperla quinquepunctata (Banks)

Sandberg, John B. 2011

Chloroperla quinquepunctata

Chloroperla quinquepunctata Banks 1902, 34

Isoperla quinquepunctata: Szczytko & Stewart 1979

Isoperla quinquepunctata: Szczytko & Stewart 1979