taxonID	type	description	language	source
2373BB7A3F7E3F0D8C7A1B7FFAA1F20E.taxon	description	(Figs. 1 ‐ 16, 33)	en	Baumann, Richard W., Lee, Jonathan J. (2009): Two Interesting New Species Of Isoperla From Northern California (Plecoptera: Perlodidae). Illiesia 5 (1): 1-10, DOI: http://doi.org/10.5281/zenodo.4758990
2373BB7A3F7E3F0D8C7A1B7FFAA1F20E.taxon	materials_examined	Material examined. Holotype ♂ from California, Humboldt Co., Dragsaw Spring @ Rd 13 N 01, 23 ‐ VIII‐ 07, J. J. Lee. Paratypes (J. J. Lee, Collector): – California, Humboldt Co., Red Mountain Ck. @ Rd 10 N 12, 4 ‐ VIII‐ 05, 1 ♀; 10 ‐ VIII‐ 05, 1 ♀; 20 ‐ X‐ 05, 1 ♀; 14 ‐ XII‐ 05, 9 larvae; 23 ‐ VI‐ 06, 3 ♀; 3 ‐ VII‐ 06, 2 ♀; 25 ‐ VIII‐ 06, 6 ♂, 1 ♀, 4 larvae; 25 ‐ VII‐ 07, 1 ♀, 2 larvae, 1 ♂ (reared 9 ‐ VIII‐ 07); 8 ‐ VIII‐ 07, 1 ♂, 1 larva; 23 ‐ VIII‐ 07, 1 ♀, 1 ♂ & 1 ♀ (reared 26 ‐ VIII‐ 07), 1 ♂ (reared 27 ‐ VIII‐ 07), 1 ♀ (reared 28 ‐ VIII‐ 07); 29 ‐ VIII‐ 07, 1 larva; 11 ‐ VIII‐ 08, 3 larvae, 1 ♀ (reared 29 ‐ VIII‐ 08); Dragsaw Spring @ Rd 13 N 01, 25 ‐ VII‐ 07, 1 ♂, 1 ♀; 29 ‐ VIII‐ 07, 1 ♀; 11 ‐ VIII‐ 08, 1 ♀; 28 ‐ VIII‐ 08, 1 ♂; spring east of Boise Ck., Hwy. 299, 21 ‐ III‐ 07, 1 larva; spring @ East Fork Willow Creek Campground, 3 ‐ VII‐ 07, 1 ♂; 10 ‐ VII‐ 07, 1 ♂, 1 ♀; 28 ‐ V‐ 08, 1 ♀; 9 ‐ VI‐ 08, 2 larvae. Holotype deposited at the California Academy of Sciences.	en	Baumann, Richard W., Lee, Jonathan J. (2009): Two Interesting New Species Of Isoperla From Northern California (Plecoptera: Perlodidae). Illiesia 5 (1): 1-10, DOI: http://doi.org/10.5281/zenodo.4758990
2373BB7A3F7E3F0D8C7A1B7FFAA1F20E.taxon	description	Male. Macropterous. Length of forewings 10.0 ‐ 11.0 mm; length of body 9.0 ‐ 10.0 mm. General body color golden yellow. Head yellow, light U‐ shaped pattern forward of anterior ocellus, orange brown patch inside “ U ” extends to frontal margin; interocellar area light orange brown; occiput orange brown mesally behind lateral ocelli, occipital suture lines light; posterior corners behind eyes with brown rugose patch and scattered short spinules. Antennae yellow at base, infuscate distally. Pronotum widest anteriorly, with narrow band of light brown rugosities lateral to median, yellow stripe. Wings slightly hyaline yellow, veins brown, and fumose yellow in costal space. Legs yellow, covered with short spines, tibiae with incomplete dorsal brown band in proximal one‐ fourth. Abdomen bright yellow, vesicle on eighth sternum yellow orange, with scattered short setae, longer setae on posterolateral margins, shallowly rounded posteriorly and appearing oval, width approximately 1.5 to 2 times length. Tenth tergum with posteromedian depression and anteromedian unsclerotized area. Cerci golden brown with scattered short setae, one or two ventral setae approaching 1 / 2 segment length distally on each segment. Paraprocts bluntly pointed, curving slightly over tergum 10 (Fig. 9). Aedeagus (Figs. 1, 3 ‐ 4) with an elliptical‐ shaped patch of stout, brown spinules, located dorsally, patch ranging from 2 to 3 times as long as wide (Figs. 2 & 5); posterobasal patch of short stout, orange brown spinules, forming sinuate rows (Fig. 6); a stronger patch of posteromedial orange brown spinules (Fig. 7) becoming smaller and scattered laterally; aedeagus narrowing apically, cleft at apex, with a short, digitate, lightly sclerotized process arising from cleft (Figs. 4 & 8). Female. Macropterous. Length of forewings 11.5 ‐ 12.5 mm; length of body 10.0 ‐ 11.0 mm. General body color, head and pronotal pigmentation patterns similar to male. Subgenital plate broadly triangular but rounded apically, extending at least over one‐ half length of ninth sternum (Fig. 10). Egg. Shape nearly triangular in cross section, short and angular, with five nearly equal sides (Figs. 15 ‐ 16). Collar poorly developed and appearing as a flattened cap. Chorion with thick ridges interspersed with deep angular depressions that cover the remainder of the outer surface. Micropyles set on ridges near bottom third of egg. Mature eggs light brown and almost translucent, appearing like small jewels in preserved specimens. Larva. Body length of mature nymph 9.0 ‐ 10.0 mm. General body color brown, with dark clothing hairs. Dorsum of head brown, light M‐ shaped pattern forward of median ocellus, frontal margin pale, small oval, light patch between frontal pale band and peaks of “ M ” pattern, similar light patch between median ocellus and compound eyes; interocellar area brown, occiput with light, oval patch adjacent to eyes; light patch posteriorly on occiput broken by dark reticulate lines; sinuate band of occipital spinules separating the two light patches; posterior corners behind compound eyes brown with scattered spinules (Fig. 33). Antennae light brown with apical circlets of short setae; dark clothing hairs on basal segments. Lacinia triangular, bidentate; subapical tooth ca. 1 / 2 length of apical tooth; 1 or 2 axillary setae, 6 ‐ 8 stout marginal setae below subapical tooth, setae 7 and / or 8 small; 2 fine submarginal setae below subapical tooth; sparse, irregularly spaced fine marginal and submarginal setae below stout marginal setae (Figs. 13 ‐ 14). Mandibles with 6 cusps in 2 groups of 3; at least middle cusp in each group serrate; median row of long medium stout setae below outer apical cusp to near mandibular base; inner marginal fringe of 40 + long stout setae; right mandible with row of short stout setae below inner 3 rd apical cusp (Fig. 11), setae longer and row more extensive on left mandible. Pronotum oval, width slightly narrower than head, brown with reticulate light markings and dark brown border, slightly lighter brown laterally; margin fringed with small stout setae, occasionally longer setae at upper and lower angles and lateral margin. Meso and metanota brown with reticulate markings. Legs light brown with scattered variable sized stout setae, with sparse dorsal fringe of silky setae (Fig. 33). Thoracic sterna with distinct mesal sclera with dark clothing hairs; mesosternal Y‐ ridge arms extend to posterior corners of furcal pits; with band of erect bristles scattered across anterior surface of mesosternum. Abdominal segments dark brown; terga with paired mesal and lateral light spots; sometimes a third light spot evident forming a mesal triangle with anteromedial pair; lateral light spots often obscured posterior to first few tergites. Cerci with ca. 28 segments; each with posterior circlet of setae, lacking setal fringe. Etymology. We are proud to name this species in honor of our friend, teacher, and colleague David R. Lauck, who taught for many years at Humboldt State University in Arcata, California. He instilled in us the excitement and desire to study the stonefly fauna of the Willow Creek area and the greater TrinityKlamath River drainage. Humboldt Stripetail is suggested as the common name. Diagnosis. This species is unique among described western Isoperla. Adults in the field can be recognized by the golden yellow color, superficially resembling robust Sweltsa. Males can be distinguished by the oval patch of strong spinules dorsally on the aedeagus and the unique lightly sclerotized digitate apical process (Figs. 1 ‐ 4). Nymphs can be distinguished from other western Isoperla species by the presence of an M‐ shaped pattern on the head, the lack of abdominal striping (Fig. 33), and the erect bristles anteriorly on the mesosternum. Erect bristles are evident in early instars but may be worn off in mature later instars. Nymphs superficially resemble small Chernokrilus misnomus (Claassen) and Calliperla luctuosa (Banks), however, the small size of late instars, combination of lack of abdominal striping and mesosternal “ Y ” ‐ arms meeting the posterior corners of the furcal pits, and erect mesosternal bristles distinguishes them. Females have a rounded subgenital plate that extends over half of sternum nine (Fig. 10). The eggs have a distinctive angular shape, with five nearly equal sides (Figs. 15 ‐ 16). Remarks. This species was found in small, perennial spring creeks between 400 and 900 meters elevation. Summer water temperatures ranged from 8 ° C to 12 ° C, summer air temperature regularly exceeded 27 ° C. Females with mature eggs were found from June to October indicating an extended emergence. Early instar nymphs were collected in December; mid to late instar nymphs in March through August, suggesting a univoltine life cycle. Other Perlodidae found with I. laucki include: C. luctuosa, C. misnomus, and Salmoperla sylvanica Baumann & Lauck. “ Drumming ” behavior was observed in one male specimen. A laboratory reared female was placed in a container with a field caught male. After approximately 25 hours the female came out of hiding and mating occurred within 15 minutes. The male was observed to touch his vesicle to the substrate 3 to 5 times then raise his abdomen above horizontal and vibrate it before rapidly bringing it back down. This apparent “ tremulation ” has not been previously reported for Isoperla (Stewart 2001) and further investigation is warranted.	en	Baumann, Richard W., Lee, Jonathan J. (2009): Two Interesting New Species Of Isoperla From Northern California (Plecoptera: Perlodidae). Illiesia 5 (1): 1-10, DOI: http://doi.org/10.5281/zenodo.4758990
2373BB7A3F7E3F0D8C7A1B7FFAA1F20E.taxon	etymology	Etymology. We are proud to name this species in honor of our friend, teacher, and colleague David R. Lauck, who taught for many years at Humboldt State University in Arcata, California. He instilled in us the excitement and desire to study the stonefly fauna of the Willow Creek area and the greater TrinityKlamath River drainage. Humboldt Stripetail is suggested as the common name.	en	Baumann, Richard W., Lee, Jonathan J. (2009): Two Interesting New Species Of Isoperla From Northern California (Plecoptera: Perlodidae). Illiesia 5 (1): 1-10, DOI: http://doi.org/10.5281/zenodo.4758990
2373BB7A3F7E3F0D8C7A1B7FFAA1F20E.taxon	diagnosis	Diagnosis. This species is unique among described western Isoperla. Adults in the field can be recognized by the golden yellow color, superficially resembling robust Sweltsa. Males can be distinguished by the oval patch of strong spinules dorsally on the aedeagus and the unique lightly sclerotized digitate apical process (Figs. 1 ‐ 4). Nymphs can be distinguished from other western Isoperla species by the presence of an M‐ shaped pattern on the head, the lack of abdominal striping (Fig. 33), and the erect bristles anteriorly on the mesosternum. Erect bristles are evident in early instars but may be worn off in mature later instars. Nymphs superficially resemble small Chernokrilus misnomus (Claassen) and Calliperla luctuosa (Banks), however, the small size of late instars, combination of lack of abdominal striping and mesosternal “ Y ” ‐ arms meeting the posterior corners of the furcal pits, and erect mesosternal bristles distinguishes them. Females have a rounded subgenital plate that extends over half of sternum nine (Fig. 10). The eggs have a distinctive angular shape, with five nearly equal sides (Figs. 15 ‐ 16).	en	Baumann, Richard W., Lee, Jonathan J. (2009): Two Interesting New Species Of Isoperla From Northern California (Plecoptera: Perlodidae). Illiesia 5 (1): 1-10, DOI: http://doi.org/10.5281/zenodo.4758990
2373BB7A3F7E3F0D8C7A1B7FFAA1F20E.taxon	discussion	Remarks. This species was found in small, perennial spring creeks between 400 and 900 meters elevation. Summer water temperatures ranged from 8 ° C to 12 ° C, summer air temperature regularly exceeded 27 ° C. Females with mature eggs were found from June to October indicating an extended emergence. Early instar nymphs were collected in December; mid to late instar nymphs in March through August, suggesting a univoltine life cycle. Other Perlodidae found with I. laucki include: C. luctuosa, C. misnomus, and Salmoperla sylvanica Baumann & Lauck. “ Drumming ” behavior was observed in one male specimen. A laboratory reared female was placed in a container with a field caught male. After approximately 25 hours the female came out of hiding and mating occurred within 15 minutes. The male was observed to touch his vesicle to the substrate 3 to 5 times then raise his abdomen above horizontal and vibrate it before rapidly bringing it back down. This apparent “ tremulation ” has not been previously reported for Isoperla (Stewart 2001) and further investigation is warranted.	en	Baumann, Richard W., Lee, Jonathan J. (2009): Two Interesting New Species Of Isoperla From Northern California (Plecoptera: Perlodidae). Illiesia 5 (1): 1-10, DOI: http://doi.org/10.5281/zenodo.4758990
2373BB7A3F7B3F018EFE1C22FE5EF250.taxon	description	(Figs. 17 ‐ 32)	en	Baumann, Richard W., Lee, Jonathan J. (2009): Two Interesting New Species Of Isoperla From Northern California (Plecoptera: Perlodidae). Illiesia 5 (1): 1-10, DOI: http://doi.org/10.5281/zenodo.4758990
2373BB7A3F7B3F018EFE1C22FE5EF250.taxon	materials_examined	Material examined. Holotype ♂ from California, Humboldt County, Klamath River @ junction of Aikens Creek, 29 ‐ III‐ 06, J. J. Lee. Paratypes (J. J. Lee, collector): ‐ California, Humboldt Co., same data as holotype, 29 ‐ III‐ 06, 2 ♂; 27 ‐ II‐ 08, 1 ♂; 6 ‐ III‐ 08, 1 ♀; Mad River @ Mad River Fish Hatchery, 19 ‐ IV‐ 06, 2 ♂, 3 ♀; 7 ‐ IV‐ 07 2 ♂; 18 ‐ IV‐ 07, 1 ♂, 1 ♀; 19 ‐ IV‐ 07, 6 ♂; 5 ‐ V‐ 07, 1 ♂; 8 ‐ IV‐ 08, 1 ♀; 12 ‐ V‐ 08, 1 ♀; Mad River @ 1 st curve Mad River Rd., 20 ‐ III‐ 06, 1 ♂; 29,30 ‐ III‐ 07, 12 ♂, 10 ♀; 1 ‐ IV‐ 07, 2 ♂, 1 ♀; 3 ‐ IV‐ 07, 3 ♂, 1 ♀; 4 ‐ IV‐ 07, 1 ♀ (reared); 7 ‐ IV‐ 07, 4 ♂; 28 ‐ IV‐ 07, 1 ♂; 17 ‐ III‐ 08, 1 ♂. Holotype deposited at the California Academy of Sciences.	en	Baumann, Richard W., Lee, Jonathan J. (2009): Two Interesting New Species Of Isoperla From Northern California (Plecoptera: Perlodidae). Illiesia 5 (1): 1-10, DOI: http://doi.org/10.5281/zenodo.4758990
2373BB7A3F7B3F018EFE1C22FE5EF250.taxon	description	Male. Macropterous. Length of forewings 8.5 ‐ 10.5 mm; length of body 8.0 ‐ 9.0 mm. General body color medium brown. Head with ocelli and base of antennae connected by dark brown M‐ shaped pigment band; yellow patch forward of anterior ocellus and between lateral ocelli and compound eye; interocellar space ranging from mostly yellow to an oval, central yellow spot; occiput light brown, with lateral light oval patch broken by brown reticulations, light patch broadly to barely connected to yellow patch adjacent to eyes; antennae brown. Pronotum with wide, median light stripe; disks light brown to lateral margins, rugosities darker brown; anterior and posterior margins cream to light brown. Meso and metanota dark brown, large yellow patch anteriorly between mesonotal wing bases. Wings hyaline, veins brown, fumose in coastal space. Legs light brown, femur with proximal dorsal brown mark and longitudinal dorsal brown stripe, tibia with incomplete narrow brown band in proximal onefourth. Abdominal terga medium brown dorsally, pale laterally, a pair of median light marks on first few terga, broken brown stripes appearing weakly laterally; abdominal sterna cream colored with brown marks at pleural folds, medial and mediolateral pair of brown spots evident to varying degrees. Vesicle short, broadly rounded (Fig. 29). Cerci brown, segments with one long posteroventral seta. Paraprocts short and stout, apically pointed, barely curving over tenth tergum (Fig. 30). Aedeagus (Figs. 17 & 19) with a large posteromedial bihemispherical lobe bearing long, rust colored anteriorly directed spinules (Figs. 18 & 25); a thin, sclerotized, clavate process (lateral view), projecting from midventral margin of bi‐ hemispherical lobe, keeled dorsally and ventrally, flattening apically, heavily sculptured and spinulate (Figs. 21 ‐ 24); a pair of lobes positioned laterally on either side of bihemispherical lobe, bearing rust colored spinules directed posteriorly (Figs. 17, 20 & 26); a patch of thin light colored spinules located below clavate process, narrowed and fringed apically (Figs. 22 & 27). A band of small, light brown spinules encircling base, with areas projecting forward laterally, spinules short and rounded at apex, each with a lateral hair‐ like process (Figs. 19 & 28); anterior surface of aedeagus void of spinules (Figs. 17 & 19). Female. Macropterous. Length of forewings 10.0 ‐ 10.5 mm; length of body 9.0 ‐ 10.0 mm. General body color and head and pronotal pigmentation patterns similar to male. Subgenital plate brown, darker than rest of segment, triangular, terminating in broad triangular point, produced ¼ to ½ over length of sternum 9. Egg. Shape oval, round in cross section, narrower toward poles (Fig. 31). Collar well developed, higher and with broader flanges (Fig. 32) than shown for I. fulva and I. marmorata in Szczytko & Stewart (1979). Chorion with thickened ridges, forming pentagon shaped depressions, proteinaceous bodies sometimes present. Micropyles appearing on the bottom half of the egg. Color dark brown and opaque. Larva. Unknown.	en	Baumann, Richard W., Lee, Jonathan J. (2009): Two Interesting New Species Of Isoperla From Northern California (Plecoptera: Perlodidae). Illiesia 5 (1): 1-10, DOI: http://doi.org/10.5281/zenodo.4758990
2373BB7A3F7B3F018EFE1C22FE5EF250.taxon	etymology	Etymology. The species name is a noun in apposition and honors the Karuk people of the Klamath River in northern California. The common name Klamath Stripetail is suggested.	en	Baumann, Richard W., Lee, Jonathan J. (2009): Two Interesting New Species Of Isoperla From Northern California (Plecoptera: Perlodidae). Illiesia 5 (1): 1-10, DOI: http://doi.org/10.5281/zenodo.4758990
2373BB7A3F7B3F018EFE1C22FE5EF250.taxon	diagnosis	Diagnosis. Isoperla karuk is placed in the Isoperla marmorata complex which includes I. marmorata (Needham and Claassen) and I. fulva Claassen. It shares the following characteristics (Szczytko & Stewart 1979): 1. male aedeagus bearing a spinose, club‐ shaped, sclerotized process; 2. broadly rounded, shallow male vesicle; 3. angulate female subgenital plate (shared with I. fulva). The male is easily distinguished from other members of the complex by the unique aedeagus with a bi‐ hemispherical lobe bearing reddish brown spinulae directed anteriorly and two smaller lobes bearing reddish brown spinulae directed posteriorly. The I. karuk female cannot presently be distinguished from the female of I. fulva by the shape of the subgenital plate but the egg has a higher and more broadened collar. Nymphs that we believe are I. karuk fit the description for I. marmorata (Szczytko & Stewart 1979).	en	Baumann, Richard W., Lee, Jonathan J. (2009): Two Interesting New Species Of Isoperla From Northern California (Plecoptera: Perlodidae). Illiesia 5 (1): 1-10, DOI: http://doi.org/10.5281/zenodo.4758990
2373BB7A3F7B3F018EFE1C22FE5EF250.taxon	discussion	Remarks. This species was collected from medium sized rivers close to sea level. Adults were found from February into May. The peak I. karuk emergence period, on the Mad River, followed the peak emergence of I. pinta Frison and preceded the peak I. mormona Banks emergence period. The riverine habitat made benthic collection of nymphs problematic. Several nymphs were collected, however, and three reared nymphs turned out to be three separate Isoperla species (I. karuk, I. mormona and I. marmorata?). Field caught females and males were maintained together in order to obtain mature ova. Females were alive after 43 days and appeared to feed on, or at least consume the juice of apple slices. Since this species is difficult to separate from I. fulva in both the male and female adult stages without extruding the aedeagus or studying the eggs, the identity of specimens previously listed as I. fulva from California is questionable. Jewett (1960) in his study of the California stonefly fauna listed two records for I. fulva: one in El Dorado County and one in Modoc County. Later, Szczytko & Stewart (1979) listed two additional records: Plumas County and Modoc County (Oregon).	en	Baumann, Richard W., Lee, Jonathan J. (2009): Two Interesting New Species Of Isoperla From Northern California (Plecoptera: Perlodidae). Illiesia 5 (1): 1-10, DOI: http://doi.org/10.5281/zenodo.4758990
