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A new species, Isoperla dewalti Verdone & Kondratieff, 2017, is described from the Appalachian Mountains of North Carolina, Tennessee, and Virginia. The new species is proposed based on details of the male aedeagus, paraprocts, vesicle, general body coloration, female subgenital plate, and uniqueness of the ovum chorion. Supporting data includes co...
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... of Arthropod Diversity, Colorado State University, Fort Collins, Colorado (CSUIC), the Illinois Natural History Survey, Champaign, Illinois (INHS), and the United States Museum of Natural History, Washington, D.C. (USNM). The holotype of the new species is deposited in the INHS. Data for all specimens examined may be downloaded from a CSV file. (Fig. 1). Dorsal background of head pale yellow with medium brown bands connecting ocelli; bands widest anteriorly; bands truncate at anterior ocellus; triangular dusky spot anterior to anterior ocellus (Fig. 2). Antennal scape pale yellow with a diffuse diagonal brown stripe; flagellum segments 1-7 pale; remaining segments medium brown ( Figs. ...
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... file. (Fig. 1). Dorsal background of head pale yellow with medium brown bands connecting ocelli; bands widest anteriorly; bands truncate at anterior ocellus; triangular dusky spot anterior to anterior ocellus (Fig. 2). Antennal scape pale yellow with a diffuse diagonal brown stripe; flagellum segments 1-7 pale; remaining segments medium brown ( Figs. 1-2). Pronotum with a wide medial pale stripe; rugosities irregular, raised, medium brown; anterolateral margins medium brown; posterolateral margins pale (Fig. 2). Femora light brown dorsally, covered with uniformly spaced, short, brown setae; femora pale ventrally; tibia light brown, covered with uniformly spaced, short brown setae; tarsi ...
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... with a wide medial pale stripe; rugosities irregular, raised, medium brown; anterolateral margins medium brown; posterolateral margins pale (Fig. 2). Femora light brown dorsally, covered with uniformly spaced, short, brown setae; femora pale ventrally; tibia light brown, covered with uniformly spaced, short brown setae; tarsi medium brown (Fig. 1). Meso-and metanota light brown (Fig. 1). Wings hyaline, veins of forewing light basally, brown distally (Fig. 1). Terga light brown, posterior ⅓ medium brown; terga 1-8 with uniformly spaced brown setae. Sterna pale yellow to light brown; sternum 8 with a light brown recessed vesicle, 0.65X as wide as long; evenly rounded, extending to ...
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... rugosities irregular, raised, medium brown; anterolateral margins medium brown; posterolateral margins pale (Fig. 2). Femora light brown dorsally, covered with uniformly spaced, short, brown setae; femora pale ventrally; tibia light brown, covered with uniformly spaced, short brown setae; tarsi medium brown (Fig. 1). Meso-and metanota light brown (Fig. 1). Wings hyaline, veins of forewing light basally, brown distally (Fig. 1). Terga light brown, posterior ⅓ medium brown; terga 1-8 with uniformly spaced brown setae. Sterna pale yellow to light brown; sternum 8 with a light brown recessed vesicle, 0.65X as wide as long; evenly rounded, extending to the posterior margin of sternum 8 ( ...
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... brown; posterolateral margins pale (Fig. 2). Femora light brown dorsally, covered with uniformly spaced, short, brown setae; femora pale ventrally; tibia light brown, covered with uniformly spaced, short brown setae; tarsi medium brown (Fig. 1). Meso-and metanota light brown (Fig. 1). Wings hyaline, veins of forewing light basally, brown distally (Fig. 1). Terga light brown, posterior ⅓ medium brown; terga 1-8 with uniformly spaced brown setae. Sterna pale yellow to light brown; sternum 8 with a light brown recessed vesicle, 0.65X as wide as long; evenly rounded, extending to the posterior margin of sternum 8 ( Fig. 3). Paraprocts short, triangular, slightly incurved, moderately ...
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... posteroventral membranous aedeagal tube highly reduced (vestigial), appearing only occasionally as a small lobe at the base of the basal stalk (Fig. 5); aedeagus with a posteromedial rectangular patch of dense, stout, rust colored spines, and a single posterior sclerotized arrowhead shaped aedeagal spine plate with upturned distal stout spine (Figs. 8-10); apex of structure upturned with approximately 10 large stout rust colored spines (Fig. 11); base of plate with broad flat sclerotized plates with numerous small apical finger-like projections (Fig. 11); basal stalk with short sharp spinulae (Fig. 12); posterolateral lobes with sparse scale like plates medially; posteromedial area with ...
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... as a small lobe at the base of the basal stalk (Fig. 5); aedeagus with a posteromedial rectangular patch of dense, stout, rust colored spines, and a single posterior sclerotized arrowhead shaped aedeagal spine plate with upturned distal stout spine (Figs. 8-10); apex of structure upturned with approximately 10 large stout rust colored spines (Fig. 11); base of plate with broad flat sclerotized plates with numerous small apical finger-like projections (Fig. 11); basal stalk with short sharp spinulae (Fig. 12); posterolateral lobes with sparse scale like plates medially; posteromedial area with shallow shelf-like scales with apical hair-like projections (Fig. 13); lateral area with ...
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... dense, stout, rust colored spines, and a single posterior sclerotized arrowhead shaped aedeagal spine plate with upturned distal stout spine (Figs. 8-10); apex of structure upturned with approximately 10 large stout rust colored spines (Fig. 11); base of plate with broad flat sclerotized plates with numerous small apical finger-like projections (Fig. 11); basal stalk with short sharp spinulae (Fig. 12); posterolateral lobes with sparse scale like plates medially; posteromedial area with shallow shelf-like scales with apical hair-like projections (Fig. 13); lateral area with dense short sharp spinulae (Fig. 14). Female. Macropterous; forewing wing length 11.3- 12.6 mm (n=5). Body length ...
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... posterior sclerotized arrowhead shaped aedeagal spine plate with upturned distal stout spine (Figs. 8-10); apex of structure upturned with approximately 10 large stout rust colored spines (Fig. 11); base of plate with broad flat sclerotized plates with numerous small apical finger-like projections (Fig. 11); basal stalk with short sharp spinulae (Fig. 12); posterolateral lobes with sparse scale like plates medially; posteromedial area with shallow shelf-like scales with apical hair-like projections (Fig. 13); lateral area with dense short sharp spinulae (Fig. 14). Female. Macropterous; forewing wing length 11.3- 12.6 mm (n=5). Body length 9.1-10.9 mm (n=5). Body coloration and ...
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... large stout rust colored spines (Fig. 11); base of plate with broad flat sclerotized plates with numerous small apical finger-like projections (Fig. 11); basal stalk with short sharp spinulae (Fig. 12); posterolateral lobes with sparse scale like plates medially; posteromedial area with shallow shelf-like scales with apical hair-like projections (Fig. 13); lateral area with dense short sharp spinulae (Fig. 14). Female. Macropterous; forewing wing length 11.3- 12.6 mm (n=5). Body length 9.1-10.9 mm (n=5). Body coloration and morphology similar to male. Sternum 8 with variable subgenital plate extending approximately ⅓-½ over sternum 9; subgenital plate broadly rounded (Fig. 15), or ...
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... with broad flat sclerotized plates with numerous small apical finger-like projections (Fig. 11); basal stalk with short sharp spinulae (Fig. 12); posterolateral lobes with sparse scale like plates medially; posteromedial area with shallow shelf-like scales with apical hair-like projections (Fig. 13); lateral area with dense short sharp spinulae (Fig. 14). Female. Macropterous; forewing wing length 11.3- 12.6 mm (n=5). Body length 9.1-10.9 mm (n=5). Body coloration and morphology similar to male. Sternum 8 with variable subgenital plate extending approximately ⅓-½ over sternum 9; subgenital plate broadly rounded (Fig. 15), or broadly triangular, truncate with shallow posteromedian ...
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... projections (Fig. 13); lateral area with dense short sharp spinulae (Fig. 14). Female. Macropterous; forewing wing length 11.3- 12.6 mm (n=5). Body length 9.1-10.9 mm (n=5). Body coloration and morphology similar to male. Sternum 8 with variable subgenital plate extending approximately ⅓-½ over sternum 9; subgenital plate broadly rounded (Fig. 15), or broadly triangular, truncate with shallow posteromedian emargination (Fig. 16), or broadly triangular (Fig. ...
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... 14). Female. Macropterous; forewing wing length 11.3- 12.6 mm (n=5). Body length 9.1-10.9 mm (n=5). Body coloration and morphology similar to male. Sternum 8 with variable subgenital plate extending approximately ⅓-½ over sternum 9; subgenital plate broadly rounded (Fig. 15), or broadly triangular, truncate with shallow posteromedian emargination (Fig. 16), or broadly triangular (Fig. ...
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... wing length 11.3- 12.6 mm (n=5). Body length 9.1-10.9 mm (n=5). Body coloration and morphology similar to male. Sternum 8 with variable subgenital plate extending approximately ⅓-½ over sternum 9; subgenital plate broadly rounded (Fig. 15), or broadly triangular, truncate with shallow posteromedian emargination (Fig. 16), or broadly triangular (Fig. ...
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... 11-14. Isoperla dewalti sp. n., Helton Creek, Grayson Co., Virginia. Fig. 11. Posterior sclerotized arrowhead shaped aedeagal spine plate with upturned distal stout spine and broad flat sclerotized plates with numerous small apical finger-like projections, 1,800X. Fig. 12. Short sharp spinulae, 700X. Fig. 13. Shelf- like scales with apical hair-like projections, 1,200X. Fig. 14. Aedeagus, lateral, lateral area ...
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... 11-14. Isoperla dewalti sp. n., Helton Creek, Grayson Co., Virginia. Fig. 11. Posterior sclerotized arrowhead shaped aedeagal spine plate with upturned distal stout spine and broad flat sclerotized plates with numerous small apical finger-like projections, 1,800X. Fig. 12. Short sharp spinulae, 700X. Fig. 13. Shelf- like scales with apical hair-like projections, 1,200X. Fig. 14. Aedeagus, lateral, lateral area with dense short sharp spinulae (arrow) 65X. triangular, distinct cross shaped ridges dividing anterior and posterior poles; anterior end concave (Fig. 18). Color pale brown. Collar ...
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... 11-14. Isoperla dewalti sp. n., Helton Creek, Grayson Co., Virginia. Fig. 11. Posterior sclerotized arrowhead shaped aedeagal spine plate with upturned distal stout spine and broad flat sclerotized plates with numerous small apical finger-like projections, 1,800X. Fig. 12. Short sharp spinulae, 700X. Fig. 13. Shelf- like scales with apical hair-like projections, 1,200X. Fig. 14. Aedeagus, lateral, lateral area with dense short sharp spinulae (arrow) 65X. triangular, distinct cross shaped ridges dividing anterior and posterior poles; anterior end concave (Fig. 18). Color pale brown. Collar well-developed, flared apically with elevated ...
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... sp. n., Helton Creek, Grayson Co., Virginia. Fig. 11. Posterior sclerotized arrowhead shaped aedeagal spine plate with upturned distal stout spine and broad flat sclerotized plates with numerous small apical finger-like projections, 1,800X. Fig. 12. Short sharp spinulae, 700X. Fig. 13. Shelf- like scales with apical hair-like projections, 1,200X. Fig. 14. Aedeagus, lateral, lateral area with dense short sharp spinulae (arrow) 65X. triangular, distinct cross shaped ridges dividing anterior and posterior poles; anterior end concave (Fig. 18). Color pale brown. Collar well-developed, flared apically with elevated longitudinal ridges; base not offset from egg body (Fig. 19). Hexagonal ...
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... small apical finger-like projections, 1,800X. Fig. 12. Short sharp spinulae, 700X. Fig. 13. Shelf- like scales with apical hair-like projections, 1,200X. Fig. 14. Aedeagus, lateral, lateral area with dense short sharp spinulae (arrow) 65X. triangular, distinct cross shaped ridges dividing anterior and posterior poles; anterior end concave (Fig. 18). Color pale brown. Collar well-developed, flared apically with elevated longitudinal ridges; base not offset from egg body (Fig. 19). Hexagonal follicle cell impressions well-developed with thickened ridges and with numerous small mounds between reticulations (Figs. 18, 20). Eclosion line absent, micropyles arranged singularly or in ...
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... projections, 1,200X. Fig. 14. Aedeagus, lateral, lateral area with dense short sharp spinulae (arrow) 65X. triangular, distinct cross shaped ridges dividing anterior and posterior poles; anterior end concave (Fig. 18). Color pale brown. Collar well-developed, flared apically with elevated longitudinal ridges; base not offset from egg body (Fig. 19). Hexagonal follicle cell impressions well-developed with thickened ridges and with numerous small mounds between reticulations (Figs. 18, 20). Eclosion line absent, micropyles arranged singularly or in threes, positioned on top of cross ridges near anterior ⅓ of egg (Figs. 18, 20). Larva. Unknown. bars connecting the ocelli, and-albeit ...
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... shaped ridges dividing anterior and posterior poles; anterior end concave (Fig. 18). Color pale brown. Collar well-developed, flared apically with elevated longitudinal ridges; base not offset from egg body (Fig. 19). Hexagonal follicle cell impressions well-developed with thickened ridges and with numerous small mounds between reticulations (Figs. 18, 20). Eclosion line absent, micropyles arranged singularly or in threes, positioned on top of cross ridges near anterior ⅓ of egg (Figs. 18, 20). Larva. Unknown. bars connecting the ocelli, and-albeit vestigial-a posteroventral membranous aedeagal tube. The new species is easily distinguished from I. montana and I. nelsoni by the lack of a ...
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... with elevated longitudinal ridges; base not offset from egg body (Fig. 19). Hexagonal follicle cell impressions well-developed with thickened ridges and with numerous small mounds between reticulations (Figs. 18, 20). Eclosion line absent, micropyles arranged singularly or in threes, positioned on top of cross ridges near anterior ⅓ of egg (Figs. 18, 20). Larva. Unknown. bars connecting the ocelli, and-albeit vestigial-a posteroventral membranous aedeagal tube. The new species is easily distinguished from I. montana and I. nelsoni by the lack of a well-developed posteroventral membranous aedeagal tube. Several paratype specimens of I. dewalti that are deposited in the C. P. Gillette ...
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... tube did not evert. However, it is the experience of the authors that when a well- developed aedeagal tube is present it is the first structure to evert. Additionally, differences in the posteromedial patch of spines distinguish the two species. In I. dewalti the posteromedial patch of spines is broad, appearing as a uniform rectangular patch (Figs. 8-10). Whereas, in I. montana the posteromedial patch of spines is narrow, appearing as a thin ridge (figs. 33.15-33.16, Szczytko & Kondratieff 2015). Furthermore, I. montana possesses a dorsal rounded mound of dense, ...
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... 18-20. Isoperla dewalti sp. n., Tributary to Le Conte Creek, Sevier Co., Tennessee. Fig. 18. Ovum, 400X. Females of the new species are most similar to I. montana and I. kirchneri Szczytko & Kondratieff, 2015. Females of the new species have a subgenital plate that extends approximately ⅓-½ over sternum 9 and appears broadly rounded (Fig. 15), or broadly triangular, truncate with shallow posteromedian emargination (Fig. 16), ...
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... 18-20. Isoperla dewalti sp. n., Tributary to Le Conte Creek, Sevier Co., Tennessee. Fig. 18. Ovum, 400X. Females of the new species are most similar to I. montana and I. kirchneri Szczytko & Kondratieff, 2015. Females of the new species have a subgenital plate that extends approximately ⅓-½ over sternum 9 and appears broadly rounded (Fig. 15), or broadly triangular, truncate with shallow posteromedian emargination (Fig. 16), or broadly triangular (Fig. 17), and have a dorsal head pattern with brown bands connecting the ocelli that are truncate at the anterior ocellus with a triangular dusky spot anterior to the anterior ocellus (Fig. 2). Ova of the new species are similar ...
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... Tennessee. Fig. 18. Ovum, 400X. Females of the new species are most similar to I. montana and I. kirchneri Szczytko & Kondratieff, 2015. Females of the new species have a subgenital plate that extends approximately ⅓-½ over sternum 9 and appears broadly rounded (Fig. 15), or broadly triangular, truncate with shallow posteromedian emargination (Fig. 16), or broadly triangular (Fig. 17), and have a dorsal head pattern with brown bands connecting the ocelli that are truncate at the anterior ocellus with a triangular dusky spot anterior to the anterior ocellus (Fig. 2). Ova of the new species are similar to I. kirchneri, I. montana, I. nelsoni, and I. signata (Banks, 1902), all of which ...
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... Females of the new species are most similar to I. montana and I. kirchneri Szczytko & Kondratieff, 2015. Females of the new species have a subgenital plate that extends approximately ⅓-½ over sternum 9 and appears broadly rounded (Fig. 15), or broadly triangular, truncate with shallow posteromedian emargination (Fig. 16), or broadly triangular (Fig. 17), and have a dorsal head pattern with brown bands connecting the ocelli that are truncate at the anterior ocellus with a triangular dusky spot anterior to the anterior ocellus (Fig. 2). Ova of the new species are similar to I. kirchneri, I. montana, I. nelsoni, and I. signata (Banks, 1902), all of which are oblong and triangular in ...
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... Similar to other eastern Nearctic Isoperla described since 2015 (I. evanescens, Isoperla dewalti Verdone & Kondratieff, 2017;and I. borisi), I. riverae sp. n. had been lumped with previously described species; I. dicala in the adult stage (Stark & Gaufin 1978;Stark & Harris 1986;Szczytko & Kondratieff 2015) and I. dicala and I. davisi in the larval stage (unpublished NCDEQ data). ...
Isoperla riverae sp. n. is described from the southeastern USA. The new species is proposed based on details of the adult habitus, male aedeagus, vesicle, female subgenital plate, ovum chorion, and larval habitus. Supporting data includes color images, scanning electron micrographs, genetic analysis of DNA barcodes, and comparative morphology of cognate species. The larva of Isoperla lenati Szczytko & Kondratieff, 2015 is also described supported by color images.
... The aedeagi were everted using wide tipped forceps, thereafter the specimens were fixed in position by briefly submerging them in near boiling water. Eversion of preserved specimens was achieved using the methods detailed in Verdone & Kondratieff (2017). ...
Acroneuria Pictet, 1841 (Plecoptera: Perlidae) is a genus of stoneflies which presently includes 18 summer emerging Nearctic species. Diagnosis of species relies primarily on male aedeagal setal patterns, details of the ovum chorion, and larval dorsal maculations. Several species are morphologically cryptic in one or more life stages. In 2010, an apparently rare species, A. kosztarabi Kondratieff & Kirchner, 1993, was petitioned for listing under the Endangered Species Act. A status survey conducted in 2016–2017 produced new specimen collections from near the type locality and surrounding areas. Examination of new material and the holotype of A. kirchneri Stark & Kondratieff, 2004 demonstrates that it is a junior subjective synonym of A. kosztarabi. All life stages of A. kosztarabi are redescribed using color photographs and scanning electron microscope photomicrographs. Supporting data include maximum likelihood and pairwise genetic distance analyses based on mitochondrial cytochrome c oxidase subunit I fragment data. Acroneuria kosztarabi, previously known only from the type locality, is now reported from six states in the southeastern United States ranging from central North Carolina to western Tennessee and north to northern Virginia and northern Ohio.
... The Isoperla fauna of North Carolina presently includes 30 recognized species,15 of which are newly described (Szczytko & Kondratieff 2015a, Verdone & Kondratieff 2017, DeWalt et al. 2017 and is easily the most species-rich stonefly genus in the state (Beaty 2015). Kondratieff et al. (1995) provided the first comprehensive list of Isoperla in North Carolina (Table 1), totaling only 14 species of Isoperla at that time. ...
... namata Frison, 1942;and I. similis (Hagen, 1861), were not confirmed as valid North Carolina records by Szczytko & Kondratieff (2015a) likely caused by misidentification of larvae of cryptic species. In addition, Szczytko and Kondratieff (2015a) provide the first North Carolina published records of I. montana Banks, 1898, although these records may refer to either I. kirchneri Szczytko and Kondratieff, 2015 or I. dewalti, a species recently described from the southern Appalachians by Verdone and Kondratieff (2017). ...
Two new perlodid stonefly species, Isoperla arcana Beaty, Holland, Lenat, 2017and I. borisi Beaty, Holland, Lenat, 2017, are described from North Carolina, U.S.A. Associated images, scanning electron micrographs, and illustrations of reared adult males, females, larvae, and eggs are presented for each species. In addition, a map is included depicting the North Carolina distributions of each species. Adult males of the recently described I. powhatan Szczytko and Kondratieff, 2015 were also reared from larvae collected from a North Carolina stream. This represents a range extension for I. powhatan, previously known only from Pennsylvania and Virginia. Including Isoperla borisi sp. nov., I. arcana sp. nov. and the range extension of I. powhatan, thirty Isoperla species are now known from North Carolina.
It is with great sadness that I share with you the death of Dr. Boris Carl Kondratieff (30 April 1954 to 14 August 2022) (Fig. 1). Boris was a 35 year employee of Colorado State University (CSU). He served as Director of the C. P. Gillette Museum of Arthropod Diversity, a collection of nearly 3.5 million specimens, most of which were amassed after his hire in 1986. He taught many courses at CSU and they were nearly always filled to capacity. Boris served as advisor for some 50 master’s and PhD students. He was highly sought after for graduate committees. His students conducted many high-quality research projects on the taxonomy, biogeography, and ecology of aquatic insects. In later years he collaborated with such luminaries of aquatic ecology as N. LeRoy Poff and James V. Ward, both of CSU.
