VOLUME FIFTEEN: 2019
First SEM micrographs of representatives of Pachyleuctra Despax, 1929 and
Tyrrhenoleuctra Consiglio, 1957 (Plecoptera: Leuctridae).
Bill P. Stark and Charles H. Nelson
Illiesia 2019 15(06):98–106. Figures 1–22, 20 references (pp.:105–106.) (9 October 2019)
Adult terminalia of two populations of Pachyleuctra Despax, 1929 and three populations of Tyrrhenoleuctra Consiglio, 1957 were examined with scanning electron microscopy in order to provide details of various anatomical features exhibited by species in these genera.
Keywords: Plecoptera, Leuctridae, Pachyleuctra, Tyrrhenoleuctra, scanning electron microscopy
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Decline of the giant salmonfly Pteronarcys californica Newport, 1848 (Plecoptera: Pteronarcyidae) in the Provo River, Utah, USA.
Jackson H. Birrell, Jared B. Meek and C. Riley Nelson
Illiesia 2019 15(05):83–97. Figures 1–5, 1 Table, 69 references (pp.:93–97.) (30 September 2019)
Anthropogenic disturbances are causing many aquatic insect species, including those in Plecoptera, to lose geographic range, and, in some cases, succumb to extinction. One species, Pteronarcys californica Newport, 1848, has declined in several rivers in the western United States during the past century. It has been extirpated from the Arkansas River of Colorado and the Logan River of northern Utah and is now in decline in the Provo River of central Utah. We sampled the Provo River for two years (2016–2017) to determine the abundance and distribution of P. californica and other stonefly species. In over 300 samples, we found only 17 P. californica individuals. Our study demonstrates that their abundance and distribution have declined dramatically when compared to baseline values obtained from museum records, unpublished data and publications from the past century. Total stonefly species abundance and richness may also be lower compared to historical data. Because Plecoptera are bioindicators of water quality, this decline indicates that the health of the Provo River is deteriorating, especially in the lower reaches where few stoneflies were found. These findings suggest that active steps should be taken to protect the Provo River and its aquatic biodiversity.
Keywords: stonefly, bioindicators, dams, conservation
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The larva of Perlesta adena Stark, 1989 (Plecoptera: Perlidae).
Bill P. Stark and Audrey B. Harrison
Illiesia 2019 15(04):79-82. Figures 1-3, 14 references (pp.:81-82.) (9 August 2019)
Only ten of the 32 proposed Nearctic Perlesta species are known in the larval stage. In this study an additional association and description was made for the larva of Perlesta adena Stark, 1989. The pigment pattern of the larva is characterized by a distinct pale M-line on the frons and a series of pale, median spots on abdominal terga 2-10 that comprise a median pale stripe. The larval stage of this species is most similar to that of Perlesta fusca Poulton & Stewart, 1991, and P. xube Stark & Rhodes, 1997, among described species.
Keywords: Plecoptera, Nearctic, Perlesta adena, larval description
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A new species of Zealeuctra Ricker, 1952 (Plecoptera: Leuctridae) from North Carolina, U.S.A.
Chris J. Verdone, Steven R. Beaty, Victor B. Holland & Boris C. Kondratieff
Illiesia 2019 15(03):65-78. Figures 1-23, 20 references (pp.:77-78.) (17 June 2019)
The stonefly genus Zealeuctra Ricker, 1952 (Plecoptera: Leuctridae) is reported from North Carolina, U.S.A. for the first time by the new species, Z. uwharrie sp. n. described from the Carolina Slate Belt. The new species is proposed based on details of the male 9th abdominal tergum, epiproct, abdominal sclerotization, and the female 7th sternite. Supporting data includes scanning electron micrographs and color images of all life stages including the adult male and female, larva, and ovum. A distribution map, biological notes and an amended key are also presented.
Keywords: Plecoptera, Leuctridae, Zealeuctra, new species, Carolina Slate Belt, North Carolina
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Two new species of Dictyogenus Klapálek, 1904 (Plecoptera: Perlodidae) from the Jura Mountains of France and Switzerland, and from the French Vercors and Chartreuse Massifs.
Jean-Paul G. Reding, Bertrand Launay, Jacques Le Doaré, Alexandre Ruffoni & Gilles Vinçon
Illiesia 2019 15(02):27-64. Figures 1-93, 62 references (pp.:62-64.) (17 June 2019)
Two new species of Dictyogenus Klapálek, D. jurassicum sp. n., endemic to the Jura Mountains of France and Switzerland, and D. muranyii sp. n., endemic to the French Vercors and Chartreuse Massifs, are described from adult, larva, egg characters and molecular markers. Information on the distribution, ecological preferences and conservation status of these new species is also provided. Identification keys for adults and larvae of Dictyogenus are proposed.
Keywords: stoneflies, Dictyogenus jurassicum, Dictyogenus muranyii, egg morphology, larval morphology, endemism, karstic springs, identification keys
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A review of the genus Bolshecapnia Ricker, 1965 (Plecoptera: Capniidae), and recognition of two new Nearctic capniid genera.
Hannah Jean Broome, Bill P. Stark & Richard W. Baumann
Illiesia 2019 15(01):1-26. Figures 1-72, 1 Table, 25 references (pp.:25-26.) (15 March 2019)
Male epiprocts of five of the six species currently placed in the genus Bolshecapnia Ricker, 1965 were examined with scanning electron microscopy. In addition to the plesiomorphic characters historically used to define the genus (e.g. ventral male vesicle), these species share at least one potentially apomorphic character of the epiproct, a long median groove with a pair of low parallel ridges that extend for most of the epiproct length, but additional epiproct apomorphies emphasize fundamental differences within the group. No new species are proposed, but we recognize two new genera, Eurekapnia gen. n., based on Capnia maculata Jewett, 1954, and Sasquacapnia gen. n., based on Capnia (Bolshecapnia) sasquatchi Ricker, 1965. A modified, partial key is presented to accommodate adults of the new genera, and revised keys are presented for adults of the species of Bolshecapnia and Sasquacapnia.
Keywords: Keywords: Plecoptera, Capniidae, Bolshecapnia, epiproct morphology, scanning electron microscopy, new genera
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