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Wing venation pattern of Plecoptera (Insecta: Neoptera)
Olivier Béthoux
Illiesia 2005 1(9):52-81 (27 December 2005)
Some consider the order Plecoptera as the sister-group of all neopterous insects. Hence the interpretation of Plecoptera wing venation has critical implications for character polarization among basal neopterous taxa, i.e. polyneopterous insects, and especially for fossil taxa, mainly known after isolated wings. However, no consensus ever emerged from the previous interpretations, partly contradicting. This study provides a detailed morphological comparative study of the wing venation of the order Plecoptera, based on modern taxa. It reveals that 1) the arculus is not a posterior branch of the media but a secondarily strengthened cross-vein, always present in hind wings and very generally in forewings; 2) the media is primitively two-branched in both wing pairs; 3) in hind wings the stems of the radius and the media are basally distinct, but a fusion of the posterior radius (RP) with the media (M) occurs distal to the wing base, both branches diverging further; and 4) the vannus is composed of branches belonging to the anterior analis sector (AA) only (i.e. the analis posterior and jugal areas are lacking). A new nomenclature is proposed for describing the branches of AA2. Character states presence of an arculus in both fore- and hind wings, media two-branched, and in hind wings, presence of fusion of RP with M are diagnostic of the order, based on outgroup comparison with other polyneopterous insects. Similarities are noticed between most basal Archaeorthoptera (i.e. insects close related to Orthoptera) and Plecoptera concerning the organization of the anal area, although an AP area is retained in the former and absent in the latter. Additionally, wing characters susceptible of being informative for the resolution of the inner phylogeny of the Plecoptera are proposed throughout the paper.
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Leuctra astridae, a New Species of Plecoptera from the Austrian Alps.
Wolfram Graf
Illiesia 2005 1(8):47-51 (30 November 2005)
Leuctra astridae sp. n., a member of Leuctra hippopus-group, occitana-subgroup from Styria, Austria, is described and illustrated. Differences to its closest relative, Leuctra festai, are given.
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The Larva of Spaniocercoides hudsoni Kimmins (Plecoptera: Notonemouridae) from New Zealand.
Ian McLellan
Illiesia 2005 1(7):43-46 (17 November 2005)
The larva of Spaniocercoides hudsoni is described for the first time, notes are given on habitat and distribution of the species is shown.
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Zealeuctra talladega, a new species of Leuctridae (Plecoptera) from Alabama, U.S.A.
Scott A. Grubbs
Illiesia 2005 1(6):40-42 (12 September 2005)
A new species of Zealeuctra Ricker is proposed from the southwestern Appalachian Mountain region of east-central Alabama, U.S.A. Zealeuctra talladega, sp. n., is described from the adult male and female and distinguished from closely-related Z. claasseni and Z. hitei by the short, blunt epiproct spine that bears an angular shelf-like anterior projection and a narrow U-shaped cleft along the ninth tergum. The type locality represents a substantial southeastern range extension for the genus.
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A new species of Notoperla (Plecoptera: Gripopterygidae) from Chile
Ian McLellan, Maritza Mercado & Simon Elliott
Illiesia 2005 1(5):33-39 (14 April 2005)
Notoperla macdowalli new species is described from an apterous male and larvae collected from Estero La Leonera, Santuario de la Naturaleza Yerba Loca, Región Metropolitana, Chile. A comparison with the other species of the genus and a description of habitat are given.
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Life history of the stonefly Isogenoides zionensis (Plecoptera:Perlodidae) from the San Miguel River, Colorado
John B. Sandberg & Kenneth W. Stewart
Illiesia 2005 1(4):21-32 (4 April 2005)
The detailed life history of a San Miguel River, Colorado, population of Isogenoides zionensis is reported. Adult emergence, determined from exuvial counts, and adult presence were synchronized over a 20-day period from late June to early July 1999. Sex ratio for 1999 adults was 1.85 male:1 female. Observed oviposition behavior involved undulating flights over the river, with females descending to the water surface to release eggs. Females emerge with eggs nearly mature and produce up to three egg masses with an average 499, 176, and 50 eggs, respectively. Captive-reared males and females lived an average of 7 and 8 days respectively. The approximate 8-month or longer egg diapause and growth of nymphs in the field, beginning in May the following year, resulted in a semivoltine life cycle.
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Larvae of the winter stonefly genus Allocapnia (Plecoptera: Capniidae) in Mississippi, USA
Bill P. Stark & Joe W. Lacey
Illiesia 2005 1(3):10-20 (7 March 2005)
Larval associations were made for four common Allocapnia species in Mississippi (USA) and a comparative study of pharate and adult males was completed with scanning electron microscopy. Descriptions are provided for pre-emergent larvae of A. aurora Ricker, A. mystica Frison, A. starki Kondratieff & Kirchner and A. virginiana Frison, and a provisional key is presented for larval Capniidae known to occur in Mississippi.
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Cryptoperla dui, sp. n., a new stonefly from South China (Plecoptera: Peltoperlidae).
Ignac Sivec
Illiesia 2005 1(2):8-9 (26 January 2005)
Cryptoperla dui, sp. n. is described from male specimens taken in Sichuan, and Yunnan provinces, China. The new species is superficially similar to C. bisaeta (Kawai) and C. kali Stark but may not be phylogenetically close to either.
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New species of Tyloperla (Plecoptera: Perlidae) from Vietnam and Thailand.
Bill P. Stark & Ignac Sivec
Illiesia 2005 1(1):1-7 (25 January 2005)
Two new species of Tyloperla Sivec & Stark are proposed from Vietnam and one from Thailand. The new taxa , T. courtneyi, sp. n., T. illiesi, sp. n. and T. khang, sp. n. are described from adult specimens and are compared to others in the genus. A provisional key for males of the genus is presented.
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