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Oregon and Washington (Hem Iptera: Heteroptera)

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Oregon and Washington (Hem Iptera: Heteroptera) 1)105 a. 15C LP. a. The Corixidae of Oregon and Washington (Hem iptera: Heteroptera) Technical Bulletin 150 AGRICULTURAL EXPERIMENT STATION Oregon State University Corvallis, Oregon March 1986 Dedication This bulletin is dedicated to Gerald F. Kraft of Western Washington University, to the late Herbert B. Hungerford of the University of Kansas, and to Robert L. Usinger of the University of California at Berkeley. These individuals introduced the authors to the fascinating diversity of aquatic insects. The Corixidae of Oregon and Washington (Hemiptera: Heteroptera) Contents Introduction.................................................................................. 1 Synopsis....................................................................................... 1 Classification.................................................................................2 Habitats and Distribution.................................................................. 2 Feeding Habits................................................................................4 Predators and Parasites..................................................................... 5 LifeHistory................................................................................... 6 Dispersal....................................................................................... 9 Respiration....................................................................................11 Osmoregulation and Ionic Balance.......................................................12 Sound Production...........................................................................13 Population Ecology.........................................................................14 General Morphology........................................................................15 Key to the Oregon and Washington Genera of Corixidae(Adults) ..................21 Tribe Graptocorixini.............................................................................22 Genus Graptocorixa Hungerford........................................................23 Graptocorixacalifornica(Hungerford) ...........................................23 Tribe Corixini......................................................................................24 Genus Callicorixa White...................................................................24 Key to Callicorixaof Oregon and Washington .........................................24 Callicorixa audeni Hungerford.....................................................25 Callicorixascudderi Jansson........................................................25 Callicorixa vu/nerata (Uhler)........................................................26 Genus Cenocorixa Hungerford...........................................................29 Key to Cenocorixa of Oregon and Washington........................................30 Cenocorixa andersoni Hungerford................................................31 Cenocorixa bifida hungerfordi Lansbury........................................32 Cenocorixa blaisdelli(Hungerford) ...............................................32 Cenocorixa expleta (Uhler) ..........................................................33 Cenocorixa utahensis(Hungerford) ...............................................33 Cenocorixa wileyae(Hungerford) .................................................34 Genus Corisella Lundblad................................................................. 38 Key to Corisella of Oregon and Washington............................................39 Corisella decolor (Uhler).............................................................39 Corisella inscripta (Uhler)............................................................ 40 Corisella tarsalis(Fieber) ............................................................43 Genus Hesperocorixa Kirkaldy...........................................................44 Key to Hesperocorixa of Oregon and Washington....................................45 Hesperocorixa atopodonta(Hungerford) ........................................45 Hesperocorixa laevigata (Uhler)....................................................46 Hesperocorixa michiganensis(Hungerford) .....................................46 Hesperocorixa vulgaris(Hungerford) .............................................48 II Genus Sigara Fabricius .....................................................................49 Key to Sigara of Oregon and Washington...............................................50 Sigara (Vermicorixa) alternata (Say) ...............................................51 Sigara (Arcotosigara) decoratella (Hungerford) ................................52 Sigara (Vermicorixa) grossolineata Hungerford ................................52 Sigara (Vermicorixa) krafti Stonedahl............................................53 Hungerford................................... Sigara (Vermicorixa) mckinstryi 53 Sigara (Vermicorixa) omani (Hungerford) .......................................54 Sigara (Vermicorixa) vandykei Hungerford .....................................54 Sigara (Vermicorixa) washingtonensis Hungerford ............................55 Genus Trichocorixa Kirkaldy.............................................................59 Trichocorixa verticaliscalifornica Sailer..........................................59 Distribution Maps........................................................................ 62-73 Literature Cited.............................................................................. 74 AUTHORS: Gary M. Stonedahl is a research associate in the Department of Entomology, Oregon State University. John D. Lattin is professor of entomology and curator of the Systematic Entomology Laboratory, Department of Entomology, Oregon State University. iii LIST OF FIGURES Figure1. Corixidae: scanning electron micrographs of clavusof hemelytron.......... 18-19 Figures 2-6.General morphologyof Corixidae .................................................. 20 Figures7-9.Graptocorixa californica: adult male, female hemelytron, male fore leg ......................................................................................................... 22 Figures 10-11.Graptocorixa californica: male abdomen, right clasper of male genitalia .............................................................................................. 23 Figures 12-18.Callicorixa species: adult male, male abdomen, female pronotal disk, female hemelytron ................................................................................. 27 Figures 19-26.Callicorixa species: male foreleg, right clasper of male genitalia ........... 28 Figures 27-33.Cenocorixa species: female hemelytron, dorsal view of adult ............... 35 Figures 34-45.Cenocorixa species: female pronotal disk, right clasper of male genitalia .............................................................................................. 36 Figures 46-51.Cenocorixa species: male fore leg ................................................ 37 Figures 52-57.Corisella species: female hemelytron, right clasper of male genitalia ...... 41 Figures 58-63.Corisella species: male fore leg, male abdomen ................................ 42 Figures 64-67.Corisella species: adult male, female pronotal disk ........................... 43 Figures 68-76.Hesperocorixa species: dorsal view of adult, female hemelytron, right clasper of male genitalia ........................................................................... 47 Figures 77-80.Hesperocorixa species: male fore leg ............................................ 48 Figures 81-88.Sigara species: female hemelytron ............................................... 56 Figures 89-97.Sigara species: male abdomen, adult male ...................................... 57 Figures 98-113.Sigara species: right clasper of male genitalia, mesepimeral process of female ............................................................................................. 58 Figures 114-116.Trichocorixa verticalis: dorsal view of adult, female hemelytron, male fore leg ......................................................................................... 60 Figures 117-118.Trichocorixa verticalis: male abdomen, right clasper of male genitalia ....................................................................................... 61 Figures 119-142.Distribution maps of Oregon and Washington Corixidae ............ 62-73 The Corixidae of Oregon and Washington (Hemiptera: Heteroptera) Gary M. Stonedahl and John D. Lattin ABSTRACT Seven genera and 26 species of Corixidae are reported from Oregon and Washington.The literature of the family isreviewed,and diagnostic keys for the identification of genera and species aregiven.Diagnoses, habitat informa- tion,illustrations of morphologicalstructures,and distribution maps are provided for all species. Introduction The Corixidae is the largest family of aquatic Herniptera. It is com- prised of approximately 30 genera distributed among six subfamilies, and contains well over 500 species oh a worldwide basis. They are familiar insects in most aquatic habitats, and in general are adaptable to a wide range of environmental conditions. The high dispersal potential of this group allows the insects to use many unstable and temporary habitats. Corixids, or water boatmen, are strong and agile swimmers; their large, flattened, oarlike hind legs are well adapted for underwater locomotion. Although classified as fully aquatic insects, water boatmen must come to the surface periodically to replenish
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