Arquivos de periódicos de março 2022

14 de março de 2022

Key to some New World genera of Coenosiini and its close relatives

The body plan of Coenosia-like flies is actually convergently evolved, with some species in genera outside of Coenosiini having this body plan (predatory flies with a gray body with some small markings on the abdomen, legs with long setae, dichoptic in both sexes, etc). These are flies with the anepimeron bare (not Muscini, Stomoxyini, etc), body color not usually metallic, bare hind coxae, node of Rs and base of R4+5 bare above, vein M usually straight or only curved slightly forward, and at least one presutural dorsocentral bristle moderately strong, clearly distinguishable from surrounding setulae. This key was made to overcome accessibility issues, probably all New World genera of Coenosiini are covered here.

  1. Labella fleshy or reduced; prestomal teeth present or absent; first presutural dorsocentral bristle
    more than half as long as second, but if absent, then labella fleshy, prestomal teeth absent and male
    holoptic (aberrant Helina spp.); katepisternal bristles, if more than two in number, with lower or
    lower posterior one always closer to upper posterior one than to upper anterior one; lower proepimeral
    bristle curved dorsally; first postsutural supra-alar (prealar) present or absent; male frons varied in
    width. Hind tibia usually without posterodorsal bristles or with at most two bristles; if three or more are present, they are restricted to basal half of tibia and are much shorter than anterodorsal bristles; legs sometimes partly yellow. Hind tibia with calcar absent, at most with one to two short bristles on basal half (Non-Coenosiini)...........................................................................................................................................................2
    Labella reduced; prestomal teeth developed; first presutural dorsocentral bristle absent or weak
    and less than half as long as second and/or katepisternal bristles arranged in nearly equilateral
    or isosceles triangle, with lower bristle almost equidistant from the two upper bristles
    (rarely closer to anterior upper katepisternal bristle in Bithoracochaeta); lower proepimeral bristle
    usually curved ventrally or anteroventrally; first postsutural supra-alar (prealar) bristle
    absent; male frons at least one-fifth as wide as head................................................................................................6

  2. Katepimeron and prosternum setulose....................................................................................................Helina
    Katepimeron bare; prosternum bare or setulose.....................................................................................3

  3. Sternite 1 setulose; first postsutural supra-alar (prealar) bristle usually absent, but if
    visible, then less than half as long as second notopleural; hind tibia with anterodorsal apical bristle
    various..................................................................................................................................................................4
    Sternite 1 bare; first postsutural supra-alar bristle present or absent; hind tibia with anterodorsal
    apical bristle strong.............................................................................................................................................5

  4. Sternite 1 with few strong setae near posterior margin; frons of male narrow, frontal
    vitta obliterated on most of upper half of frons; hind tibia with anterodorsal apical bristle weak..Brontaea
    Sternite 1 with fine setulae on most of its surface; frons of male wide, frontal vitta
    distinct throughout; hind tibia with anterodorsal apical bristle strong..................................................Lispoides

  5. Arista pubescent, longest microtrichium no longer than basal diameter of arista; first postsutural
    supra-alar (prealar) bristle absent; legs entirely black...............................................................................Spilogona
    Either arista with longest microtrichium much longer than basal diameter of arista or first postsutural
    supra-alar (prealar) bristle present or legs partly to entirely yellow.......................................................Helina

  6. Dorsocentral bristles 2+4; arista short, only slightly longer than first flagellomere; Nearctic, Bahamas, South America................................................................................................................................................Tetramerinx
    Dorsocentral bristles 1-2+2-3; arista various.........................................................................................................7

  7. Profrons projected................................................................. ............................................................................Noelia
    Profrons not projected.................................................................................. ...............................................................8

  8. Parafacial with a few fine hairs on upper third. Arista with longest hairs almost twice as long as width of first flagellomere...........................................................................................................................................Pentacricia
    Parafacial bare. Arista with longest hairs at most as long as with of first flagellomere.................................9

  9. One strong presutural dorsocentral seta, sometimes preceded by a second short seta. .................................................................................................................... ........................................................................10
    Two strong presutural dorsocentral setae, more or less similar in length......................................................24

  10. Postsutural dorsocentral setae 2...........................................................................................................................11
    Postsutural dorsocentral setae 3...............................................................................................................................12

  11. Basal scutellar seta shorter the apical pair; frons longer than wide; hind tibia with long median setae on anterodorsal, anteroventral, posterodorsal and sometimes posteroventral surfaces.......Bithoracochaeta
    Basal scutellar seta as long as or longer than the apical pair; frons wider than long............Schoenomyzina

  12. Wing with anal lobe reduced............................................................................................................Cholomyioides
    Wing with anal lobe normal..........................................................................................................................................13

  13. Hind tibia with at least one anterodorsal supramedian seta in addition to the median seta...................14
    Hind tibia without any anterodorsal supramedian seta in addition to the median setae ............................18

  14. Hind tibia without any posterodorsal supramedian seta; frons wider than longer; mid tibia with anteroventral seta.....................................................................................................................................Schoenomyza
    Hind tibia with at least one posterodorsal supramedian seta; frons variable...............................................15

  15. Apical scutellar setae short...........................................................................................................................Pilispina
    Apical scutellar setae strong........................................................................................................................................16

  16. Arista bare; lower calypter may be twice as large as upper calypter..........................................Stomopogon
    Arista not as above...........................................................................................................................................................17

  17. Hind tibia with preapical setae on anterodorsal and dorsal surfaces ...................................................................................................................................................................Notoschoenomyza
    Hind tibia with preapical setae on anterodorsal, dorsal and posterodorsal surfaces..........Spathipheromyia

  18. Katepisternal seta 0:1; disc of katepisternum with numerous setulae and hairs; lower proepimeral seta directed upwards, male: prealar seta present...............................................................................Drepanocnemis
    Katepisternal setae 1:1:1; disc of katepisternum with few setulae or hairs; lower proepimeral seta directed downwards, male: prealar seta absent.......................................................................................................19

  19. Calypteres similar in length..................................................................................................................Schoenomyza
    Lower calypter about twice as long as upper calypter.........................................................................................20

  20. Arista with plumes only on basal two-thirds; hind tibia with one supramedian posterodorsal seta.....................................................................................................................................................................Plumispina
    Arista with plumes along its entire length or only on basal two-thirds but usually with only very short hairs; hind tibia only rarely with a supramedian posterodorsal setae.................................................................21

  21. Hind femur with 3 preapical setae, on anterodorsal, dorsal and posterodorsal to posterior surfaces...............................................................................................................................................................................22
    Hind femur with 2 preapical setae, on anterodorsal and posterodorsal surfaces.........................................23

  22. Antennal insertion well above mid-level of eye; one pair of postsutural intra-alar setae; lower calypter transverse......................................................................................................................................................Cordiluroides
    Antennal insertion at mid-level of eye; two pairs of postsutural
    intra-alar setae; lower calypter glossiform............................................................................Neodexiopsis, in part

  23. Gena greatly reduced, almost linear; female: ovipositor of medium length; tergites and sternites broad..................................................................................................................................................................Agenamyia
    Gena of moderate width; female: ovipositor long; tergites and sternites long and
    narrow.................................................................................................................................................Coenosia, in part

  24. Apical scutellar setae shorter than the basal setae.............................................................................Pilispina
    Apical scutellar setae as long as the basal setae....................................................................................................25

  25. Palpus rather enlarged apically; gena very deep; eyes reduced in size, with few setae around vibrissae.........................................................................................................................................................................Apsil
    Palpus slender; gena variable; eyes not or hardly reduced, with few or many setae
    around vibrissae..................................................................................................................................................................26

  26. Antennal flagellomere modified apically; hind tibia without setae on posterodorsal surface; fore tibia with mid posterior seta..................................................................................................................................Oxytonocera nigrohalterata
    Antennal flagellomere not modified apically............................................................................................................27

  27. Arista short and enlarged basally; katepisternum 2:2; claws and pulvilli small; male hypandrium not tubular; female ovipositor of moderate length with large tergites................................................Pachyceramyia
    Arista long and slender, or without the combination of above characters.......................................................28

  28. Fore tibia on posterior surface without setae; legs blackish; hind tibiae with 1 seta on posterodorsal surface; katepisternum 1:1:1 but may be with additional anterior seta.........................................................................................................................................Rhabdotoptera striatipennis
    Fore tibia usually with setae on posterior surface; not with the above combination of characters...........29

  29. ?????? Fore tibia on middle of posterior surface with, at least, one seta; katepisternal setae 1:1:1; arista long and slender; claws and pulvilli long; male: hypandrium tubular, very elongated; female: ovipositor long, with slender tergites; South America.................................................................................................Reynoldsia
    ???????............................................................................................................................................................................30

  30. Legs blackish; hind tibia with 2 anterodorsal setae...........................................................................................31
    Fore and mid tibiae, and often most of legs, yellow; hind tibia usually with one anterodorsal seta..........32

  31. Frontal vitta at level of anterior ocellus as wide in both sexes as distance between anterior pair of dorsocentral setae; ocellar triangle densely silvery pruinose in male and whitish pruinose in female, extending to anterior margin of frons.....................................................................................................Limnospila
    Frontal vitta at level of anterior ocellus narrower in both sexes than distance between anterior pair of dorsocentral setae; ocellar triangle not silvery nor whitish pruinose, and not extending to anterior margin offrons..........................................................................................................................................................Pseudocoenosia

  32. Katepisternum with 4 setae, 3 of which are located at posterior edge of sclerite.....................Macrorchis
    Katepisternum with 3 setae; postsutural dorsocentral setae 3; hind tibia without any anterodorsal supramedian seta in addition to the median setae; disc of katepisternum with few setulae or hairs; lower calypter about twice as long as upper calypter; lower proepimeral seta directed downwards, male: prealar seta absent; arista with plumes along its entire length or only on basal two-thirds but usually with only very short hairs; hind tibia only rarely with a supramedian posterodorsal setae................................................................................................................................33

  33. Hind femur with 3 preapical setae, on anterodorsal, dorsal and posterodorsal to posterior surfaces; antennal insertion at mid-level of eye; two pairs of postsutural intra-alar setae; lower calypter glossiform.......................................................................................................................................Neodexiopsis, in part
    Hind femur with 2 preapical setae, on anterodorsal and posterodorsal surfaces; postsutural dorsocentral setae 3; gena of moderate width; female: ovipositor long; tergites and sternites long and narrow.....................................................................................................................................................Coenosia, in part

Publicado em 14 de março de 2022, 01:56 AM por aispinsects aispinsects | 0 comentários | Deixar um comentário