Nearctic Anthomyzidae: a monograph of Anthomyza and allied genera (Diptera)
Roháćek, Jindřich
Barber, Kevin N.
Acta Entomologica Musei Nationalis Pragae
2016
suppl.
2016-12-30
56
1
412
89ZW6
Roháćek & Barber, 2016
Roháćek & Barber
2016
[483,703,347,372]
Insecta
Anthomyzidae
Anthomyza
Animalia
Diptera
126
123
Arthropoda
species
oblonga
sp. nov.
( Figs 206, 223, 225–238)
Type material. HOLOTYPE: ♂, “CAN:ON: SSMarie, Bristol Pl.Pk., 04.vii.2008, KNBar-ber, sweeps, Impatiens, Clematis, Equisetum, Rub-us, ferns, Phalaris 46°30.77’N 84°16.66’W” and “ Holotypus ♂ Anthomyzaoblonga sp.n., J. Roháček & K. N. Barberdet. 2013” (red). The specimenis in perfect condition, with highly visible, partly exposed genitalia (see Fig. 206) ( CNCI, intact). PARATYPES: CANADA: MANITOBA:Ninette, 13.vi.1958, 1 ♀, C. D. F. Miller leg.( CNCI); Ninette, ex. Rudbeckia laciniota, 3.vi.1958, 1 ♂, maple/ elmnoodplain community, 12.vi.1958, 2 ♂♂ 2 ♀♀, J. F. McAlpine leg. ( CNCI). NEWFOUNDLAND:Port aux Basques, 6.viii.1961, 1 ♀, C. P.Alexander leg. ( USNM, 1 ♀genit. prep.). NOVA SCOTIA:C[ape] B[reton] H[ighlands] N. P., Beulach Ban Falls, PG812870, swept along fast rocky stream, 8.vii.1983, 2 ♀♀; Truro, 14.vii.1983, 1 ♀, all J. R. Vockeroth leg. (all CNCI). ONTARIO:Algonquin, mixed wood, 1.vi.1991, 1 ♂, M. Barták leg.( MBPC, genit. prep.); Cootes Paradise nr. Dundas, sweeping undergrowth of deciduous forest, 20.viii.1994, 17 ♂♂ 9 ♀♀, J. Roháček leg. ( SMOC 14 ♂♂ 8 ♀♀, 3 ♂♂ 3 ♀♀genit prep., NMPC 3 ♂♂ 1 ♀); Dubreuilville, 48°21.05'N 84°33.84'W, sweeping Diervilla, ferns, Clintonia, Cornus, Aralia, Eurybia, Vacciniumunder Populus/ Pinus, 10.vii.2010, 1 ♀, J. Roháček leg. ( SMOC, genit. prep.); Fergus, Malaise trap, 21.vii.1990, 1 ♂, S. A. Marshall leg. ( DEBU); Fort Frances, 10 miE on Hwy. 11, 8–9.vii.1978, 1 ♀, H. J. Teskey leg. ( CNCI); Greenwater P. Pk., Green Trail, 49°11.73'N 81°16.76'W, sweeps, Eurybia, Cornus, Clintonia, Diervilla, Araliaunder Populus, 21.vii.2009, 1 ♂, K. N. Barber leg. ( DEBU01502212); 7 miE Grifnth, 22.vi.1985, 1 ♂, B. E. Cooper leg. ( CNCI); Icewater Creek WS [watershed], ~ 12.7 kmNNE Searchmont, mi. 10.5 Whitman Dam Rd., alderthicket, 1.viii.1986, 1 ♀( CNCI); Icewater Creek WS [watershed], 46°53.7'N 84°03.4'W, sweeps, Thalictrum, Eupatorium[ Eutrochium], sedge, fernin mixed forest, 7.vii.1998, 6 ♂♂ 4 ♀♀( CNCI 4 ♂♂ 2 ♀♀, 1 ♀genit. prep., USNM 2 ♂♂ 2 ♀♀), sweeps, Thalictrum, sedge, fern, riparian mixed forest, 7.vii.1998, 3 ♂♂ 4 ♀♀( AMNH 2 ♂♂ 2 ♀♀, CNCI 1 ♂ 2 ♀♀, 1 ♂ 1 ♀genit. prep.), sweeps, Thalictrum, Eupatorium[ Eutrochium], fernin mixed forest, 10.vii.1998, 2 ♀♀( 1 ♀genit. prep.), sweeps, trailside sedges, ferns, grasses, 10.vii.1998, 2 ♀♀, sweeps, trailside veg. incl. sedges, ferns, grasses, 17.vii.1998, 1 ♀(genit. prep.) ( CNCI); King Mt., 26 kmN S[ault] S[te.] Marie, riparian sweeps, 16.vi.1987, 1 ♀( CNCI), all K. N. Barber leg.; Moosonee, 51.24622°N 80.67281°W, Repl. 1 mesic, Malaise trap, 18–21.vi.2010, 2 ♀♀; Moosonee, 51.24466°N 80.67767°W, Repl. 2 mesic, Malaise trap, 21–24.vi.2010, 1 ♂, NBP Field Party leg. ( LEMQ); Moosonee, 51°14.75'N 80°40.33'W, sweeps, mostly Rubus, Ribes, under Populus, 9.vii.2014, 1 ♀; Moosonee, 51°14.79'N 80°40.35'W, 9.vii.2014, sweeps, mostly Solidago, Calamagrostis, 1 ♀; Moosonee, 51°16.33'N 80°39.11'W, sweeps, mostly Rubus, Impatiens, under Salix, Alnus, 10.vii.2014, 2 ♂♂ 5 ♀♀; Moosonee, 51°16.36'N 80°39.11'W, sweeps, railside ditch, mostly Equisetumssuviatile, Carexspp., 11.vii.2014, 1 ♀, all K. N. Barberleg. (all CNCI); Ottawa, 15.vii.1957, 1 ♀(genit. prep.), J. E. H. Martin leg., 30.vi.1963, 1 ♀, J. R. Vockeroth leg. ( CNCI); S[ault] S[te.] Marie, S of Algoma U[niversity] College, 46°29.9'N 84°17.2'W, sweeps, Impatiensunder Populus/ Betula, 13.vii.1998, 1 ♂ 1 ♀( ♀genit. prep.); S[ault] S[te.] Marie, Baseline Rd., 46°31.40'N 84°24.45'W, sweeps, edge of forest, Solidago, Rubus, Equisetum, grasses, 25.vi.2005, 1 ♂, all K. N. Barber leg. (all CNCI); Sault Ste. Marie, Baseline Road, 46°31.40'N 84°24.40'W, sweeping Aster[ Doellingeria], Rubus, Equisetum, Carex, Clematis, ferns under aspen( Populus), 7.vii.2010, 2 ♂♂ 2 ♀♀( 2 ♂♂ 1 ♀genit. prep.), 12.vii.2010, 1 ♂(genit. prep.), J. Roháček leg. ( SMOC); S[ault] S[te.] Marie, Baseline Rd., 46°31.40'N 84°24.40'W, Malaise #1, Aster[ Doellingeria], Rubus, Equisetum, Carex, Solidago, in aspenclearing, 8–18.vii.2005, 1 ♀, sweeps, Aster[ Doellingeria], Rubus, Equisetum, Carex, ferns under aspen, 25.vi.2005, 2 ♂♂, 26.vi.2005, 1 ♂ 2 ♀♀, 22.vii.2010, 1 ♀( CNCI), 19.vi.2011, 1 ♂ 2 ♀♀( INHS), 29.vii.2012, 2 ♀♀, sweeps, mostly ferns under aspen, 19.vi.2011, 3 ♂♂ 2 ♀♀( LACM), 27.vii.2012, 1 ♂ 3 ♀♀( 1 ♀genit. prep.), 28.vii.2012, 2 ♂♂ 1 ♀( 1 ♂genit. prep.), 29.vii.2012, 2 ♀♀( CNCI), K. N. Barber leg.; S[ault] S[te.] Marie, Birchwood Pk., mixed forest, 15.vi.1986, 1 ♂( MCZC), 28.vi.1986, 1 ♂, 6.vii.1986, 1 ♂( CNCI); same locality but 46°30.7'N 84°15.6'W, sweeps, mostly Impatiens, under Betula/ Acer, 19.vi.1998, 3 ♀♀( 1 ♀genit.prep.), 23.vi.1998, 1 ♀, sweeps, Impatiens, under Betula/ Acer, 27.vi.1998, 1 ♀(genit. prep.), sweeps, graminoids, Impatiens, ferns under Betula/ Acer, 17.ix.2004, 1 ♀; same locality but 46°30.67'N 84°15.63'W, sweeps, Rubus, Aralia, graminoids, ferns, under Betula/ Acer, 29.vi.2008, 1 ♂, sweeps, mostly Impatiens, fern, Aster[ Eurybia], 23.viii.2009, 1 ♂(all CNCI), all K. N. Barber leg.; S[ault] S[te.] Marie, Bristol Place, 28.vi.1987, 1 ♀, 1.vii.1987, 1 ♂, K. N. Barber leg. ( CNCI); S[ault] S[te.] Marie, Bristol Pl[ace] Pk., 46°30.8'N 84°16.6'W, sweeps, Impatiensunder Betula/ Acer, 9.vii.1998, 1 ♂ 1 ♀, sweeps, Clematis, Rubus, Impatiens, grasses, 28.v.1999, 1 ♂, sweeps, mostly Impatiens, Clematis, Rubus, grasses, 11.vi.1999, 2 ♂♂( CNCI); same locality but 46°30.77'N 84°16.66'W, sweeps, Impatiens, Clematis, Equisetum, Rubus, ferns, Phalaris, 29.vi.2008, 2 ♂♂ 3 ♀♀( CASC), 30.vi.2008, 1 ♂ 1 ♀( MCZC), 1. vii.2008, 2 ♀♀, 4.vii.2008, 6 ♂♂ 2 ♀♀( 1 ♂wing illustration, one pair in copula), 5.vii.2008, 1 ♂ 2 ♀♀( CNCI), 9.vii.2008, 2 ♂♂ 3 ♀♀( DEBU, 1 ♀genit. prep.), 11.vii.2008, 7 ♂♂ 3 ♀♀( 1 ♀genit. prep.), 13.vii.2008, 1 ♀, 27.vii.2009, 1 ♂ 5 ♀♀( CNCI), 21.vii.2014, 1 ♂ 1 ♀( SMOC), all K. N. Barber leg.; S[ault] S[te.] Marie, Finn Hill, 46°31.6'N 84°17.4'W, sweeps, vegetation under Populus, 4.vii.2002, 1 ♀; S[ault] S[te.] Marie, Fish Hatchery Road, along Coldwater Ck., 46°34.33'N 84°17.23'W, sweeps, trailside Clematis, Eutrochium, 17.vi.2010, 1 ♂; S[ault] S[te.] Marie, Florwin Dr. greenbelt, 46°30.3'N 84°17.2'W, sweeps, Impatiensunder Acer/ Betula, 23.vi.1999, 1 ♀; S[ault] S[te.] Marie,Sault Coll[ege] Woodlot, 46°32.08'N 84°18.25'W, sweeps, Clintonia,ferns, under Acer, 31.v.2010, 1 ♂, all K. N. Barber leg. (all CNCI). QUEBEC:Abbotsford, 4.vi.1937, 1 ♂, G. E. Shewell leg.; Beechgrove, 7. vi.1955, 1 ♀, J. F. McAlpine leg.; Beechgrove, 45°39'N 76°08'W, 29.vi.1962, 1 ♂, J. R. Vockeroth leg.; Bolton Pass, Knowlton, 800', 5.vi.1963, 1 ♂, J. G. Chillcott leg. (all CNCI); 1.2 km E Bristol, Silver Creek, 45°31'N 76°27'W, noodplain meadow, 5.vi.1996, 1 ♀, L. Dumouchel leg. ( LEMQ0040277); Gatineau Pk., Harrington Lk., 3.vii.1963, 1 ♂, J. R. Vockeroth leg.; Lac Roddic, 16 kmS Maniwaki, 23.vi.1991, 1 ♂ 1 ♀, M. Barták leg. ( MBPC, both genit. prep.); Magog, 1.vi.1965, 1 ♀, D. M. Wood leg. (genit. prep.); Old Chelsea, 18.vi.1963, 1 ♂, J. R. Vockeroth leg. (genit. prep.); Old Chelsea, King Mt., 26.v.1963, 1 ♂, J. G. Chillcott leg.; Wakeneld, 26.vi.1946, 1 ♀, 9.vii.1946, 1 ♀, G. E. Shewell leg. (all CNCI). SASKATCHEWAN:Kenosee, 7.vi.1958, 2 ♂♂ 7 ♀♀; Saskatoon, 9.vii.1951, 1 ♀, all A. R. Brooks leg. (all CNCI). UNITED STATES OF AMERICA: CONNECTICUT:Canaan, 17.viii.1952, 1 ♀, A. Stone leg.; Redding, 8.vi.1928, 1 ♀(genit. prep), A. L. Melander leg. (both USNM). ILLINOIS:Savanna, 13.vi.1917, 1 ♂, [no collector] ( INHS40,188). INDIANA:Lafayette, 24.v.1917, 1 ♂, J. M. Aldrich leg. ( USNM). MARYLAND:Bethesda, 14.viii.1981, 1 ♀, G. C. Steyskal leg. ( USNM); Montgomery Co., Bethesda, 5.v.1968, 3 ♂♂, L. V. Knutson leg., 26.v.1968, 1 ♂, G. Steyskal leg.; Cabin John, 21.vii.1921, 1 ♂, J. R. Malloch leg. (Malloch det. as A. tenuis); Montgomery Co., Dickerson, 14.vii.1974, 1 ♂(genit. prep.), G. A. Foster leg.; Glen Echo, 23.vii.1922, 1 ♂, J. R. Malloch leg.; Lavale, 9.v.1970, 1 ♂(genit. prep., left wing and apical half of right wing missing), G. Steyskal leg. (all USNM); Plummers Is., 12.v.1907, 1 ♂, W. L. McAtee leg. (with det. as A. tenuis), 9.viii.1909, 1 ♀(genit. prep.), Barber & Schwarz leg., 28.vii.1912, 1 ♀, H. L. Viereck leg., 5.v.1914, 1 ♂, 10.v.1914, 1 ♂, at light, 13.vi.1914, 1 ♀(genit. prep.), R. C. Shannon leg., Malaise trap, 8–20.vii.1968, 1 ♂(genit. prep.), Paul Spangler leg. (all USNM). MASSACHUSETTS:Franklin Co., ~0.5 km E Farley, 42°36.16'N 72°25.94'W, sweeps, asters, ferns, Impatiens, Rubus, under canopy, 26.vii.2006, 2 ♂♂ 3 ♀♀, K. N. Barber leg. ( CNCI, 1 ♀genit. prep.); Middlesex Co., Lincoln, Malaise trap, 4–8.vi.1952, 1 ♀, E. T. Armstrong leg. ( USNM, genit. prep.). MICHIGAN:Hillsdale Co., 21.v.1960, 1 ♂, R. & K. Dreisbach leg. ( USNM). MINNESOTA:Itasca Pk., 12.vii.1952, 1 ♂, [no collector] ( AMNH). NEW HAMPSHIRE:Mt. Washington, 18.vii.[-], 1 ♀, C. W. Johnson leg. ( MCZC). NEW YORK:Bemus Pt., Chautauqua Lk., swampy woods, 31.v.1963, 1 ♀, W. W. Wirth leg. ( USNM); Ithaca, 24.v.1900[?], 1 ♂, [no collector] ( AMNH, genit. prep., wings in genit. vial); New York, 31.v.1923, 1 ♂, A. H. Sturtevant leg.; Tompkins Co., Ringwood Res., swamp, 16–17.vi.1963, 1 ♀, W. W. Wirth leg.; Rome, 24.vi.1935, 1 ♀, H. K. Townes leg. (all USNM); Whiteface Mt., 4600–4872', 19.vii.1962, 1 ♂, J. R. Vockeroth leg. ( CNCI). NORTH CAROLINA:Buncombe Co., Blue Ridge Pkwy. at Craggy Gardens, 35.70°N 82.39877°W, 5400', sweep forest path and clearing, 17.viii.2007, 1 ♀, T. A. Wheeler leg. ( LEMQ); Swain Co., Rte 441, 3 miN Cherokee, Great Smoky Mountains National Park, 35°31.3'N 83°18.5'W, 2000', 27.v.1999, 1 ♀, S. D. Gaimari leg. (99-5, Nat’l Pk. Svc. Permit #GRSM-99-074) ( USNM). ENNSYLVANIA:Dauphin Co., Grantville, 24.v.1962, 1 ♀, J. R. Vockeroth leg. ( CNCI, genit.prep.); Roxborough, 23.v.1909, 1 ♀, [no collector] ( USNM, genit. prep.). VIRGINIA:Bland Co., Brushy Mt. at Rd. 623, 37.05229°N 81.30209°W, sweep forest edge, 15.viii.2007, 6 ♂♂ 5 ♀♀, J. Mlynarek leg., 4 ♂♂ 1 ♀( LEMQ0040768–72, 1 ♂genit. prep.), T.A. Wheeler leg., 1 ♂( LEMQ0040310, genit. prep.), A. MacLeod leg.; Chain Bridge, 7.v.1922, 1 ♀(genit. prep.), 20.viii.1922, 1 ♀, 14.v.1924, 1 ♂, J. R. Malloch leg.; Fairfax Co., Dead Run, 28.vii.1915, 1 ♂ 1 ♀, R. C. Shannon leg. ( ♀genit. prep.); Falls Church, Holmes Run, light trap, 24.viii.1960, 1 ♀, W. W. Wirth leg. (all USNM); Page Co., G.Washington N. F., Gap Creek Trail, 38.70764°N 78.56077°W, 1662', sweep forest path at creek, 19.viii.2007, 1 ♀, J. Mlynarek leg. ( LEMQ0040534); Great Falls, “ 12-vi”, 1 ♀, N. Banks leg. ( MCZC); Giles Co., Mountain Lake Biol. Stn., 37°22'31"N 80°31'18"W, sweep nr. station, 20.v.2005, 1 ♂, S.A. Marshall leg. ( DEBU00252870); near Plummers Island, MD[Maryland], at light, 20.v.1914, 1 ♀(genit. prep.), R. C. Shannon leg. ( USNM); Shenandoah N. P., mi. 65–100, sweeps, 29.v.1979, 2 ♂♂, M. J. Sharkey leg. ( DEBU); Hawksbill Gap, Shenandoah N. P., 1600 m, 17.viii.1981, 1 ♂ 1 ♀, J. R. Vockeroth leg. ( CNCI); Shenandoah Co., Mt. Jackson, 25.v.1962, 1 ♂ 1 ♀, J. G. Chillcott leg., 2 ♂♂, J. R. Vockeroth leg. ( CNCI); Tazewell, Burkes Garden, Sta[tion] Spr[in]g, 37°05.9'N 81°22.4', 960 m, 18.v.2005, 4 ♂♂, W. N. & D. Mathis leg. ( USNM). WEST VIRGINIA:Grant Co., Dahle Soda, 13. vi.1986, 1 ♂, A. L. Norrbom leg. ( USNM). Other material examined (not included in type series).Provenance unknown, “Loew Coll.”, “Type 13427” (red label), 1 ♀, ( MCZC, genit.prep., erroneously labelled a syntypeof Anthophilina tenuisLoew). CANADA: ONTARIO:Moosonee, 51°16.33'N 80°39.11'W, sweeps, mostly Rubus, Impatiens, under Salix, Alnus, 10.vii.2014, 1 ♀, K. N. Barber leg. ( CNCI, deformed postabdominal tergites); S[ault] S[te.] Marie, Bristol Pl[ace] Pk., 46°30.77'N 84°16.66'W, sweeps, Impatiens, Clematis, Equisetum, Rubus, ferns, Phalaris, 21.vii.2014, 3 ♂♂, K. N. Barber leg. ( SMOC, used for molecular work). SASKATCHEWAN:Kenosee, 7.vi.1958, 1 ♀( CNCI, headless, genit. prep.). UNITED STATES OF AMERICA: NEW HAMPSHIRE:“N.H.”, “205”, “Loew Coll.”,“ Type14558” (red label), 1 ♀( MCZC, headless, double mount with a ♀of Arganthomyza duplexon the same pinned bricket, erroneously labelled as typespecimens of Anthophilina terminalisLoew). NEW YORK: DelawareCo., Franklin Mtn. nr. Oneonta, 3.vii.1980, 1 ♀, D. J. Bickel leg. ( MCZC, head glued to pin, genit. prep.). Other A. macragroup material of questionable identity( Anthomyzasp. cf. oblonga). CANADA: ONTARIO:S[ault] S[te.] Marie, Baseline Rd., 46°31.40'N 84°24.40'W, sweeps, Aster[ Eurybia], Rubus, Equisetum, Carex, ferns, under aspen, 8.viii.2005, 1 ♀(genit. prep.); S[ault] S[te.] Marie, Birchwood Park, mixed forest, 28.vi.1986, 1 ♀(genit. prep.), both K. N. Barber leg. (both CNCI). UNITED STATES OF AMERICA: PENNSYLVANIA:Dauphin Co., Grantville, 24.v.1962, 1 ♀, J. R. Vockeroth leg. ( CNCI, genit. prep.).
Description. Male.Total body length 2.02–2.66 mm. Externally extremely similar to A. tenuisincluding colouration and chaetotaxy, thus body bicolourous and sparsely pale grey microtomentose as in the latter species. Head shape as in A. tenuis, about as long as high. Colouration of head practically identical with that of the latter species including microtomentose pattern of all its parts. Also mouthparts very similarly coloured. Cephalic chaetotaxy as in A. tenuis, only pvt somewhat longer (usually slightly longer than half length of vti), 3–4 (usually 3) pairs of medial microsetulae in anterior third of frons, 9–10 postocular setulae; vi long as in A. tenuis; subvibrissa weak but usually distinctly longer than anterior peristomal setula. No differences in colour and chaetotaxy of palpus. Eye large and oval as in A. tenuis, with longest (oblique) diameter 1.3–1.4 times as long as shortest. Gena higher than that of A. tenuis, about 0.12 times as long as shortest eye diameter. Also antenna (including arista) as in the latter species although whitish marginal cilia on 1st nagellomere slightly longer. Thorax dark brown dorsally and yellow laterally and ventrally as in A. tenuisbut the pattern is yet more variable. In lightest specimens the yellow is extended not only on humeral and notopleural areas but also on lateral sides of mesonotum (up to supralar seta); even disc of scutellum is broadly yellow leaving only its sides brownish. In darkest specimens, on the contrary, humeral callus and a band across dorsal margin of mesopleuron and pteropleuron are also brownish, in addition to darkened laterotergite, mediotergite, subscutellum and scutellum. Intermediates between these extremes are frequent. Thoracic chaetotaxy: hu, npl(s), prs, sa and pa as in A. tenuis; also both (postsutural) dc similar; 5–6 dc microsetae in front of anterior dc, the hindmost only slightly longer than others; ac microsetae less numerous than in A. tenuis, normally in only 2 rows on suture (plus a few single microsetae laterally to them), usually ending slightly behind anterior dc, only rarely reaching up to posterior dc; 2 sc and 2 stpl as in A. tenuisbut upcurved setulae on sternopleuron more numerous (4–5) and differently arranged, in more or less perpendicular row with most dorsal setulae longer and situated almost between stpl macrosetae; no setula in front of anterior stpl. Scutellum formed as in A. tenuisbut usually paler on disc medially, sometimes largely yellow (see above). Legs yellow as in A. tenuis, with only distal third to half of apical segment of all tarsi brownish. f 1with ctenidial spine about as long as maximum width of t 1; other pedal chaetotaxies as in A. tenuis. Wing ( Fig. 223) closely resembling that of A. tenuis, with hyaline pale ochreous brown membrane and ochreous veins. Venation as in A. tenuis, only with r-m sometimes situated in middle of cell dm, and terminal section of CuA 1slightly to distinctly longer than dm-cu. Wing measurements: length 2.30–2.74 mm, width 0.79–0.97 mm; Cs 3: Cs 4= 1.48–1.84, rm\ dm-cu: dm-cu = 1.95–2.79. Haltere yellowish white, knob often lighter. Abdomen colouration and structures very similar to those of A. tenuis. Preabdominal terga brown to pale brown (sometimes slightly paler dorsomedially), distinctly lighter than mesonotum or epandrium. T1 concolourous or slightly paler than T2. T2–T5 as in A. tenuis. Preabdominal sterna somewhat wider than in A. tenuis, pale yellow and with denser setosity. S1 as in A. tenuis, S2–S5 slightly to distinctly wider than long, becoming wider and more transverse posteriorly; S5 the largest and widest, posteriorly distinctly widened. T6 as in A. tenuisbut somewhat longer, seemingly bipartite, with dorsomedial unpigmented part narrower. S6–S8 dorsally fused and more or less asymmetrical as usual. S6 and S7 ochreous to yellow in pale specimens, brown and concolourous with T 5 indark ones, with anterior ledge-like margins always darker brown. Both S6 and S7 usually with more setulae (S6 with 3–5, S7 with 2–4). S8 long, brown to pale brown as T5 or (in pale specimens) with lightened marginal areas. Genitalia. Epandrium ( Figs 225, 226) very broad as in A. tenuisbut smaller, with similar chaetotaxy, usually with setae denser laterally; anal nssure higher (longer) and cercus slightly larger (compared to epandrium) than in A. tenuis. Medandrium distinctly higher, with dorsolateral corners small ( Fig. 225). Gonostylus ( Figs 225, 226, 231) distinctive, dissimilar to those of all relatives, roughly suboblong, relatively narrow but with outer side convex, with both distal corners more or less angular, setose only on inner side and externally largely micropubescent, with only anterior marginal band bare ( Fig. 226). Hypandrium ( Fig. 227) as in A. tenuisbut more robust anteriorly. Transandrium ( Fig. 228) generally constructed as in relatives, somewhat wider and with terminal arms of caudal process thicker than those of A. tenuis. Pregonite ( Fig. 227) similar to that of A. tenuis, 3 anterior and only 4 posterior setae (latter on short lobe-like process). Postgonite more slender (only when viewed in pronle) than that of A. tenuisand with 1–2 setiform microsensilla below 1 usual seta inserted more proximally at anterior margin ( Fig. 227). Aedeagal part of folding apparatus with the same armature as in A. tenuis; connecting sclerite also similar although somewhat paler and less sclerotized; basal membrane with dense short excrescences more spine-like ( Fig. 227). Phallapodeme more robust, particularly the fulcrum ( Fig. 230). Phallophore as in A. tenuis. Saccus ( Fig. 230) voluminous but somewhat smaller and its membranous distal part with markedly fewer spines than that of A. tenuishence resembling that of A. silvatica. Filum ( Fig. 230) compact ribbon-shaped, largely dark, fading only towards apex which is (in contrast to A. tenuis) parallel-sided with blunt tip ( Fig. 229). Ejacapodeme larger than in relatives ( Fig. 230). Female.Similar to male unless mentioned otherwise. Total body length 2.46–3.21 mm. Cephalic and thoracic setae longer and thicker. Orbit rarely ( 2 specimensseen) with 1–3 additional microsetulae among ors. Antenna with 1st nagellomere only sometimes darker yellow around base of arista. Mesonotum with ac microsetae sometimes more numerous forming up to 4 rows on suture. Ctenidial spine on f 1distinctly longer and thicker, longer than maximum width of t 1. Wing measurements: length 2.73–3.25 mm, width 0.93–1.13 mm; Cs 3: Cs 4= 1.33–1.68, rm\dm-cu: dm-cu = 1.85–2.82. Preabdomen with terga more transverse, bicolourous, typically dorsally largely yellow and laterally brown (cf. Fig. 232). T1 more or less ochreous to pale brown; T2 not only laterally but also anteriorly brownish, otherwise yellow, or (more rarely, in dark specimens) completely pale brown. T3–T5 largely yellow, only laterally (on bent sides) brown, with dark parts sharply contrasting with yellow dorsum of sclerites. More rarely T3–T5 (or only some of them) with dorsal pale areas smaller and ochreous and/or with dorsomedial pale brown spot. Preabdominal sterna pale yellow, narrower than in male but also densely (more than in A. tenuis) setose; S2 and S3 about as long as wide; S4 and S5 wider than long, both slightly transverse. S5 the largest sternum, about as wide as S6. Figs 225–231. Anthomyza oblonga sp. nov., paratype male (Canada: Ontario). 225 – external genitalia, caudally; 226 – the same, laterally; 227 – hypandrial complex, laterally; 228 – transandrium, caudally; 229 – apex of nlum, lateroventrally (widest extension); 230 – aedeagal complex, laterally; 231 – gonostylus,sublaterally (widest extension, micropubescence omitted). Scales = 0.05 mm (Fig. 229) and 0.1 mm (others). Postabdomen ( Figs 234, 238) relatively elongate, extremely similar to that of A. tenuisand, consequently, mainly the differences are stressed below. T6 largely blackish brown but anteriorly with larger yellow marginal area (longest medially, Fig. 234). S6 somewhat smaller (particularly shorter) than in A. tenuis. T7 usually slightly shorter and with more setae, always with sides convex ( Fig. 234) to straight; S7 also very similar, narrow and elongate; enlarged micropubescence of membrane between T7 and S7 somewhat different (cf. Fig. 238). T8 of almost the same shape as that of A. tenuisand with similar sparse micropubescence but sometimes darker, more rarely somewhat shorter and more transverse. S8 hardly different from that of A. tenuis. Genital chamber ( Figs 233, 236) with similar posterior pair of bent sclerites ( Fig. 233), but elongate annular sclerite below them anteriorly more dilated (cf. Fig. 236) and in pronle distinctly more curved ( Fig. 233) than that of A. tenuis; terminal part of genital chamber without distinct plate-like sclerite (or this structure is membranous). Ventral receptacle ( Fig. 233) also closely resembling that of A. tenuisbut with curved terminal end also nnely ringed. Accessory gland vesiculate ( Fig. 233), on distinctly subterminally dilated and partly ringed duct. Spermathecae (1+1) cone-shaped as those of A. tenuisbut terminally more slender and tapered ( Fig. 235) and with short basal part markedly narrower than maximum width of distal part, the latter being more densely transversely striated ( Figs 235, 237); spermathecal ducts as in A. tenuis. T10 ( Fig. 234) shorter and more transverse than that of A. tenuis, otherwise similar to that of latter species; also S10 hardly different ( Fig. 238). Cercus slender, with chaetotaxy as in A. tenuisbut with dorsopreapical seta often longer ( Fig. 234). Discussion.Owing to the highly characteristic suboblong shape of the gonostylus, Anthomyza oblonga sp. nov.is the most distinctive of the Nearctic species of the A. macragroup. In addition, there are several more features in the male genitalia distinguishing it from relatives (particularly from the externally most similar A. tenuis), viz. the larger medandrium, the robust fulcrum of the phallophore, fewer spines in the saccus of the distiphallus and the blunt apex of the nlum. However, in the female sex it might sometimes be very difncult to distinguish it from A. tenuisbecause their postabdominal structures are very similar. The pale specimens of A. oblongacan be easily recognized in having the disc of the scutellum contrastingly yellow but in darker females (with scutellum brownish with or without pale brown medial area) it is necessary to carefully compare other characters, particularly the yellow pattern of the preabdominal terga (more contrasting in A. oblonga), the shape of T7 (laterally convex to straight in A. oblonga), the sclerotization of the genital chamber (shape of annular sclerite) and the form and striation of the spermathecae (see the key). However, despite the above female resemblances (with A. tenuis), A. oblongais probably more closely allied to A. silvaticathan to A. tenuissharing with it the similar armature of the saccus (with spines concentrated more basally near the internal coiled structure) and the more densely striated spermathecae. The E. Palaearctic species A. decolorataRoháček, 2009also shares these characters but further resembles A. oblongain the very projecting posterior corner of the gonostylus, the blunt apex of the nlum (all other species of the group have the nlum apically lanceolate) and the female preabdominal terga strongly desclerotized and depigmented.All these characters are probably apomorphic and may demonstrate a sister-species relationship of the latter pair.
Etymology.The species name is a Latin adjective (oblongus, -a, -um), meaning oblong, to renect the suboblong shape of its gonostylus.
Biology. Anthomyza oblongaand A. silvaticafrequently co-occur in Ontario, Canada. Here, this habitat is the same as that of three or even four (including the recently transferred Arganthomyza vittipennis) eastern species of Arganthomyza(see Figs 69, 149) – mixed vegetation within or on the edge of mesic mixed forest with ferns possibly representing an indicator of appropriate habitat that often has at least a component of Populus tremuloides(in east). A very notable exception is the Ontario: Moosonee site under Salixand Alnuswith no ferns or Populus(in immediate vicinity) and where all three species of the A. macragroup were found with three species of Arganthomyza(see discussion under A. tenuis). Dennitive plant hosts have not been identined for any of these species. Other label references include sweeping in habitats such as “ maple/ elmnoodplain community”, “along fast rocky stream”, “noodplain meadow” and “swamp”. Anthomyza oblongahas been collected as early as 5 May (Maryland: Bethesda & Plummers Island) and as late as 17 September ( Ontario: Sault Ste. Marie – Birchwood Pk.).
Distribution.This is a fairly widely distributed species in the east and not yet known from west of Manitoba. Canada: Manitoba, Newfoundland, Nova Scotia, Ontario, Quebec, Saskatchewan; United States of America: Connecticut, Illinois, Indiana, Maryland, Massachusetts, Michigan, Minnesota, New Hampshire, New York, North Carolina, Pennsylvania, Virginia, West Virginia(see Table 2).
2985226869
2008-07-04
CNCI
J. Rohacek & K. N. Barber
46.512833
Impatiens
11
-84.277664
Bristol Pl. Pk.
126
123
4
2
holotype
2985227086
126
123
paratype
2985226742
126
123
2985225372
126
123
3989375306
126
123
3989375303
48.350834
-84.564
126
123
2985226572
49.183333
-81.266667
126
123
2985225661
46.895
-84.05666
126
123
2985225332
51.24622
-80.67281
126
123
2985226179
51.24466
-80.67767
126
123
2985225733
51.245834
-80.672165
126
123
2985226486
51.2465
-80.6725
126
123
2985225513
51.272167
-80.65183
126
123
2985226098
2014-07-11
CNCI
K. N. Barber
51.272667
Equisetum
11
-80.65183
Moosonee
126
123
1
1
2985225335
126
123
2985226985
46.498333
-84.28667
126
123
2985226016
46.523335
-84.4075
126
123
2985225337
46.523335
-84.40667
126
123
2985225505
46.523335
-84.40667
126
123
2985225326
46.511665
-84.26
126
123
2985225433
127
124
46.511166
-84.2605
126
123
2985226949
46.513332
-84.276665
127
124
2985226886
46.512833
-84.277664
127
124
2985225346
46.52667
-84.29
127
124
2985226525
46.572166
-84.28717
127
124
2985225350
46.505
-84.28667
127
124
2985226942
46.534668
-84.30417
127
124
2985227089
45.65
-76.13333
127
124
2985225484
45.516666
-76.45
127
124
2985226721
127
124
2985225559
127
124
2985226388
127
124
2985226017
[424,982,831,852]
127
124
3989375301
127
124
3989375307
42.602665
-72.432335
127
124
2985226031
127
124
2985225675
[534,1090,1125,1146]
127
124
2985227028
[113,782,1153,1172]
127
124
2985225429
127
124
2985225527
35.7
-82.39877
127
124
2985226641
35.521667
-83.308334
127
124
2985226416
127
124
2985225749
37.05229
-81.30209
127
124
2985226940
38.70764
-78.56077
127
124
2985226214
USA
128
125
37.375275
-80.52167
127
124
2985226794
37.09833
128
125
2985226722
128
125
2985226611
51.272167
-80.65183
128
125
2985226521
46.512833
-84.277664
128
125
2985225483
[445,1042,539,559]
128
125
2985226212
128
125
2985227011
128
125