Dasysyrphus pacificus (Lovett)

Locke, Michelle M. & Skevington, Jeffrey H., 2013, Revision of Nearctic <i> Dasysyrphus </ i> Enderlein (Diptera: Syrphidae), Zootaxa 3660 (1), pp. 1-80: 55-58

publication ID

http://dx.doi.org/10.11646/zootaxa.3660.1.1

publication LSID

lsid:zoobank.org:pub:95ADD39C-98BE-4879-B070-34A5D86BD67B

persistent identifier

http://treatment.plazi.org/id/03893F32-FF85-FF98-FF46-FC80FBB18E78

treatment provided by

Felipe

scientific name

Dasysyrphus pacificus (Lovett)
status

 

Dasysyrphus pacificus (Lovett)  

Figures: 13A–D, 21C

Synonyms and References:

Syrphus pacifica Lovett 1919: 245   (in ( Cole & Lovett 1919); original description)

Metasyrphus pacifica (Lovett)   :

Fluke 1933: 116 (key, redescription and transfer to Metasyrphus   )

Dasysyrphus pacificus (Lovett)   :

Stone et al. 1965: 564 (catalogue and transfer to Dasysyrphus   )

Dasysyrphus pauxillus (Williston)   :

Vockeroth 1986: 203 (in part; synonymy)

Vockeroth 1992: 68 (in part; key and redescription)

Diagnosis: Abdominal maculae of tergites 3&4 slightly arcuate, uniform in thickness and do not cross abdominal margin ( Figs 13A & B View FIGURE 13 ); very similar in appearance to D. pauxillus   ( Fig. 14A View FIGURE 14 ), D. nigricornis   ( Figs 11A & B View FIGURE 11 ) and D. laticaudus   ( Fig. 8A View FIGURE 8 ). Wing typically much more bare than any of the three aforementioned species, with cells br and bm with large dense areas ( Fig. 13C View FIGURE 13 ). Male gonostylus with narrow, wavy projection on posterodorsal surface (arrow, Fig. 13D View FIGURE 13 ). Due to an extremely similar habitus, it is difficult to distinguish D. pacificus   from D. pauxillus   . Male genitalia should be used to conclusively identify specimens, especially in the overlap zone of these species’ ranges in southern British Columbia.

Redescription:

Body Length: 5.0– 8.5mm; Wing Length: 5.0– 7.7mm

Head: Frons dark with light pollenose fascia (in males it runs along ventral edge of where eyes meet, in female it is ½ the length between the antennae and ocelli) and dark pile; face light with dark vitta ¼ the width of the face, reaching antennal socket, face with dark pile; gena dark with some light pollen ventral to eye, dark pile dorsally and light pile ventrally; occiput dark, covered in light pollen, pile light with some dark pile dorsally; scape, pedicel and flagellomere light to dark.

Thorax: Scutum dark, may appear shiny or metallic, pile light; scutellum light to dark with darker anterior and lateral edges, light pile with some dark pile posteriorly; wing cell br bare above spurious vein and usually on basal half, bm bare medially or basal half, cells c and r 1 bare at base or with at least small bare areas at base, cup call has small bare areas along vein CuP, wing less frequently completely microtrichose ( Fig. 13C View FIGURE 13 ); haltere light to dark; pro- and mesofemora ⅓–½ dark basially, ½–⅔ light apically, metafemur ⅔–¾ dark basially, ¼–⅓ light apically, tibiae light, metatibia with dark band ¼ of the way from the apex, tarsi light, sometime dark anteriorly.

Abdomen: Maculae on tergite 2 large, slender and oval, ⅓–½ width of tergite, maculae on tergites 3&4 are slightly arcuate, uniform in thickness, with out a distinct swelling medially, maculae do not reach abdominal margin ( Figs 13A & B View FIGURE 13 ); sternites light with dark fasciae.

Male Genitalia: Surstylus more or less triangular in shape in lateral view, flattened posteriorly, long pile on dorsal, laterodorsal and posterodorsal sides, row of spines on posteromedial edge; cercus oval with long pile over entire surface; gonostylus triangular-shaped with narrow, wavy projection on posterodorsal surface projecting posterodorsally, pile on dorsal surface; basiphallus elongate, basally bent at 90 degree angle towards dorsum, apical end curved ventrally with a widened apex and is partly membranous dorsally, with spines on posterodorsal side; distiphallus elongate, apical end flared out into horn, which is mostly sclerotized but membranous at apex with few minute setulae dorsally, basally bent towards dorsum and usually greatly enlarged at bend with a triangular projection, projecting ventrally ( Fig. 13D View FIGURE 13 ).

Intraspecific variation: Distiphallus sometimes without triangular projection basally. Abdominal maculae on tergites 3 & 4 rarely meet medially, and if so, barely touch.

Etymology: Pacificus is Latin for peaceful or peace-making, but more probably was named so because this species is found along the Pacific coast of North America.

Distribution: Southwestern USA (CA, NV, OR, WA) and southwestern Canada (BC); Cascades and Sierra Nevada Mountain Ranges   ( Fig. 21C View FIGURE 21 ).

Ecology:

Collected from April-July, but more commonly in May and June, at elevations of 475–3100m. Recorded from willow ( Salix Linnaeus   , Salicaceae   ) and bitterbush ( Purshia de Candolle ex Poiret   , Rosaceae   ).

Discussion: Dasysyrphus pacificus   is hereby resurrected from synonymy with Dasysyrphus pauxillus   (synonymized by Vockeroth (1986)). The type specimen of this species could not be examined as it is out on loan to another individual. However, based on the written description and distribution of D. pacificus ( Cole & Lovett 1919)   the authors are confident that the individuals examined were of this species. The range of pacificus   is from southern British Columbia, south to California   , in the Cascades and Sierra Nevada mountain ranges   . The type specimen is from Oregon, where it is the only species of the pauxillus   s.l. in this range.

Type Material: “ Holotype (No. 502), male, in Museum of the California   Academy of Sciences, collected at Corvallis, Ore., May 17, by A. L. Lovett” ( Cole & Lovett 1919). (not examined)

Material Examined:

Canada: British Columbia: Bear Mountain , [49.300555, -121.740556], 6.v.1920, ♂, CNCD 13743, ( CNC). EAST KOOTENAY R GoogleMaps   . D.: Cranbrook , [49.517983, -115.761504], 19.v.1920, ♂, CNCD 13748 GoogleMaps   , C.B.D. Garrett ( CNC); 27.iv. ♂, RBCM ENT 99188108 View Materials   , H. R. Foxlee ( RBCM). 7 miles N Lions Bay, North of Vancouver , 18.v.1979, ♂, CNCD 5464   , G.F. Hevel ( USNM)   . United States of America: California: RIVERSIDE CO.   : Dark Canyon N of Idyllwild, [33.81666667, -116.7166667], 24.v.2003, CNCD 8472 GoogleMaps   , J. Skevington ( CNC). SAN BERNARDINO CO   .: Upper Santa Ana River , [34.091253, -117.120741], 3.vi.1947, ♀, CNCD 26415 GoogleMaps   , G.H. & J.L. Sperry ( CNC). 1 km NW Wrightwood, Big Pines Hwy, [34.38138889, -117.6716667], 1974m, 21–28.v.2005, 5♂, JSS 20974 View Materials , 20976–20978, 20980, 2♀, JSS 20975 View Materials , 20979, A. R GoogleMaps   . Cline & S.L. Winterton ( MHPC). Oakhurst , [37.328, -119.649315], 1.vi.1942, ♀, JSS 20598 View Materials , E.C. Linsley ( EMEC). TUOLUMNE CO GoogleMaps   .: Mather Site, Buck Meadows , [37.880173, -119.856977], 1970, ♂, CNCD 26437 GoogleMaps   , 4♀, CNCD 26404–26407 GoogleMaps   , A. R. Moldenke ( CNC). MARIN CO   .: Lily Pond, Alpine Lake , [37.953803, -122.634977], 457m, 25.v.1970, ♀, CNCD 26414 GoogleMaps   , 11.iv.– 25.v.1971, ♂, CNCD 26344 GoogleMaps   , D.D. Munroe ( CNC). CALAVERAS BIG TREES   SP: S. grove, banks of Beaver Creek , MT#2   , [38.26166667, -120.2577778], 1375m, 22.v.–11.vi.2007, 6♀, JSS 20966 View Materials –20970, 20972, A. R GoogleMaps   . Cline & P.H. Kerr ( MHPC). INDIAN GRINDING ROCK   SP: dry wash nr. S. Nature Trail MT #2   , [38.41666667, -120.6333333], 715m, 5.iv.–24.iv.2007, JSS 20981 View Materials , ♀, JSS 20992 View Materials , P. Kerr & M. Hauser ( MHPC); firebreak nr. envtl camp MT3 GoogleMaps   , [38.41861111, -120.635], 715m, 24.iv.2007 24.v.2007, ♀, JSS 20971 View Materials , P. Kerr & M. Hauser ( MHPC). Sonora Pass, [38.53666667, -119.6855556], 3100m, 21.vi.2007, ♀, JSS 20963 View Materials , S.M. Blank ( MHPC). Wright’s Lake, [38.84913, -120.2318], 2.vii.1948, ♂, JSS 20597 View Materials , D. Carter ( EMEC); 2.vii.1948, ♀, JSS 20601 View Materials , L.W. Quate ( EMEC). Placer County, [39.090423, -120.803069], 1524m, iv, ♀, JSS 19511 View Materials , W.M. Davidson ( CNC). Tahoe City, Alpine Meadow Road Jenkinson Reservoir, [39.42138889, -120.3333333], 2200m, 14.vi.2007, ♂, JSS 20957 View Materials , ♀, JSS 20958 View Materials , S.M. Blank ( MHPC). Sinkyone Wilderness State Park , [39.83583333, 123], 28m, 23.iii.2003, ♂, JSS 20797 View Materials , J. & A. Skevington ( CNC). PLUMAS CO GoogleMaps   .: Buck’s Lake , [39.890961, -121.185778], 13.v.1949, ♀, CNCD 26409 GoogleMaps   , P.D. Hurd ( CNC), 4♂, CNCD 26432–26435   , ♀, CNCD 26410   , W.W. Middlekauff ( CNC); 23.vi.1949, 2♀, CNCD 26412   , D. Cox ( CNC), ♀, CNCD 26413   , J.W. MacSwain ( CNC); 13.v.1949, ♂, JSS 20594 View Materials , E.O. Essig ( EMEC), ♂, JSS 20595 View Materials , ♀, JSS 20603 View Materials , P.D. Hurd ( EMEC); 23.vi.1949, 2♀, JSS 20599 View Materials , 20600, J.W. MacSwain ( EMEC). TEHAMA CO   .: 60 kilometers North East of Chico on Road 32, [40.19611111, -121.5213889], 1100m, 15.v.2010, JSS 25002 View Materials , 25003, 25005–25009, D. Striley, M. Hauser ( CSCA). LASSEN CO GoogleMaps   .: Susan River Campground , [40.492316, - 121.094484], 9.vii.1949, ♀, CNCD 26411 GoogleMaps   , A. T. McClay ( CNC). SHASTA CO   .: Viola , [40.517921, -121.680971], 19.v.1941, ♂, CNCD 26436 GoogleMaps   , ♀, CNCD 26408 GoogleMaps   , E.G. Linsley ( CNC). LASSEN NATIONAL PARK   : Manzanita Lake, [40.534513, 121.56655], 8.vi.1941, ♀, JSS 20596 View Materials , C.D. Michener ( EMEC), ♀, JSS 20602 View Materials , Arthur J Walz ( EMEC). Ryan Creek , 17.v.1938, ♀, CNCD 106796 GoogleMaps   , N.F. Hardman ( CNC). San Bernardino Mountains; Up Sta. Ana River, 15.vi.1955, ♀, JSS 23775 View Materials ; 1957, ♀, JSS 26926 View Materials , A.L. Melander ( USNM). Nevada: WASHOE CO.   : Little Valley , [39.806851, -119.951585], 4.vi.1981, JSS 25100 View Materials , R GoogleMaps   . W. Rust ( EMUS). Oregon: KLAMATH CO   .: Lake of the Woods , [42.368634, -122.208482], 22.vi.1975, JSS 25082 View Materials –25086, 25088–25095, G.F. Knowlton ( EMUS), ♀, CNCD 5457 GoogleMaps   , G.F. Knowlton ( USNM); Summit Lake , [43.454905, -122.118766], 7.vii.1952, ♂, CNCD 26442 GoogleMaps   , E. R. Jaycox ( CNC). DESCHUTES CO   .: Camp Abbot , [43.874555, -121.435449], 4.vi.1944, ♀, CNCD 26401 GoogleMaps   , P.H. Arnaud ( CNC). Bellfountain , [44.363611, -123.355278], 27.v.1922, ♂, OSAC 133389 View Materials , 133391 View Materials GoogleMaps   , A.L. Lovett ( OSAC). BENTON CO   .: Corvallis , [44.564564, -123.262033], v.1977, ♂, JSS 19507 View Materials , A.L. Lovett ( CNC) GoogleMaps   .

Washington: WENATCHE NATIONAL FOREST: White Pass Trail , [46.643317, 121.378783], 1345m, 6.vii.2010 GoogleMaps   , CNCD 60054, A. Young ( CNC), ♂   , CNCD 35314, ♀   , CNCD 35313, M.M. Locke ( CNC). Mount Rainier , [46.853048, -121.753127], ♂ GoogleMaps   , CNCD 26429, ♀   , CNCD 26400, 26419, F.M. Hull ( CNC). SAN   JUAN CO.: Olga , [48.619548, -122.835459], 18.v.1910, ♀ GoogleMaps   , JSS 19504 View Materials , ( CNC)   . MOUNT BAKER- SNOQUALMIE NATIONAL FOREST, Picture Lake , [48.866217, 121.676533], 1255m, 8.vii.2010 GoogleMaps   , CNCD 60058, A. Young ( CNC). Price Co.: Pleasant Valley , [48.90667, -122.70333], 21.v.1977, JSS 25097 View Materials GoogleMaps   , T.L. Whitworth ( EMUS)   .

CNC

Canadian National Collection of Insects, Arachnids, and Nematodes

R

Departamento de Geologia, Universidad de Chile

RBCM

Royal British Columbia Museum

USNM

Smithsonian Institution, National Museum of Natural History

CO

Museum National d'Histoire Naturelle

EMEC

Essig Museum of Entomology

CSCA

California State Collection of Arthropods

T

Tavera, Department of Geology and Geophysics

OSAC

Oregon State Arthropod Collection

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Syrphidae

Genus

Dasysyrphus

Loc

Dasysyrphus pacificus (Lovett)

Locke, Michelle M. & Skevington, Jeffrey H. 2013
2013
Loc

Syrphus pacifica

Lovett 1919: 245
1919