Phytoliriomyza dorsata (Siebke)

Lonsdale, Owen, 2021, Manual of North American Agromyzidae (Diptera, Schizophora), with revision of the fauna of the " Delmarva " states, ZooKeys 1051, pp. 1-481 : 1

Phytoliriomyza dorsata (Siebke)

Figs 699-704

Agromyza dorsata Siebke, 1864: 169.

Agromyza reverberata Malloch, 1924: 191. Spencer 1969 [synonymy].

Liriomyza striata Hendel, 1931: 249. Spencer 1972 [synonymy?].

Liriomyza reverberata . Frick, 1952a: 375, 1959: 409.

Lemurimyza dorsata . Spencer, 1965b: 28, 1969: 194.

Phytoliriomyza dorsata . Spencer, 1976: 294; Spencer and Steyskal 1986b: 158; Černý et al. 2020: 214.

Description.

Wing length 2.1-2.5 mm (♂), 1.9-2.6 mm (♀). Length of ultimate section of vein M4 divided by penultimate section: 1.2-1.5. Eye height divided by gena height: 3.9-5.0. Eye bare. First flagellomere slightly longer than high, rounded, long axis slightly angled ventrally. Vein r-m near midpoint of cell dm.

Chaetotaxy: One ori; two ors. Orbital setulae erect, in a single row. Postocellar and ocellar setae well-developed. Four dorsocentrals, one presutural, decreasing in length anteriorly. Acrostichal setulae in two long rows, relatively long, posterior pair slightly to distinctly convergent.

Colouration: Head light yellow with first flagellomere dark brownish black, back of head brown above foramen excluding margin, ocellar tubercle yellow to light brown medially with brown margins or extensions to ocelli; face, gena, parafacial and postgena whitish. Thorax with greyish pruinosity distinct on pigmented regions. Scutum yellow with dark medial stripe on anterior 2/3, one pair of presutural spots, and two pairs of postsutural stripes, with outer supra-alar pair small, narrow, and more posterior, and inner intra-alar pair sometimes connected to presutural spot (only fused to postsutural intra-alar stripe in one Ontario female). Scutellum yellow with lateral corner sometimes narrowly brownish grey. Mediotergite dark brown; katatergite and anatergite yellow with venter sometimes narrowly brown. Pleuron yellow, anatergite sometimes with minute, faint anteroventral spot, meron mostly brown, and katepisternum with brown spot not reaching base of seta. Halter entirely white. Calypter margin and hairs brown. Legs light yellow, sometimes with tarsi and tibiae faintly brownish. Abdomen yellow, sometimes with faint dorsomedial stripe and epandrium brownish.

Genitalia: (Figs 699-704 ) Inner surface of epandrium with comb of long, fused tubercle-like setae beside one longer spine; ventral margin with minute tubercle-like setae, widely spaced in straight to irregular row. Surstylus small and rounded with one to three tubercle-like setae posteriorly. Subepandrial sclerite consisting of V-shaped sclerite with one pair of medial setae and flat, pale, ventral bilobed process. Hypandrium thin with one seta and lobe sclerotised only along outer margin. Postgonite bare and broadly rounded apically. Basiphallus with narrow plate on left side (broad apically) and lightly sclerotised anterodorsal margin. Paraphallus absent. Hypophallus broad and membranous with one pair of small, converging sclerites medially and lateral margin very lightly sclerotised. Mesophallus dark, cylindrical, as long as distiphallus. Distiphallus comprised of one pair of stout, elongate tubules that are parallel basally; basal 1/2 composed of dark bulbous sclerite and weaker medial region that is nearly band-like; distal 1/2 cylindrical, pigmented. Ejaculatory apodeme pale and fan-shaped with narrow stalk, broad base, and clear sperm pump.

Host.

Unknown.

Distribution.

Canada: BC*, MB*, NT*, ON, QC*, YT*. USA: CA, LA, MD, MI, PA, VA, WY*. Europe, Russia, Iran, Japan ( Černý et al. 2020).

Type material.

Holotype [dorsata]: Norway. Opland: Jerkin (1♂, ZMUN). [Not examined]

Syntypes [ Liriomyza striata ]: Romania. Mehadia.; Austria. "Ossiacher-See und Dobratsch, Karnten … Donau-Auen bei Wien"; Russia. Leningrader Bezirk (7♂♀, NMW). [Not examined]

Holotype [reverberata]: USA. MD: Glen Echo, 14.v.1922, J.R. Malloch (1♀, [Lost]).

Paratype [reverberata]: USA. MD: same collection as holotype (1♀, CNC). [Not examined]

Additional material examined.

Canada. BC: Kinbasket Lake , 17-18.vii.2009, Cooper Beauchesne and Assoc. Ltd., Malaise trap, BC Hydro drawdown study (12MTRT15), CNC479993 (1♀, CNC), MB: Shilo , 5mi SW, tamarack, 2.viii.1958, J.G. Chillcott, CNC479997 (1♀, CNC), Western MB, Riding Mountain Nat. Park , Clear Spring spruce bog, 50°41'N, 99°48'W, 650 m, 10.vii.2008, J. Crossey, N. Jeffery, J. Straka, CNC391899, CNC391900 (2♂, CNC), NT: Norman Wells, 25.vi.1969, G.E. Shewell, CNC479991 (1♂, CNC), Wood Buffalo National Park, Benchmark weather station, 59°34'N, 112°16'W, 219 m, aspen stand, 27.vii.2012, N. Labine, CNC391901 (1♀, CNC), ON: Ottawa, Dow’s Swamp, 5.vii.1947, CNC391902 (1♂, CNC), Ottawa, 17.vi.1946, G.E. Shewell, CNC391903 (1♀, CNC), 18.vi.1957, J.G. Chillcott, CNC479999, CNC480000 (2♀, CNC), damp second growth Acer - Betula wood, 5.vii.2000, J.R. Vockeroth, CNC479998 (1♀, CNC), QC: Cap Rouge, 4.vii.1953, R. Lambert, CNC479994 (1♀, CNC), Old Chelsea, 18.vii.1961, J.R. Vockeroth, CNC479995 (1♀, CNC), 30.vi.1985, CNC479996 (1♀, CNC), YT: Dawson, 14 mi E, 396 m, 31.vii.1962, P.J. Skitsko, CNC479992 (1♂, CNC) . USA. LA: Alexandria , 11 mi SW, 26.iii.1960, J.G. Chillcott, CNC391904 (1♀, CNC), VA: Giles Co., Stony Creek, 609 m, 26.v.1963, J.R. Vockeroth, CNC391905 (1♀, CNC), Shenandoah, vii.1939, A.L. Melander (1♂, USNM), WY: Sierra Madre Range, Battle L. Road, 2438 m, on side of stream, 18.vii.1961, J.G. Chillcott, CNC479990 (1♂, CNC) .

Comments.

Phytoliriomyza dorsata is distinct among the known Delmarva species, but it is highly similar to P. pacifica (Melander) ( Spencer and Steyskal 1986b: figs 1006, 1007), which occurs from Ontario to Saskatchewan in Canada, and Washington and Idaho in the United states, but is likely more widespread. Externally, P. pacifica differs in having the scutal stripes confluent, or at least connected by a brownish orange infuscation (not with medial and postsutural supra-alar stripes discrete), the anepisternum has an anteroventral spot that is longer than high (not absent to minute), the tibiae and tarsi are brown, at least on the hind leg (not yellow to faintly brownish). With regard to the male genitalia, the ventral margin of the epandrium has one or two minute tubercle-like setae (not several widely spaced in a straight to irregular row), the surstylus has one spine (one to three in P. dorsata ), and the distiphallus is diverging basally and with a dark basal section that is relatively long and narrow (not parallel with dark basal section shorter and rounded).

Figures

Figures 699 - 704. Phytoliriomyza dorsata (Siebke), male genitalia 699 external genitalia, ventral (subepandrial sclerite shaded) 700 external genitalia, posterior 701 external genitalia, left lateral 702 hypandrium and postgonite, ventral 703 hypandrial complex, left lateral 704 phallus, ventral.