Amauromyza karli (Hendel)

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

Amauromyza karli (Hendel)

Figs 86 , 87 , 425-428 , 430

Dizygomyza Karli Hendel, 1927: 253.

Dizygomyza ( Cephalomyza ) Karli. Hendel 1931: 34.

Amauromyza karli . Spencer 1969: 158, 1977: 242.

Amauromyza (Cephalomyza) karli . Gil-Ortiz et al. 2009, Boucher 2012b: 746; Černý 2018: 123; Černý et al. 2020: 201.

Description

(Figs 86 , 87 , 430 ). Wing length 1.7-2.0 mm (♂), 2.0-2.5 mm (♀). Length of ultimate section of vein M4 divided by penultimate section: 1.8-2.3. Eye height divided by gena height: 1.6-1.8. Gena broad, highest posteriorly; cheek distinct. Epistoma at least as long as very narrow clypeus, strongly pointed anteriorly. Fronto-orbital plate and parafacial produced, visible laterally and strongly projecting anteriorly. First flagellomere ~ 1/3 longer than high with anterodistal corner somewhat angulate, sometimes slightly shorter, and more rounded. Lunule height <1/2 width. Distance between cross-veins distinctly longer than dm-m.

Chaetotaxy: Cephalic setae very slender and relatively short. Vibrissa barely larger than genal setae. Three ori; one ors. Orbital setulae short and indistinct to absent, reclinate. Postocellar and ocellar setae slightly longer than ocellar tubercle; setulae on tubercle slender, as long as ocellus. Four to six dorsocentrals; one or two presutural with anterior two short. Acrostichal setulae in 2-4 straight to scattered rows.

Colouration: Setae light brown. Head light yellow with ocellar tubercle and back of head above foramen brown, posterolateral corner of frons with brown spot encompassing vertical setae or just reaching base of inner vertical; base of ors sometimes with brownish spot; clypeus brownish to brown. Thorax dark brown (notopleuron paler) with colour largely obscured by silvery pruinosity. Halter yellow. Calypter white with margin and fringe often lemon yellow, but sometimes slightly brownish. Legs brown with fore coxa light brown, and trochanters, apices of femora (sometimes distal 1/3) and sometimes apices of coxae light yellow; base of tibiae sometimes yellow. Abdomen brown.

Genitalia: (Figs 425-428 ) Hypandrium stout and broadly rounded; inner lobe separated by suture, largely membranous and with several setae on small sclerotised medial plate. Plates of basiphallus short, distinct, approximate. Hypophallus membranous medially and with lateral margins sclerotised. Length of mesophallus ~ 2 × width. Distiphallus very dark, laterally “haired”, C-shaped; entirely split and narrowly divided sagittally; base dorsal, narrower, stem-like; surrounding membrane with minute dark spinules laterally. Ejaculatory apodeme paler to apex, blade gradually narrowing basally to stout stem; sperm pump sclerotised, broad, hemispherical.

Host.

Amaranthaceae - Chenopodium vulvaria ( Gil-Ortiz et al. 2009), C. album *, C. quinoa *.

Distribution.

Canada: AB, BC*, MB, NS*, ON, QC, SK*. USA: MD*. Europe, Mongolia, South Korea ( Černý et al. 2020).

Type material.

Holotype: Poland. "bei Stolp in Pommern ", 9.vii.1924 (1♀, NMW). [Not examined]

Material examined.

CANADA. BC: Yoho N.P., Kicking Horse Cmpgrnd , forested cmpgrnd, 51.4245°N, 116.4294°W, 1317 m asl, BIOBus (1♀, CNC), NS: Cumberland Co., Malagash Blue Sea Beach Day Park , 45°48'17"N, 63°18'15"W, 4.viii.2013, O. Lonsdale (1♂, CNC), Kouchibouguac N.P., 2.vii.1977, J.R. Vockeroth (1♂, CNC), ON: Ottawa, 45°19'1.20"N, 75°43'12"W, 90 m, 20.vi.2016, J.E. O’Hara, Malaise trap, CNC629539, CNC629543 (2♂, CNC), Ottawa, 23.vi.1964 (1♀, CNC), Essex Co., Kingsville, ex Chenopodium album , em. i.1990, 17.ix.1989, K.L.P. Heal (2♂ 1♀, CNC), SK: near Clavet, quinoa field, 6.ix.2017, CNC939976 (1♂, CNC), vii-viii.2017, CNC939980, CNC939982-939984 (1♂ 3♀, CNC), near Colonsay, quinoa field, 5.vii.2017, NIS 2017-298, CNC939974, CNC939975 (2?, CNC) . USA. MD: Montgomery Co., Colesville , 26.vi.1977, Malaise trap, W.W. Wirth (1♂, USNM), 30.vi.1977 (1♂, USNM), 21.v.1977 (1♂, USNM), 14.vi.1977 (1♀, USNM), 4.vii.1976 (1♀, USNM), 18.ix.1977 (1♂ 1♀, USNM), 4mi SW of Ashton, Malaise trap, G.F. and J.F. Hevel, 1.ix.1981 (1♂ 1♀, USNM), 6.vi.1986 (1♂, USNM), Bethseda, 10.vii.1970, G. Steyskal (1♀, USNM) .

Comments.

Amauromyza karli is here newly recorded for the United States. The large, bright yellow head, large epistoma, thick grey thoracic pruinosity and unusual phallus are diagnostic.

Figures

Figures 84 - 91. Amauromyza flavifrons (Meigen), head 84 anterior 85 lateral 86, 87 Amauromyza karli (Hendel), head 86 dorsal 87 lateral 88 Aulagromyza nitida (Malloch), male, lateral 89 Aulagromyza tridentata (Loew), male, lateral 90, 91 Calycomyza enceliae Spencer, male, on bush sunflower (R. Hemberger - California, Irvine).

Figures 425 - 430. Amauromyza karli (Hendel), male genitalia 425 hypandrium and postgonite, ventral 426 hypandrial complex, left lateral 427 phallus, ventral 428 ejaculatory apodeme 429, 430 wings 429 A. flavifrons (Meigen) 430 A. karli.