Ophiomyia ultima (Spencer) Lonsdale, 2021

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

Ophiomyia ultima (Spencer) comb. nov.

Figs 73 , 74 , 405-410

Melanagromyza ultima Spencer in Spencer and Steyskal 1986b: 247.

Description

(Figs 73 , 74 ). Wing length 2.5 mm (♂). Female unknown. Length of ultimate section of vein M4 divided by penultimate section: 0.7. Eye height divided by gena height: 5.6-5.9. Facial carina virtually absent and without medial bulb. Ocellar triangle short, reaching between ori and ors, slightly subshiny with corners matt. Fronto-orbital plate subshiny, narrow with indistinct margins expanding to encompass base of setae. Gena receding, highest near or behind middle. Clypeus relatively stout with sides parallel.

Chaetotaxy: Male vibrissal fasciculus absent. Two ori; two ors. Mid tibia without posteromedial setae.

Colouration: Body, including halter dark brown with gena slightly paler. Wing veins brown. Calypter margin and hairs dark brown.

Genitalia: (Figs 405-410 ) Surstylus fused to, and longer than epandrium, with several irregular rows of shorter, stout setae along inner surface. Single sclerite of basiphallus narrow, short, fused to dorsomedial margin, curved dextrally. Mesophallus stout, nearly as wide as distiphallus with apex narrower; attached to distiphallus within its slightly recessed base. Distiphallus cup-like, subrectangular in outline (ventral view), with inner surface minutely textured transversely medially with ventral longitudinal sclerotisations extending past apex and enclosing medial tubule; base with shallow lobate dorsolateral extensions. Blade of ejaculatory apodeme elongate oval with dark central rib and marginal striations.

Host.

Unknown.

Distribution.

Canada: ON*, QC*. USA: VA.

Type material.

Holotype: USA. VA: Giles Co., Stony Cross, 2000', 26.v.1962, J.R. Vockeroth (1♂, CNC).

Additional material examined.

Canada. ON: Wellington Co., Smith Property Trail nr. Arkell , 43°33'N, 80°11'W, 23.vi.2015, O. Lonsdale, CNC441149 (1♂, CNC), QC: Mt Rigaud, 45°27'54"N, 74°19'24"W, 8.vi.2018, B.J. Sinclair, CNC1706881 (1♂, CNC) .

Comments.

Like other Ophiomyia , this species has a truncated clypeus, a very sparsely setose eye, and no posteromedial tibial setae, and unlike Melanagromyza , the basiphallus is asymmetrical and the ventrolateral tubules of the distiphallus are absent, although the base of the distiphallus is swollen on either side of the mesophallus to form superficially similar lobes. The surstylus and the shape and arrangement of the basiphallus, mesophallus and distiphallus are distinctive. This species is newly recorded for Canada.

Figures

Figures 69 - 77. Ophiomyia simplex (Loew), head 69 anterior 70 lateral 71, 72 Ophiomyia abutilivora Spencer, head 71 anterior 72 lateral 73, 74 Ophiomyia ultima (Spencer), head 73 anterior 74 lateral 75 - 77 Ophiomyia coniceps (Malloch), head 75 anterior 76 lateral 77 ventral.

Figures 405 - 410. Ophiomyia ultima (Spencer), male holotype genitalia 405 ejaculatory apodeme 406 phallus, ventral 407 - 410 O. ultima, Ontario non-type male 407 external genitalia, ventral 408 external genitalia, left lateral 409 phallus, ventral 410 phallus, left lateral.