Ophiomyia virginiensis Spencer, 1986

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 virginiensis Spencer

Figs 411 , 412

Ophiomyia virginiensis Spencer in Spencer and Steyskal 1986b: 260.

Description.

Wing length 2.2 mm (♂), 2.5 mm (♀). Length of ultimate section of vein M4 divided by penultimate section: 1.0. Eye height divided by gena height: 8.2. Facial carina distinct with large medial bulb (strongly furrowed medially, shiny on dorsal 1/2), not narrowed above bulb. Eye angled diagonally. Gena strongly produced anteriorly, forming an ~ 60° angle (slightly larger angle in specimens from Turkey Run). Clypeus strongly produced and narrowed anteriorly. Crossveins separated by less than length of dm-m.

Chaetotaxy: Male vibrissal fasciculus thick and upcurved, ~ 2/3 length of gena. Two ori; two ors. Mid tibia with one posteromedial seta.

Colouration: Body, including halter dark brown. Wing veins brown. Calypter margin and hairs dark brown. Abdomen with coppery/golden shine.

Genitalia: (Figs 411 , 412 ) Metepiphallus pale and narrow with one pair of ventrobasal spines. Epiphallic lobes evenly dark. Halves of basiphallus fused at base with remainder of left sclerite highly reduced and ill-defined; right sclerite narrow and elongate, exceeding base of distiphallus. Mesophallus base not exceeding that of distiphallus. Distiphallus divided into a large, rounded subtriangular basal lobe, and a slightly narrower distal section that is nearly parallel-sided and compressed dorsoventrally, with a more densely spinulose basal chamber, several sclerotised ventromedial ridges and an internal tubule. Ejaculatory apodeme large, broad, relatively evenly pigmented and without medial rib.

Host.

Unknown.

Distribution.

USA: VA.

Type material.

Holotype: USA. Virginia: Hawksbill, Shenandoah N.P., 3600-4050', 7.vi.1962, J.R. Vockeroth (1♂, CNC).

Additional material examined.

USA. VA: Fairfax Co., Turkey Run Park , nr. mouth of Turkey Run, 38°57.9'N, 7°09.4'W, Malaise trap, 23.viii-18.ix.2007, D.R. Smith (1♂ 3♀, USNM)

Comments.

Ophiomyia virginiensis can be characterised by a strongly pronounced furrow on the facial bulb, the ultimate and penultimate sections of M4 are equal in length, the basiphallus is mostly composed of a single narrow band, and the distiphallus is large with discrete sections, including a high, internally smooth subtriangular basal section.

Figures

Figures 411, 412. Ophiomyia virginiensis Spencer, holotype 411 male genitalia 412 phallus, left lateral (from Spencer and Steyskal 1986 b).