Ophiomyia cuprea, 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 cuprea sp. nov.

Figs 342-345

Description.

Wing length 2.2 mm (♂). Female unknown. Length of ultimate section of vein M4 divided by penultimate section: 0.9. Eye height divided by gena height: 9.3. Facial carina relatively long below, nearly as wide as bulb and with diverging margins above. Clypeus narrow. Gena slightly projecting, forming almost a 60° angle. Ocellar triangle subshiny around ocelli. Fronto-orbital plate thin and subshiny. Buccal cavity narrowed anteriorly with anterior margin straight. Distance between crossveins more than length of dm-m.

Chaetotaxy: Male with vibrissal fasciculus ~ 2/3 length of gena and strongly upcurved. Two ori on right side, three on left; two ors. Setae on mid tibia not visible, possibly absent. Five to six rows of acrostichal setulae.

Colouration: Body, including halter dark brown. Calypter margin and hairs brown. Abdomen with weak coppery shine. Veins light brown.

Genitalia: (Figs 342-345 ) Surstylus ~ 1/2 length of epandrium, rounded marginally and with tubercle-like setae on inner surface. Metepiphallus pale with one pair of ventromedial spines. Epiphallic lobe clear with dark sclerite. Halves of basiphallus broadly fused at base with remainder of left sclerite absent; right sclerite apically broad and truncated. Distiphallus dark and well-sclerotised with distinct basal and distal sections - basal section high, tapered to base, minutely spinulose internally and with internal dorsomedial hook; distal section shallower, with left margin receding and minutely tuberculedridged, and right 1/2 longer, internally spinulose and ill-defined apically.

Host.

Unknown.

Distribution.

USA: MD.

Etymology.

The specific epithet is derived from the Latin for coppery, referring to the colour of the abdomen, which has a weak metallic lustre.

Type material.

Holotype: USA. MD: nr. Plummers Isl., 5.v.1915, R.C. Shannon (1♂, USNM).

Comments.

The head (particularly the gena) and genitalia of Ophiomyia cuprea are similar to those of the Californian O. delecta Spencer ( Spencer and Steyskal 1986b: figs 271, 272), but O. delecta differs in having eight rows of acrostichal setulae (not five to six), a black (not coppery) abdomen and a facial bulb that is much narrower than the pedicel ( Spencer 1981). Furthermore, based on Spencer’s illustration, the distiphallus of that species is more broadly rounded basally and atrophied apically. Spencer (1981) also describes the similar O. definita Spencer (later provided the new name O. subdefinita Spencer; Spencer and Steyskal 1986b: figs 268, 269) in his Californian revision, but the fasciculus is straight (not curved), the abdomen is also black and the distiphallus is much paler; the number of rows of acrostichal setulae are not mentioned, but it is indicated that there are also eight.

Figures

Figures 342 - 345. Ophiomyia cuprea Lonsdale, sp. nov., male genitalia 342 external genitalia, ventral 343 hypandrium, ventral 344 hypandrial complex, left lateral 345 phallus and proepiphallus, ventral.