Agromyza fission Eiseman & Lonsdale, 2018

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

Agromyza fission Eiseman & Lonsdale

Figs 183-187

Agromyza fission Eiseman & Lonsdale, 2018: 9.

Description

(from Eiseman and Lonsdale 2018). Wing length 2.3 mm (♂). Female unknown. Length of ultimate section of vein M4 divided by penultimate section: 1.0. Eye height divided by gena height: 3.9. First flagellomere small and rounded, without pale tuft of hairs. Fronto-orbital plate slightly projecting (more so anteriorly). Ocellar triangle small and rounded. Thorax with light pruinosity.

Chaetotaxy: Two ori; two ors. Three strong dorsocentrals, anterior seta 2/3 length of second. Mid tibia without posteromedial setae.

Colouration: Setae black. Body mostly dark brown. Head yellowish orange with first flagellomere infuscated on distal 2/3, back of head and occiput dark brown, frons dark brown behind level of hind fronto-orbital, face white and clypeus brown to dark brown. Calypter margin and hairs brown. Halter white. Tarsi, base of fore tibia and apex of fore femur yellow.

Genitalia: (Figs 183-187 ) Surstylus small, lobate, setulose, and slightly angled anteriorly; fused to anteroventral margin of epandrium with suture partially evident. Cercus broad and emarginate apically; inner surface covered with numerous small tubercle-like setae. Postgonite small and rounded with shallow inner lobe. Single sclerite of basiphallus fused to phallophorus on left side, twisted dextrally; distal margin forming small transverse sclerite. Mesophallus small and flat. Distiphallus composed of a single dark, flat, curved sclerite (shortest dorsally) nearly forming a complete tube; lateral margins fringed and not meeting ventrally.

Host.

Cannabaceae - Celtis occidentalis ( Eiseman and Lonsdale 2018).

Distribution.

USA: IA, MD, OK, WI.

Type material.

Holotype. IA: Allamakee Co., Red Oak Prairie (43°14'13.43"N, 91°7'8.58"W), 16.vii.2015, em. 2.viii.2015, C.S. Eiseman, ex Celtis occidentalis , #CSE1925, CNC564711 (1♂, CNC).

Paratypes. IA: same collection as holotype, CNC564712 (1♂, CNC), MD: Plummers Isl., 23.v.1914, R.C. Shannon (1♂, USNM), OK: Payne Co., Mehan, 36.014339°N, 96.996744°W, 5.iv.2016, em. 20- 22.iv.2017, M.W. Palmer, ex Celtis occidentalis , #CSE3529, CNC939918, CNC939919 (1♂ 1♀, CNC); WI: Buffalo Co., Alma, S1287 State Road 88, 17.vii.2015, em. 3.iv.2016, C.S. Eiseman, ex Celtis occidentalis , #CSE2311, CNC634841 (1♂, CNC).

Comments.

Although largely similar to Agromyza varifrons , the male cerci are highly derived and diagnostic: they are strongly widened apically and deeply cleft, with small, tubercle-like setae covering the inner surface.

Figures

Figures 183 - 187. Agromyza fission Eiseman & Lonsdale, male genitalia 183 phallus, ventral 184 hypandrial complex, left lateral 185 hypandrium and postgonite, ventral 186 external genitalia, left lateral 187 external genitalia, ventral. Originally published in Eiseman and Lonsdale (2018).