Phytomyza aesculi 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

Phytomyza aesculi Eiseman & Lonsdale

Figs 727-731

Phytomyza aesculi Eiseman & Lonsdale, 2018: 66. Eiseman et al. 2021: 32 (females tentatively identified).

Description

(from Eiseman and Lonsdale 2018 and Eiseman et al. 2021). Wing length 1.9 mm (♂), 2.3-2.5 mm (♀). Vein dm-m absent. Eye height divided by gena height: 2.3-3.1. First flagellomere small, rounded. Arista pubescent. Cheek present, ~ 2/5 height of gena. Posterior ocelli slightly displaced. Vein dm-cu absent. Body pruinose.

Chaetotaxy: Two ori (anterior ori thin, setula-like to 2/5 length posterior ori, sometimes absent on one side); one ors. Ocellar and postvertical setae subequal to anterior ors. Four dorsocentral setae decreasing in length anteriorly with anterior two much shorter. Acrostichal setulae in three or four irregular to scattered rows that are clearly separated from dorsocentral rows.

Colouration: Setae dark brown. Head mostly light yellow; very narrow brown margin around eye that is thickest ventromedially; antenna, back of head, clypeus, palpus and ventral line on gena dark brown; ocellar spot slightly larger than tubercle, dark brown to black, ovate, wider than long; posterolateral corner of frons dark brown to base of outer vertical seta, brown to light brown to base of inner vertical, sometimes with narrow dark line between base of setae; face with irregular brown colour with yellowish patches. Notum with light brown pruinosity that is denser and greyer on notum. Thorax dark brown with white lateral stripe narrowing posteriorly from postpronotum to supra-alar region (except for large dark spot on postpronotum), scutum with small whitish spot anterolateral to corner of scutellum, posterodorsal region of anatergite whitish, katatergite white with posteroventral region dark brown, meron dorsally white and anepimeron white with anterior 1/2 mostly brown. Wing veins whitish, paler to base. Calypter white. Haltere white. Legs dark brown with light yellow spot on femora apices as long as wide, base and apex of tibiae light yellow, and tarsi light yellow with brown tint and with apical tarsomere light brown; male and one female with mid tibia yellower and fore tibia mostly yellow. Abdomen dark brown.

Genitalia: (Figs 727 - 7 31) Surstylus fused to epandrium, small, internally setose. Epandrium with narrow flat plate along posterior margin. Hypandrium well-developed, rounded. Postgonite stout, strongly curved medially, with one medial seta. Phallophorus well-developed. Basiphallus composed of two narrow plates; right plate extending onto dorsum basally; left plate shorter with basal arm wrapping around shaft. Hypophallus divided into two narrow lateral sclerotised bars with lobate extension on anterior margin near base. Paraphallus dark but strongly reduced to one pair of small pointed anteroventral extensions arising from mesophallus. Mesophallus small, cylindrical, laterally bulging distally and tapered basally where it is as wide as duct, fused to distiphallus. Distiphallus divided into one pair of long, narrow tubules, as long as remainder of phallus combined, that are strongly divergent at base (initially perpendicular to long axis of phallus), and converging and slightly curved along most of length. Ejaculatory apodeme well-developed with especially broad blade and base; sperm pump with transverse sclerotised bar that is broadly thickened at lateral margins.

Variation: Virginia females differ as follows: face darker, venter of lunule and region around antennal bases blackish, and apices of mid and hind femora dark.

Host.

Sapindaceae - Aesculus glabra ; VA females from A. flava , and leaf mines seen on A. pavia and A. sylvatica .

Distribution.

USA: OH, VA[tentatively identified female]. Leaf mines from Canada (ON) and AL, AR, GA, IA, KS, MN, MO, NC, PA, SC, VA.

Type material.

Holotype: USA. OH: Delaware Co., Sunbury, Monkey Hollow Rd., 6-11.v.2015, em. 9-12.iii.2016, J. A. Blyth, ex Aesculus glabra , #CSE2239, CNC654467 (1♂, CNC).

Paratypes: USA. OH: same collection as holotype, CNC654468-654469 (2♀, CNC).

Additional material examined.

USA. VA: Radford , Wildwood Park, 3.v.2017, em. 8-11.iv.2018, N.V. Kent, ex Aesculus flava , #CSE4400, CNC1135662-1135664 (3♀, CNC) .

Figures

Figures 727 - 731. Phytomyza aesculi Eiseman and Lonsdale, male genitalia 727 external components, posterior 728 postgonite, left lateral 729 hypandrium, ventral 730 phallus, ventral 731 phallus, left lateral, and ejaculatory apodeme. Originally published in Eiseman and Lonsdale (2018).

Figures 7 - 11. Agromyza canadensis Malloch, female 7 lateral 8 detail of thorax, lateral 9 dorsal 10 detail of thorax, dorsal 11 Agromyza pseudoreptans Nowakowski, extended female postabdomen, lateral (fig. 20 from Spencer 1987). Abbreviations: 1, fore; 2, mid; 3, hind; anatg, anatergite; anepm, anepimeron; anepst, anepisternum; ap sctl s, apical scutellar seta; cx, coxa; dc s, dorsocentral seta (numbered from back); f, femur; kepst, katepisternum; ktg, katatergite; lat sctl s, lateral scutellar seta; mr, meron; mtg, mediotergite; npl, notopleuron; npl s, notopleural seta; ovsc, oviscape (fused tergite and sternite 7); pre spal s, presutural supra-alar seta; post ial s, postsutural intra-alar seta; post spal s, postsutural supra-alar seta; pprn, postpronotum; pprn s, postpronotal seta; proepst, proepisternum; sctl, scutellum; t, tibia; T, tergite; tar, tarsus; trch, trochanter.