Anthomyza gracilis, Fallen, 1823

Roháćek, Jindřich & Barber, Kevin N., 2016, Nearctic Anthomyzidae: a monograph of Anthomyza and allied genera (Diptera), Acta Entomologica Musei Nationalis Pragae (suppl.) 56, pp. 1-412 : 314-315

publication ID	https://doi.org/ 10.5281/zenodo.4272829
publication LSID	urn:lsid:zoobank.org:pub:E95E58A5-E0F1-4237-9D7C-4A81BB3120DD
DOI	https://doi.org/10.5281/zenodo.4339676
persistent identifier	https://treatment.plazi.org/id/03FB87A9-FEDA-FEBB-FF6E-6866FBA4FDF7
treatment provided by	Felipe
scientific name	Anthomyza gracilis
status

Treatment

Key to identincation of the Nearctic species of the Anthomyza gracilis View in CoL group

1 Head in pronle slightly higher than long; eye broad, little narrowed posterodorsally ( Fig. 518 View Figs 518–523 ); orbit dark from vertex beyond posterior ors, usually to about midway between posterior and middle ors ( Fig. 519 View Figs 518–523 ); in lateral view, narrow area above postgena anteriorly greyish but abruptly becoming shiny brown to black on occiput ( Fig. 518 View Figs 518–523 ); caudal process of male with ventral appendage more elongate ( Fig. 532 View Figs 527–535 ) and thin in lateral pronle ( Fig 530 View Figs 527–535 ) and lacking anteroventral angularity; aedeagal part of folding apparatus with strong spines ventrally ( Figs 528, 534 View Figs 527–535 ); female T7+S7 with ventral anteromedial area triangular and distinctly domed (medially convex), ventral desclerotized area small and without sclerotized posteromedial appendage ( Figs 536, 538 View Figs 536–543 ). ........................................................................................... A. furvifrons sp. nov.

– Head in pronle more depressed, longer than high; eye elongate, narrowed posterodorsally ( Figs 520, 522 View Figs 518–523 ); orbit dark only from vertex to posterior ors and abruptly yellow in front of it ( Figs 521, 523 View Figs 518–523 ); in lateral view, area above postgena somewhat broader and generally continuously greyish from margin of eye onto occiput ( Figs 520, 522 View Figs 518–523 ); caudal process of transandrium with ventral appendage less elongate ( Figs 555 View Figs 551–559 , 584 View Figs 580–588 ) and thicker in lateral pronle ( Figs 553 View Figs 551–559 , 582 View Figs 580–588 ) and anteroventrally more or less angular; aedeagal part of folding apparatus without strong spines ventrally ( Figs 556, 558 View Figs 551–559 , 585, 587 View Figs 580–588 ); female T7+S7 with ventral anteromedial area shorter and longitudinally grooved ( Fig. 565 View Figs 560–565 , arrow) often producing a chordate posterior margin, ventral desclerotized area large and posteromedial appendage behind it well sclerotized ( Figs 564–566, 568, 570 View Figs 560–565 View Figs 566–573 , 589, 591 View Figs 589–596 ). .................................................................................... 2

2(1) Thorax brownish grey to dark bronze microtomentose; midline sternal setae predominantly black. f 1 usually with at least some grey to brown darkening on posterior surface ( Fig. 522 View Figs 518–523 ), at least basal corner of cx 1 always dull grey- to brown-darkened, sometimes also other femora and tibiae partly darkened ( Fig. 574 View Figs 574–579 ) especially t 1 opposite the ctenidial spine; frons with medial darkening extending anteriorly to at least middle ors ( Fig. 523 View Figs 518–523 ) and as far as anterior margin; male preabdominal sterna dark, ochreous brown; caudal process of transandrium with ventral appendage widely naring ventrally ( Fig. 582 View Figs 580–588 ) and posteriorly ( Figs 583, 584 View Figs 580–588 ); female T7+S7 with pale-pigmented anteroventral strip broadly extended dorsolaterally ( Fig. 591 View Figs 589–596 ), reaching above 7th spiracle ( Fig. 589 View Figs 589–596 ), and shiny secondary posterolateral sclerotization prominent ( Fig. 589 View Figs 589–596 , arrow); associated with horsetails ( Equisetum spp.). ................................. A. equiseti View in CoL sp. nov.

– Thorax usually pale grey microtomentose; midline sternal setae predominantly pale (very rarely all black). All femora and tibiae entirely yellow ( Figs 520 View Figs 518–523 , 545 View Figs 544–546 ), cx 1 sometimes with a shiny brown darkening basally; frons with anterior margin usually broadly yellow ( Fig. 521 View Figs 518–523 ), rarely with medial darkening extending beyond middle ors; male preabdominal sterna pale, dirty yellowish; caudal process of transandrium with ventral appendage moderately naring ventrally ( Figs 553 View Figs 551–559 , 561 View Figs 560–565 ) and posteriorly ( Figs 554, 555 View Figs 551–559 ); female T7+S7 with pale-pigmented anteroventral strip not extended dorsolaterally ( Figs 564, 565 View Figs 560–565 , 568 View Figs 566–573 ), and shiny posterolateral sclerotization absent ( Figs 564 View Figs 560–565 , 566 View Figs 566–573 ); associated with grasses or sedges. ....................................... A. vulgaris View in CoL sp. nov.