Revision of the Nearctic species of Gimnomera Rondani (Diptera: Scathophagidae) with morphological phylogeny and DNA barcodes Author Chagnon, Marie-Eve 0000-0001-7843-1060 Department of Natural Resource Sciences, McGill University, Macdonald Campus, Ste-Anne-de-Bellevue, QC, H 9 X 3 V 9, Canada & meh. chagnon @ gmail. com; https: // orcid. org / 0000 - 0001 - 7843 - 1060 meh.chagnon@gmail.com Author Sinclair, Bradley J. 0000-0001-6413-1606 Canadian National Collection of Insects & Canadian Food Inspection Agency, OPL-Entomology, K. W. Neatby Bldg., C. E. F., 960 Carling Ave., Ottawa, ON, K 1 A 0 C 6, Canada & bradley. sinclair @ canada. ca; https: // orcid. org / 0000 - 0001 - 6413 - 1606 bradley.sinclair@canada.ca text Zootaxa 2020 2020-09-23 4853 3 369 403 journal article 8412 10.11646/zootaxa.4853.3.3 e1297bcb-24e9-4306-8210-068cc6f5f482 1175-5326 4410845 5542FC21-6790-4F20-BDCC-393899A5D89E Gimnomera incisurata Malloch ( Figs 7, 8 , 34 ) Gimnomera incisurata Malloch, 1920: 37 . Type locality: Dubois , Illinois , USA . Diagnosis. This Nearctic species is characterized by the male terminalia with triangular-shaped cercus, troughshaped surstylus and branched pregonite. Yellow coloured G. incisurata are similar in appearance to the Nearctic species G. cerea , G. terrywheeleri and G. vockerothi , but G. vockerothi has a single postpronotal seta and G. terrywheeleri has a dark-coloured pedicel. In G. cerea , the setae on the anterior margin of the scutum and postpronotum are dark and the surstylus is ear-shaped. Dark coloured G. incisurata are similar to the Nearctic species G. aquilonia , G. cuneiventris , G. tibialis and G. subvittata , but are distinguishable by the male cercus: cup-shaped in G. aquilonia ; triangular with protrusions in G. subvittata , and by the surstylus: hatchet-shaped in G. cuneiventris , and lastly by the pregonite: unbranched in G. aquilonia , G. cuneiventris and G. tibialis . Redescription. Male. Body: Primarily yellow; pleura yellow; scutum yellow; entire body shiny (high altitude Western specimens with primary colour brown/black; pleura brown/black; scutum brown/black; entire body pruinose). Head with face yellow; gena yellow; genal width 1⁄3 eye height; postgena yellow. Frontal vitta yellow; fronto-orbital plate yellow; parafacial yellow (high altitude Western specimens with face and gena black or yellow postgena brown/black. Fronto-orbital plate and parafacial black or yellow; setae on head yellow). Fronto-orbital plate with 2 inclinate frontal setae, 1 proclinate and 2 lateroclinate orbital setae, 1 pair of lateroclinate ocellar setae, 1 pair of divergent postocellar setae, 1 long inclinate inner vertical seta, 1 long lateroclinate outer vertical seta. Gena with no supravibrissal setae; 1 strong vibrissa; 4–7 variably lengthened subvibrissal setae, 1 subequal to vibrissa. Antenna with postpedicel black, about twice as long as pedicel; scape and pedicel yellow, pedicel with 1 long black setula along ptilinal fissure; arista black and pubescent. Palpus yellow with black setae apically. Thorax with scutal setae black (high altitude Western specimens with scutal setae yellow); acrostichal setae biserial, finer and paler than dorsocentrals; 2 presutural and 3 postsutural dorsocentral setae; 2 posterior postpronotal setae and two rows of 1–9 (less than 10) short, erect postpronotal setae on anterior margin of postpronotal lobe and scutum; anterior setae variable in thickness; 1 presutural intra-alar seta, 2 notopleural setae, 2 postsutural supra-alar setae, 2 postalar seta. Pleura with 1 yellow or black proepisternal seta and 1 yellow or black proepimeral seta; 2 black posterior anepisternal setae and 2–3 pale anepisternal setulae; 1 posterodorsal katepisternal setae; anterior half of anepisternum and anepimeron bare, katepisternal with setulae dorsally. Wing (length 2.6–3.9 mm ) clear, lightly infuscate; R 1 with singular row of 15–17 setulae on apical 1⁄4 above; CuA+CuP ends just before wing margin. Halter yellow/white. Legs entirely yellow. Fore coxa with long, white dorsal pile. Fore femur with long, white ventral pile; 2 posterodorsal setae on apical 1⁄4. Fore tibia with 1 preapical posterodorsal seta, 1 preapical anterodorsal seta, 1 preapical dorsal seta, 2 mid posterodorsal setae and 2 mid anterodorsal setae. Mid femur with 2 posterodorsal setae on apical 1⁄4. Mid tibia with 1 preapical posterodorsal seta, 1 preapical anterodorsal seta, 1 preapical dorsal seta, 1 mid posterodorsal seta and 1 mid anterodorsal seta. Hind femur with 1 preapical anterior seta and 1 mid anterodorsal seta. Hind tibia with 1 preapical anterodorsal seta, 2 preapical dorsal setae, 2 anterodorsal setae and 2 dorsal setae at mid-length of tibia. Tarsi with short, white ventral pile. Abdominal tergites yellow, with pale setulae over surface.Abdominal sternites also yellow (high altitude Western specimens with abdominal tergites brown/black and sternites brown/black). Sternite 5 similar to G. subvittata . Terminalia ( Figs 7, 8 ) with epandrium yellow; surstylus yellow; cercus yellow; hypandrium yellow. Surstylus approximately as long as cercus; in shape of shallow trough with indent facing cercus. Cercus triangular, fused apically; sides smooth with no protrusions. Pregonite split into 2 branches, both branches subequal in length; dorsal branch with 4 long thick setae; ventral branch with 2 long thick setae. Postgonite positioned dorsally to pregonite, apical end curved ventrally. Female. Similar to male, differ only in abdominal tergites with black stripe posteriorly; intersegmental membrane between 7 and 8 clothed with short pale spines; tergite and sternite 8 weakly fused, both prolonged posteriorly and closely approximated. Type material examined. HOLOTYPE ♂ , labelled: “ INHS / Insect Collection/ 238,604 [white label]”; “Dubois, Ill/ May 10, [19]18”; “ Gimnomera / incisurata/ Male type”; “ TYPE / Gimnomera / incisurata/ ♂ Malloch [red label]” ( INHS ). ALLOTYPE : same data as holotype, except, INHS Insect Collection 238,603 ( 1♀ , INHS ). PARATYPES : same data as holotype ( 1♂ , CNC ; 1♂ , INHS ); same data except, 25.v.1917 ( 1♀ , INHS ). Additional material examined. CANADA . Alberta : Banff NP [ 51°29′39.8′′N 115°56′00.8′′W ], 10.vi.1955 , G.E. Shewell ( 1♀ , CNC ) ; Elkwater [ 49°39′43.5′′N 110°16′50.8′′W ], 8.vi.1952 , A. R . Brooks ( 1♂ , CNC ) ; same data except, 24.v.1952 ( 1♀ , CNC ) ; Mountain View [ 49°07′58.5′′N 113°35′56.7′′W ], 9.vi.1962 , W. R . M. Mason ( 1♂ , CNC ) . British Columbia : Crowsnest [ 49°37′58.5′′N 114°41′18.0′′W ], 17.vi.1962 , W. R . M. Mason ( 1♀ , CNC ) . Ontario : Cambridge [ 43°21′42.6′′N 80°18′51.4′′W ], 6.vi.1996 , E.A. Lippert ( 1♀ , DEBU ) ; Hamilton [ 43°15′19.1′′N 79°52′16.3′′W ], 15–20.vi.1980 , M. Sanborne ( 1♀ , DEBU ) ; Kent Co. , Rondeau PPk, Spicebush Trail , 42°18′9″N 81°51′6″W , 16–17.vi.2003 , Buck & Carscadden ( 1♀ , DEBU ) ; Osgoode [ 45°09′44.5′′N 75°36′05.6′′W ], 16.v.1951 , J.F. McAlpine ( 1♂ , CNC ) ; Osgoode [ 45°09′44.5′′N 75°36′05.6′′W ], 15.v.1964 , J. R . Vockeroth ( 1♂ , CNC ) ; same data except, 22.v.1964 ( 2♂ , CNC ) ; same data except, 18.vi.1964 ( 1♀ , CNC ) ; same data except, 28.v.1965 ( 1♂ , CNC ) ; Osgoode [ 45°09′44.5′′N 75°36′05.6′′W ], 5.vi.1964 , S.E. Neff ( 2♀ , CNC ) . USA . Colorado : Boulder [ 40°00′54.3′′N 105°15′56.6′′W ], 9.vi.1961 , W. R . M. Mason ( 1♂ , CNC ) ; Boulder [ 40°00′54.3′′N 105°15′56.6′′W ], 16.vi.1961 , C.H. Mann ( 1♀ , CNC ) ; Clear Creek Co. , 39°40′36′′N 105°48′22′′W , 13–22.vi.2017 , Malaise trap , J.M. Cumming & S.E. Brooks ( 2♂ , CNC ) ; Corona Pass , Boulder Co. [ 40°03′36.6′′N 105°21′15.5′′W ], 6.vii.1961 , J.G. Chillcott ( 1♀ , CNC ) ; Doolittle Ranch , Mt. Evens [ 39°35′19.6′′N 105°38′37.8′′W ], 27.vii.1961 , W. R . M. Mason ( 1♀ , CNC ) ; Echo Lake , Mt. Evans [ 39°39′36.3′′N 105°35′52.5′′W ], 26.vi.1961 , B.H. Poole ( 1♀ , CNC ) ; Hinsdale Co. , 38°10′56′′N 107°18′19′′W , 15.vi.2017 , J.M. Cumming ( 1♂ , CNC ) ; San Juan Co. , 37°38′48′′N 107°50′55′′W , 18.vi.2017 , J.M. Cumming ( 1♀ , 1♂ , CNC ) ; San Juan Co. , 37°39′10′′N 107°51′57′′W , 18.vi.2017 , S.H. Cumming ( 3♂ , CNC ) ; San Juan Co. , Pasture Ck , 37°38′48′′N 107°50′55′′W , 18.vi.2017 , S.E. Brooks ( 1♂ , CNC ) . North Carolina : Linville Caverns , 35°55′7.94′′N 81°56′18.35′′W 26.v.1999 , J. R . Vockeroth ( 1♂ , CNC ) . Distribution. The western populations of this species are found along the Rocky Mts from Alberta to Colorado . The eastern populations are known from Illinois , Ontario and North Carolina ( Fig. 34 ). Remarks. Colour morphs are present in this species. The colour differences appear dependent on the collection locality of the specimen. Dark coloured specimens occur in higher altitudes and latitudes.