Dichopygina perfecta

• Main Authors: Leng, Ruixin, Heller, Kai, Huang, Junhao, Ye, Lan, Wu, Hong
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Diptera; Sciaridae; Dichopygina; Dichopygina perfecta; Rovaniemi; Lapland
• Online Access: https://doi.org/10.5281/zenodo.5458733; http://treatment.plazi.org/id/03F687A9FFE9FFB0FF7868D26B4712DD

Dichopygina perfecta (Pettey, 1918) (Figs 2–6) Neosciara perfecta Pettey, 1918: 325, 341, figs 30, 61. Type locality: USA, Maryland, Montgomery Co., Plummers Island. Bradysia perfecta (Pettey, 1918): Stone & Laffoon, 1965: 234. Corynoptera perfecta (Pettey, 1918): Steffan, 1966: 49, 54. Dichopygina perfecta (Pettey, 1918): Mohrig et al. , 2013: 200–201, fig. 28. Material examined. Canada. 1♂, New Brunswick, Fundy National Park, Devil`s Halfacre Road (45°35'22″N, 64°57' 20″W; elev. 61 m), 21 May 2013, leg. Shirley Butland (CNFDK107-14) (BIOG); 1♂, New Brunswick, Kouchibouguac National Park, Near Park Compound, behind Research House (46°46'15″N, 65°00'23″W; elev. 61m), malaise trap, 26 August 2013, leg. Bernard Martin (CNKOS809-14) (BIOG). Finland. 2♂, Lapland, Rovaniemi, Sorvanulkki, herb-rich, old-growth boreal forest, malaise trap, 28 July 2014, leg. Jukka Salmela (SCILA010-16, SCILA009-16) (BIOG). Diagnosis. The morphological differences between D. perfecta and D. bernhardi are hereby confirmed. The gonostylus of D. perfecta has almost equal 7–9 thin and straight subapical megasetae in one group, whereas D. bernhardi has 10–13 megasetae at the apical half of the gonostylus and the basalmost megasetae longer than others. In addition, the tegmen of D. perfecta is equally rounded, while it is flatter in D. bernhardi . Redescription. Colour. Thorax bright brown; abdomen, hypopygium brown; legs yellow; wing hyaline or slightly darkened. Antenna unicolour and yellowish brown. Head. Eye bridge 2–3 facets wide. Antennal setae fine, dense, shorter than segment width. Length/width of flagellomere 4 of antenna 1.40–1.80; transition of basal part to neck pronounced (Fig. 3). Neck length/segment width 0.30–0.40. Maxillary palpus bright and 3-segmented; basal segment with 1 bristles; 2nd segment short, oval; 3rd segment as long as basal segment; sensillae present. Thorax. Notum brown. Thoracic setae weak, white. Posterior pronotum bare. Mesothoracic sclerites bare. Wings (Fig. 4). Length 1.6–1.9 mm. bM, r-m bare; R 1/ R ...