Empidideicus pentagonius, Yao, Gang & Chen, Gao, 2019

Yao, Gang & Chen, Gao, 2019, First record of the genus Empidideicus Becker, 1907 (Diptera, Mythicomyiidae) in China and the Oriental Region, with description of a new species, ZooKeys 846, pp. 65-73 : 67-69

Empidideicus pentagonius sp. n. Figures 5, 6-9, 10-11

Diagnosis.

Head with ocellar tubercle yellowish, frons and face yellowish with a cup-shaped brown area between frons and face; thorax with two yellowish subtriangular marks anterolaterally, with a subtrapezoidal yellowish brown area posteriorly; katepisternum with upper 1/3 yellow; aedeagal apodeme base semicirclular, with acute tip in dorsal view, aedeagal apodeme arched in lateral view; epiphallus pentagonal, with narrow tip in dorsal view.

Description.

Male. Body length 0.8-1.4 mm, wing length 1.1-1.4 mm.

Head black and yellowish, eyes red, bare; ocellar tubercle black, ocelli yellowish; eyes dichoptic, 2 × width of ocellar tubercle, frons and face bare, yellowish, except a cup-shaped brown area between frons and face; occiput black. Antenna (Fig. 11) yellowish brown, scape semicircular nearly twice wider than long; pedicel trapezoidal, slight wider than long; first flagellomere ovoid, nearly 1.7 × longer than wide; second flagellomere about 1/3 length of first flagellomere, cylindrical, about 3 × longer than wide, with minute apical style. Antennal ratio: 1:2:8. Proboscis brown except base with a yellowish quadrilateral area laterally, nearly 2 × length of head.

Thorax (Fig. 10) black and yellowish, mesonotum mostly black except edge yellowish, postpronotal lobe yellowish, anterior with two yellowish subtriangular marks laterally, and a subtrapezoidal yellowish brown area posteriorly, mesonotum with three brown prealar bristles, anepisternum and anepimeron mostly yellow except edge of front and bottom black, katepisternum mostly black except upper 1/3 yellow.

Scutellum yellowish brown. Legs yellow except femora and tarsi brown. Legs with short brown hairs; tibiae with short black hairs and bristles, tarsi with short black hairs.

Wing (Fig. 9) hyaline, except veins brown. Wing length 2.3 × width, wing with veins R1, R4+5, M1, M2, M1+2, CuA and Cup present, Sc incomplete; Costa, Sc, R4+5 and CuA2 strongly sclerotized, vein M1, M2, M1+2 and CuA1 less sclerotized; vein R1 ending nearly in middle of costa, R4+5 slightly curved anteriorly, M1 and M2 form an acute angle, crossvein r-m at bottom of cell dm. Wing with tiny hairs at margin. Halteres yellowish, except edge of tip brown.

Abdomen with all tergites dark brown, except posterior margin with narrow pale brown band, and with yellow posterolaterally. Sternites yellowish mostly, except yellowish brown centrally, and pale laterally.

Male genitalia brown and black (Figs 6-8). Epandrium brown except edge black, nearly as long as wide, cercus well exposed, narrow and long, tip acutely in ventral view; gonocoxa L-shaped, nearly 2 × longer than wide, with acute tip, gonostylus triangular with acute tip in lateral view; aedeagal apodeme base semicircle, extremely long, and narrowly apically, with acute tip in dorsal view, aedeagal apodeme arch in lateral view; epiphallus pentagonal, with narrow tip in dorsal view, epiphallus tip sickle-shaped in laterally view.

Female. Body length 1.2-1.7 mm, wing length 1-1.2 mm. Female genitalia (Figs 12, 13) furca subtriangular, 1.7 higher than wide, with concavity at middle of bottom; spermathecal bulb subglobular when viewed on edge, nearly rectangular in lateral view, invaginated apically, subquadrate in form, slightly wider than deep in lateral view.

Type material.

Holotype male, CHINA: Yunnan Deqin Benzilan (28°21'18.91"N, 99°12'52.20"E), 08-18. XI. 2017, Yan Qin; Paratype female, CHINA: Yunnan Deqin Benzilan (28°21'18.91"N, 99°12'52.20"E), 08-18. XI. 2017, Yan Qin; 29 males 12 females, CHINA: Yunnan Deqin Benzilan (28°21'18.91"N, 99°12'52.20"E), 08-18. XI. 2017, Yan Qin.

Distribution.

China (Yunnan).

Etymology.

The specific name refers to the epiphallus pentagonal in dorsal view.

Remarks.

The new species is similar to E. legulicoxa Gharali & Evenhuis, 2010 (Iran), but it can be separated from the latter by the following features: the frons and face are yellowish, except a cup-shaped brown area between frons and face; the katepisternum mostly black except for the upper 1/3, which is yellow; the abdomen with all tergites is dark brown, except the posterior margin, which has a pale brown narrow band, and laterally, which is yellow posteriorly. In E. legulicoxa , the frons is yellowish white, and slightly depressed medially with a large squarish brown spot medially, and the lower 3/4 of the katepisternum is yellowish white; the abdomen is predominantly yellow and with medial brown color dorsally, tergites I–III are brown with undulating posterior margins (Babak et al. 2010).