Mydaea apicinigra Wang, Li & Yang, 2023

Wang, Yameng, Li, Wenliang, Li, Xin & Yang, Ding, 2023, Two new species of the subfamily Mydaeinae (Diptera: Muscidae) from China, Zootaxa 5318 (4), pp. 543-554 : 550-553

Mydaea apicinigra Wang, Li & Yang , sp. nov.

Figs. 13–24

Diagnosis. Eyes with distinct but very short pile as long as distance between hairs. Frontal vitta linear; fronto-orbital plate touching each other at narrowest point of frons, as wide as anterior ocelli at narrowest point of frons. Scape and pedicel yellowish-brown, postpedicel black. Palpus yellow, but black at distal 1/4. acr 0+1; dc 2+4; kepst 1+2; pra slightly longer than npl. notopleuron with hairs. Legs yellow except tarsi black brown.

Description. Male. Body length 6.1mm, wing length 5.8mm.

Head ( Fig. 16 ). Eyes with distinct but very short pile as long as distance between hairs. Frontal vitta linear; fronto-orbital plate touching each other, as wide as anterior ocelli at narrowest point of frons. Fronto-orbital plate and parafacials grey white pruinose in anterodorsal view. Parafacials 1/3 as wide as postpedicel. Scape and pedicel yellowish-brown, postpedicel black. Arista short plumose, the longest hair 1/4 as long as width of postpedicel. Frontal setae with 7 pairs, gradually weakened, on lower half of frons. Palpus yellow, but black at distal 1/4. Prementum 2/3 as long as palpus.

Thorax ( Fig. 13 ). Ground colour black, but postalar callus indistinctly dark brown. Scutellum yellow except dorsal surface basal black. Scutum with 4 vittae in postdorsal view, inner two reaching scutoscutellar suture. h 2; ph 1; pres 1; npl 2; sa 2; ial 0+2; pal 2; acr 0+1; dc 2+4; kepst 1+2; pra slightly longer than posterior npl. Notopleuron and katepisternum with hairs. Propleura, basisternum of prosternum, anepimeron, meron and metapleuron katepimeron bare. Lateral surface of scutellum with hairs, but ventral surface bare. sctl 4 pairs, basal and apical sctl strong; prebasal and subapical sctl weaker.

Wings ( Fig. 17 ). Yellowish to light brown. Tegula blackish brown, basicosta pale yellow. Costal spine small, 1/3 as long as r-m. Sc bow-shaped; m-m straight; M 1 straight, divergent with R 4+5 at apical part. Dorsal and ventral surfaces of radial node with setae. Calypters yellow transparent. Lower calypter tongue-shaped; halter knob yellowish white.

Legs ( Fig. 15 ). Yellow except tarsi black brown. Fore femur with complete rows of d, pd and pv; fore tibia with 1 median p. Mid femur with pv row, setae on basal half twice as long as on distal half; mid tibia with 2 p. Hind femur with a distinct row of av and ad; hind tibia 3 av and 1 ad.

Abdomen ( Fig. 14 ). Oviform. Black in ground color, without color shifting patch, with a very narrow median dark stripe. Sternite I bare. Sternite V as in figs. 18, 22.

Terminalia ( Figs. 19–24 ). Ground color deep yellow. Ejaculatory apodeme developed, clearly visible. Hypandrium spoon-like, not tubular. Phallapodeme strongly sclerotized, long and rod-like and slightly curved downwards. Pregonite with a protruding cusp. Upper part of aedeagus inflated; lower part of aedeagus sharp. Angle between phallapodeme and epiphallus about 180 degree. Postgonite and epiphallus almost the same length, weakly sclerotized on apical part. Postgonite curved downwards on apical part.

Female. Body length 7.2mm, wing length 7.0mm. The other characteristics are the same as the male except for the following: eye with sparser hairs than in male; frons 5 times as wide as distance between outer margins of posterior ocellus. Ocellar triangle almost reaching anterior margin of frons, as wide as outer margins of posterior ocellus; frons distinct with 5 pairs of fr and 2 pair of orb, accompanied by some setulae; scutellum entire yellow; sctl 4 pairs all strong; abdomen without median dark stripe or patch.

Type material. Holotype male ( HAUST), CHINA: Qinghai, Haibei Tibetan Autonomous Prefecture , menyuan county, xianmi village, 37°11′45″N, 102°11′7″E, 25. VII. 2022, 2665 m, leg. Chaoyang Kong. Paratypes, 1 female ( HAUST), same data as holotype .

Distribution. China (Qinghai).

Remarks. This new species is similar to M. quinquiseta Xue, 2019 , but different from the latter in the following points: eyes with hairs; scape and pedicel yellowish-brown, postpedicel black; palpus yellow, but black at distal 1/4; legs yellow except tarsi black brown; hind femur without pv. In M. quinquiseta , the antennae, palpi and legs are black; the hind femur has pv on basal half shorter than thickness of the hind femur. This new species is also similar to M. corni (Scopoli, 1763) , but different from the latter in the following points: legs yellow except tarsi black brown; hind femur without pv. In M. corni , the legs are yellow except coxae, trochanters and tarsomeres black; and the hind femur has a complete row of pv ( Gregor et al., 2016; Du et al., 2019).

Etymology. The species name is from the Latin apici - (“apex”) and nigra (“black”), refers to the palpus yellow, but black at distal 1/4. Chinese name of the species: “ ȇḙnḁ ”.

Figures

FIGURES 13–17. Mydaea apicinigra Wang, Li & Yang, sp. nov. male. 13. head and thorax, dorsal view; 14. abdomen, dorsal view; 15. habitus, lateral view; 16. head, anterior view; 17. wing. Scale: 1mm.

FIGURES 18–21. Mydaea apicinigra Wang, Li & Yang, sp. nov. male terminalia. 18. sternite V, ventral view; 19. phallic complex, lateral view; 20. cerci and surstylus, posterior view; 21. cerci, surstylus and epandrium, lateral view. Scale: 0.1mm.

FIGURES 22–24. Mydaea apicinigra Wang, Li & Yang, sp. nov. male terminalia. 22. sternite V, ventral view; 23. cerci, surstylus and epandrium, posterior view; 24. cerci, surstylus and epandrium, lateral view. Scale: 0.1 mm.