Hebecnema kongi 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 : 545-548

Hebecnema kongi Wang, Li & Yang , sp. nov.

Figs. 1–12

Diagnosis. Eyes bare. acr 5+6; presut acr in 4 regular rows, setae of outer rows twice as long as small setulae of the inner rows. Distance between outer rows of presut acr equal to their distance to adjacent dc rows. Wings brown; tegula and basicosta black. Calypters light brown, halter brownish clouded. Legs black except hind tibia dark ochre yellow.

Description. Male. Body length 4.1–5.1mm, wing length 4.9–5.7mm.

Head ( Fig. 4 ). Antennae black, with grey brown pruinosity. Palpi, frontal vitta and fronto-orbital plates black, without pruinosity. Eyes bare. Frontal vitta about half as wide as anterior ocellus at narrowest point of frons. Fronto-orbital plate 1/4 as wide as anterior ocellus. Parafacials grey brown pruinose in anterodorsal view, 2/5 of postpedicel in width. Fronto-orbital plate flat, parafacial invisible in lateral view. Postpedicel approximately 3 times as long as wide. Arista plumose, the longest hair 1.2 times as long as width of postpedicel. fr with 5 strong pairs and 2 extremely weak pairs, on lower 2/3 of frons; oc about 2.5 times as long as distance between outer margins of posterior ocellus.

Thorax ( Fig. 1 ). Entirely black; h 2; ph 1; pres 1; npl 2; sa 2; ial 0+2; pal 2; acr 5+6; presut acr in 4 regular rows, setae of outer rows twice as long as small setulae of inner rows; distance between outer rows of presut acr equal to their distance to adjacent dc rows; dc 2+4; kepst 2+2 (the one below front weak); pra absent. Katepisternum with setae. Basisternum of prosternum, notopleuron, anepimeron, meron, metapleuron, and katepimeron bare. sctl 4 pairs; basal and apical sctl strong; prebasal and subapical sctl weaker.

Wings ( Fig. 5 ). Brown; the outer and posterior edges more pale. Tegula and basicosta black. Veins bare except C; Sc bow-shaped, M 1 and m-m straight. Calypters light brown, distinctly paler than wing; halter brownish clouded. Lower calypter tongue-shaped.

Legs ( Fig. 3 ). Black except ventral surface of hind tibia dark ochre yellow. Fore femur with complete rows of pd and pv respectively; fore tibia without median p. Mid femur with 4 pv at the base; mid tibia with 2 p. Hind femur with complete row of ad and 4 av; hind tibia without pd, but with 1 ad and 2 av.

Abdomen ( Fig. 2 ). Oviform. Black in ground color neither patch nor median dark stripe present. Sternite I bare. Sternite V as in figs. 6, 10.

Terminalia ( Figs. 7–12 ). Ground black. Lateral lobes of cerci wide and gradually tapering downwards, about 1/4 of the total length in posterior view. Cerci thick and bending forward, but sharp at bottom in lateral view. Surstylus thick, slightly curved backward in lateral view. Hypandrium spoon like, not tubular. Phallapodeme long and rod-like. Phallapodeme and pregonite strongly sclerotized. Angle between phallapodeme and epiphallus about 180 degrees. Postgonite shorter than epiphallus. Epiphallus slightly downwards curved and weakly sclerotized on apical part.

Female. Body length 3.9-5.0 mm, wing length 3.9-5.2mm. The other characteristics are the same with the male except for the following: frons 3 times as wide as distance between outer margins of posterior ocelli; parafacials 1/3 as wide as width of postpedicel; frons with 3 pairs of fr and 2 pair of orb, accompanied by some setulae; ocellar triangle reaching anterior margin of frons; acr 3–4+6; wings hyaline, not clouded; Calypters pale yellow; all tibiae yellowish-brown, the rest black.

Type material. Holotype male ( HAUST), CHINA: Zhejiang Province, Lishui City, Jingning County, Wangdongyang Nature Reserve , 27°41′20″N, 119°38′9″E, 24. IV. 2021, 1290.8 m, leg. Chaoyang Kong. Paratypes, 4 males and 3females ( HAUST), same data as holotype .

Distribution. China (Zhejiang).

Remarks. This new species is similar to H.vespertina (Fallén, 1823) , but different from the latter in the following points: kepst 2+2; halter brownish clouded; lateral lobes of cerci wider in posterior view; surstylus slightly curved backward in lateral view. In H.vespertina kepst is 1+2; the halter yellow; lateral lobes of cerci are slender in posterior view; and the surstylus is straight downward in lateral view ( Gregor et al., 2016; Michelsen, 2019).

Etymology. The species named after the collector Chaoyang Kong. Chinese name of the species: “ fikfss ḁ ”.

Figures

FIGURES 1–5. Hebecnema kongi Wang, Li & Yang, sp. nov. male. 1. head and thorax, dorsal view; 2. abdomen, dorsal view; 3. habitus, lateral view; 4. head, anterior view; 5. wing. Scale: 1mm.

FIGURES 6–9. Hebecnema kongi Wang, Li & Yang, sp. nov. male terminalia. 6. sternite V, ventral view; 7. phallic complex, lateral view; 8. cerci, surstylus and epandrium, posterior view; 9. cerci, surstylus and epandrium, lateral view. Scale: 0.1mm.

FIGURES 10–12. Hebecnema kongi Wang, Li & Yang, sp. nov. male terminalia. 10. sternite V, ventral view; 11. cerci, surstylus and epandrium, posterior view; 12. cerci, surstylus and epandrium, lateral view. Scale: 0.1mm.