Homoneura (Homoneura) singularis

Shen, Rongrong, Shi, Li, Li, Wenliang & Wang, Junchao, 2018, A new species of subgenus Homoneura from Northern China, with information of 12 species newly recorded (Diptera: Lauxaniidae: Homoneura), Zootaxa 4418 (6), pp. 501-525 : 515

Key to separate 14 species in the Homoneura (Homoneura) singularis group

[Modified from Shi and Yang 2014]

1. Wing with a distinct brown spot at tip of R1.................................................................2

- Wing without brown spot at tip of R1, at most subcostal cell dark apically......................................... 7

2. Wing with brown spot at tip of R1 connected with spot on r-m .................................................. 3

- Wing with brown spot at tip of R1 separated from spot on r-m ...................................................4

3. Surstylus short with a concavity between two acute processes; postgonite narrow, not extending to tip of phallus in ventral view............................................................................ H. (H.) concava Sasakawa

- Surstylus with 3 acute processes in posterior view; postgonite broad, extending to tip of phallus in ventral view.................................................................................... H. (H.) zhejiangensis Shi and Yang

4. Parafacial with black inner margin........................................................................ 5

- Parafacial without black inner margin...................................................................... 6

5. Syntergosternite semicircular; hypandrium nearly H-shaped, with a middle ventral process; phallus with a pair of furcated lateral processes at middle in ventral view...................................... H. (H.) fengyangshanica Shi and Yang

- Syntergosternite circular; hypandrium transverse bar-like, without middle ventral process; phallus without lateral processes in ventral view................................................................... H. (H.) longicornis Sasakawa

6. Wing with a brown preapical spot on M1, but no stripe-like spot on apical half of CuA1; surstylus originated from ventral margin of epandrium, broad knife-like in lateral view; postgonite short and wide, acute apically................................................................................................ H. (H.) aulatheca Sasakawa and Ikeuchi

- Wing with a brown apical spot and a narrow subapical spot on apical 1/2 of M1, and a brown thin transverse stripe-like spot on apical half of CuA1; surstylus originated from inside of epandrium, falciform in lateral view; postgonite slender, blunt apically.............................................................................. H. (H.) falcata Shi and Yang

7. Mesonotum without brown stripes; abdomen without spot.....................................................8

- Mesonotum with 2–6 brown stripes; abdomen with spots..................................................... 10

8. Wing with brown spots on R4+5 and M1 separated; surstylus not as below.......................................... 9

- Wing with brown spots on R4+5 and M1 confluent, forming a large brown area between two apical spots; surstylus curved and constricted at middle................................................................ H. (H.) latifrons Malloch

9. Abdomen dark brown, surstylus consisting of a small triangular anterior ventral process with setulae and a long digitiform apical process with a tiny middle tooth and acute tip in lateral view.................... ... H. (H.) tianlinensis Gao and Yang

- Abdomen pale yellow; surstylus with claviform single process ( Fig. 54 )...................... H. (H.) lamellata (Becker)

10. Mesonotum with 4–6 brown stripes; epandrium with a blunt triangular subapical process in lateral view................ 11

- Mesonotum with 2 brown stripes; epandrium straight on posterior margin, without triangular subapical process in lateral view; surstylus claviform, bulged at middle in lateral view......................................................... 12

11. Arista pubescent, with longest ray shorter than 1/4 height of 1 st flagellomere ; mesonotum with four brown medial stripes and two postsutural lateral stripes; hypandrium broad, hypandrial apodeme long; phallus with a pair of crossed subuliform dorsal processes in ventral view (Shi and Yang, 2014: fig. 298)................................... H. (H.) subvittata Malloch

- Arista short plumose, with longest ray as long as 1/2 height of 1 st flagellomere ; mesonotum with four brown medial stripes; hypandrium narrow, hypandrial apodeme short; phallus without crossed subuliform dorsal processes in ventral view................................................................................... H. (H.) didyma Yang, Hu and Zhu

12. Ctenidium on fore femur with 15–16 short setae; surstylus long claviform, extended ventrally and acute apically with a small ventral process................................................................... H. (H.) vittigera Sasakawa

- Ctenidium on fore femur with 11–12 short setae; surstylus not as above.......................................... 13

13. Surstylus curved as a sickle with an acute apical tooth, several small teeth on dorsal margin and long setulae on dorsal and ventral margins; phallus narrow with a wide and deep apical concavity in ventral view, and apical margin broad and lateral sclerite turned outside apically in lateral view.......................................... H. (H.) hongmaoensis Shi and Yang

- Surstylus straight claviform, acute apically in lateral view; phallus with truncate apically in ventral view.......................................................................................... H. (H.) singularis Yang, Hu and Zhu

Figures

FIGURES 54–58. Homoneura (Homoneura) lamellata (Becker, 1895). Non-type male genitalia: 54. syntergosternite and epandrial complex, lateral View; 55. epandrial complex, posterior View; 56. syntergosternite, anterior View; 57. phallus complex, Ventral View; 58. phallus complex, lateral View.