Homoneura (Homoneura) semicircularis, Shi, Li & Yang, Ding, 2009

Shi, Li & Yang, Ding, 2009, Notes on the Homoneura (Homoneura) beckeri group from the Oriental Region, with descriptions of ten new species from China (Diptera: Lauxaniidae), Zootaxa 2325, pp. 1-28 : 17-21

Homoneura (Homoneura) semicircularis sp. nov.

( Figs. 8 , 47–51 )

Diagnosis. Face pale brown without spot. Antenna 1st flagellomere black except pale yellow on basal 1/3. A black triangular spot present between antenna and eye. Mesoscutum with shining white pollen on anterior margin; with a pair of narrow yellow stripes along dc rows. Wing with a brown elliptical spot on dm-cu. Abdomen yellow with sparse silvery white pollen, tergites 2–5 each with a wide black brown band on posterior 1/2 –2/3 confluent with a black triangular median spot, and tergite 6 with a brown spot.

Description. MALE. Body length 3.9–4.2 mm, wing length 4.3–4.4 mm. FEMALE. Body length 4.0– 4.3 mm, wing length 4.5–4.8 mm.

Head pale yellow. Face pale brown. Frons dark yellow, about as long as wide and parallel–sided, with two narrow grayish black stripes along or rows and a narrow brown triangular median stripe, extending to ocellar triangle; ocellar triangle grayish black; oc strong, as long as anterior or, anterior or slightly shorter than posterior or. Gena about 1/5 height of eye. Occiput with a wide grayish black median stripe confluent with ocellar triangle. Antenna black except 1st flagellomere pale yellow on basal 1/3, 1st flagellomere 1.6 times longer than high; arista long plumose, black except brownish base, with longest hairs longer than height of 1st flagellomere. A black triangular spot present between antenna and eye. Proboscis brownish yellow, with yellowish hairs and blackish hairs; palpus yellow with blackish hairs.

Thorax brownish black with whitish gray pollen. Mesoscutum with shining white pollen on anterior margin; with a pair of narrow yellow stripes along dc rows; 0+3 dc (anterior dc near transverse scutal suture), acr in 6 somewhat irregular rows; prsc shorter than 1st post–sutural dc. A yellow spot present behind postpronotum. Anepisternum blackish brown and katepisternum brownish yellow, both with whitish gray pollen; anepisternum with a yellow median spot; katepisternum with a blackish brown spot on anterior corner, posterior kepst with a large blackish brown base spot. Scutellum brownish black except yellow lateral and apical margin, with whitish gray pollen. Legs pale yellow to brownish yellow, tarsomere 5 yellow; sometimes mid tibia blackish brown at dorsal tip, hind tibia with an incomplete brown basal ring. Fore femur with 4 strong pv and 5–6 pd, ctenidium with 12–13 short bristles; fore tibia with 1 long preapical ad and 1 short apv. Mid femur with 4 a and 1 apv; mid tibia with 1 strong preapical ad and 3 strong apv. Hind femur with 1 preapical ad; hind tibia with 1 weak preapical ad and 1 short apv. Wing ( Fig. 8 ) hyaline, with a brown elliptical spot on dm-cu; subcostal cell hyaline; costa with 2nd (between R1 and R2+3), 3rd (between R2+3 and R4+5) and 4th (between R4+5 and M1) sections in proportion of 2.4 mm: 0.7 mm: 0.4 mm; r-m before middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 1.6 mm: 2.1 mm; ultimate section of CuA1 about 1/8 of penultimate. Halter yellow.

Abdomen yellow with sparse silvery white pollen, tergites 2–5 each with a wide black brown band on posterior 1/2 –2/3 confluent with a black triangular median spot, and tergite 6 with a brown spot. Male genitalia ( Figs. 47–51 ): protandrium semicircular; epandrium broad, nearly rectangular, with a pair of long subdorsal bristles and a row of short hard apical bristles, surstylus long, undulating, incurved claviform; hypandrium with a Y–shaped ventral process and hypandrial apodeme short; gonopod coniform, slightly curved; aedeagus with a small apical incision and a pair of goblet–like dorsal sclerites; dorsal sclerites constricted at middle, with a pair of acuate dorsal middle processes and a pair of apical processes slightly furcated and contorted; aedeagal apodeme shorter than aedeagus. Cerci with a pair of long hairs

Type material. Holotype 3 ( CAUC), CHINA, Zhejiang Province: Longquan, Fengyangshan National Nature Reserve, Datianping, 30. VII. 2007, Yajun Zhu. Paratypes: CHINA, Zhejiang Province: 1 3 ( CAUC), 2 Ƥ ( CAUC), data same as holotype; 1 3 ( CAUC), Longquan, Fengyangshan National Nature Reserve, Huangmaojian, 29. VII. 2007, Yajun Zhu.

Distribution. China (Zhejiang).

Remarks. The new species is somewhat similar to Homoneura (Homoneura) tortifurcata sp. nov. from China (Hainan) in the following characters: a pale brown triangular spot present between antenna and eye; hind tibia with an incomplete brown basal ring; wing with a brown spot on dm-cu; abdominal tergites 3–5 each with a brownish black posterior band; hypandrium with a pair of wide claviform ventral process, hypandrial apodeme indistinct; aedeagal apodeme very short. But it can be separated the latter by the following characters: the face being pale brown; the antennal 1st flagellomere being black except pale yellow on basal 1/3; the tarsomere 5 being yellow; the anepisternum being blackish brown with a yellow median spot; the abdominal tergites 2–5 each having a black triangular median spot confluent with a black brown posterior band, the tergite 6 having a brown spot; the epandrium having a pair of long subdorsal bristles and a row of short hard apical bristles, but no deep posterior dorsal median incision; the surstylus being long, undulating, incurved claviform; the aedeagus having a pair of goblet–like dorsal sclerites; dorsal sclerites being constricted at middle and having a pair of acuate dorsal middle processes and a pair of apical processes slightly furcated and contorted. In H. (H.) tortifurcata , the face pale is yellow; the antenna 1st flagellomere is entirely black; the tarsomere 5 is brownish black on apical 1/2; the anepisternum is pale yellow with a large grayish black spot; the abdominal tergites 3–5 have no black triangular median spot confluent with a black brown posterior band, the tergite 6 has no brown spot; the epandrium has a deep posterior dorsal median incision, without long subdorsal bristles and short hard apical bristles; the surstylus is consisting of a broad hairy digitiform process and a narrow curved bar–like process; the aedeagus has a pair of lateral concave at base, a pair of acuate lateral processes and a pair of wide S–shaped and furcated dorsoapical processes on dorsal sclerites.

Etymology. Latin, semi-, prefix meaning half + circularis, meaning circular or round, referring to the protandrium being semicircular; a feminine adjective.

Figures

FIGURES 1 – 11. Wing. 1. Homoneura (Homoneura) apicomata sp. nov.; 2. H. (H.) columnaria sp. nov.; 3. H. (H.) convergens sp. nov.; 4. H. (H.) flavida sp. nov.; 5. H. (H.) latissima sp. nov.; 6. H. (H.) nigritarsis sp. nov.; 7. H. (H.) occipitalis Malloch; 8. H. (H.) semicircularis sp. nov.; 9. H. (H.) tortifurcata sp. nov.; 10. H. (H.) yinggelingica sp. nov.; 11. H. (H.) zhangae sp. nov..

FIGURES 47 – 51. Homoneura (Homoneura) semicircularis sp. nov. Male. 47. protandrium and epandrium, lateral view; 48. protandrium, anterior view; 49. epandrial complex, posterior view; 50. aedeagal complex, ventral view; 51. aedeagal complex, lateral view. Scale 0.1 mm.