Trypetisoma (Trypaneoides) trimaculata, Li & Qi & Yang, 2019

Li, Wenliang, Qi, Ling & Yang, Ding, 2019, First record of the genus Trypetisoma Malloch, 1924 (Diptera, Lauxaniidae) for China with nine species, Zootaxa 4608 (1), pp. 35-64 : 51-54

Trypetisoma (Trypaneoides) trimaculata sp. nov.

( Figs. 51–60 )

Diagnosis. Face with 1 brown V-shape median spot and 1 brown concave near ventral margin, with 1 brown median spot on ventral margin. Mesonotum with 1 narrow brown median band extending from anterior margin to anterior of 3st post-sutural dc. Male genitalia ( Figs. 56–60 ): syntergosternite with a pair of short ventral process at ventral apex.

Description. MALE. Body length 2.5–3.4 mm, wing length 3.0– 3.8 mm. FEMALE. Unknown.

Head ( Fig. 51 ) pale yellow. Face yellow except lateral margin brown, with 1 brown V-shape median spot and 1 brown concave near ventral margin, with 1 brown median spot on ventral margin; parafacial with 1 brown short longitudinal band on middle and with 1 circular brown spot on inner margin apically. Frons yellow with grayish white pruinescence, wider than long, trapeziform, anterior margin narrower than the posterior, with a pair of narrow brown median bands, extending to ocellar triangle; ocellar triangle blackish gray, oc developed, shorter than anterior or; anterior or longer than half length of posterior or; oc each with 1 blackish brown basal spot. Gena about 1/5 eye height. Occiput with gray pruinescence. Antenna yellow; 1 st flagellomere nearly 1.3 times longer than high; arista brown except yellow basally, pubescent. 1 brown triangular spot present between antenna and eye. Proboscis pale yellow, with yellow and black hairs; palpus pale yellow with black hairs.

Thorax ( Fig. 54 ) brown, with grayish yellow pruinescence. Mesonotum with 1 narrow brown median band extending from anterior margin to anterior of 3st post-sutural dc, postpronotum with posterior margin surrounded by 1 thin brown band, a pair of black triangular posterior spots extending to scutellum; 1+3 dc, 1st post-sutural dc near transverse scutal suture, presutural dc closer to anterior margin than presutural acr; 1+3 acr, in 2 rows; without prescutellar acr; dorsocentral acr and acr each with 1 brown basal spot. Anepisternum and katepisternum with gray pruinescence, anepisternum with 2 brown spots near dorsal margin, 1 brown spot near ventral margin, 3 anpest (the strongest one near posterior margin) and 3–4 short hairs; 2 kepst. Scutellum with setae on brown basal spots. Leg yellow, femora pale brown to brown except pale yellow at apex (fore femur pale brown, sometimes all femora yellow), tibiae with 1 brown circle near base (fore tibiae with 1 brown circle or incomplete circle). Fore femur with 5 pd, 4 pv; fore tibia with 1 long dp, 1 short apv. Mid femur with 5 a, 1 app; mid tibia with 1 strong dp, 2 strong apv. Hind femur with 2 apv on apical half, 1 preapical ad; hind tibia with 1 dp, without short apv. Wing ( Fig. 52 ) with anterior margin brown, lighten along posterior margin, with circular or irregular hyaline spots and with brown spots; 1 wide brown band along dm-cu extending from anterior margin to posterior margin and with hyaline spots irregularly; subcostal cell brown; costa with 2nd, 3rd and 4th sections in proportion of 6.6: 2.3: 1.7; r-m beind middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 4.7: 2.2; ultimate section of CuA 1 about 1/9 of penultimate section. Halter pale yellow except knob brown.

Abdomen ( Fig. 55 ) blackish brown, with grayish white pruinescence, but tergite 2 anterior margin yellow (sometimes tergite 3 anterior margin yellow); tergites 2–6 each with 5 pairs of posterior margin setae on pale yellow basal spots; anterior margin with 1 row irregular pale yellow spots, and the pale yellow median spots forming 1 discrete pale yellow median longitudinal band. Male genitalia (Figs. 56–60): syntergosternite with a pair of short ventral process at ventral apex. Surstylus consist of 1 anterior process and 1 posterior process, anterior process broad with setae in lateral view, posterior process acute apically, and as surstylus extending out epandrium ventral apex in lateral view. Hypandrium Y-shaped, inner process membranous. Gonopod tubiform, acute apically, with 4 long hairs, middle incurved in lateral view, apex curved outward, apex curved in lateral view. Aedeagus with 1 ventral process on middle of base.Aedeagus without apical concave.Aedeagal apodeme tubiform, with membranous apical half, shorter than aedeagus.

Type material. Holotype (HAUST): 1 ♂, CHINA, Guangxi: Nanning, Daming Mountain, 2011. VIII. 5–10, Hui Dong . Paratypes (HAUST): 1 ♂, CHINA, Guangxi: Nanning, Daming Mountain, 2011. V. 28, Tingting Zhang ; 1 ♂, CHINA, Yunnan: Yingjiang, Xima , 2012. V. 4, Feiyang Liang .

Distribution. China (Guangxi, Yunnan) Remarks. The new species is very similar to Trypetisoma (Trypaneoides) poecilus (Shatalkin, 1998) from the Palaearctic region in the following characteristics: parafacial with 3 brown spots, but it can be separated from the latter in the following characteristics: the latter tibia without brown circle, tergites 1–2 yellowish gray, other tergites dark brown, with gray posterior margin spot; the new species tibia with brown circle near base, abdomen blackish brown, tergite 2 yellow on anterior margin (sometimes tergite 3 anterior yellow on margin); tergites 2–6 with pale yellow posterior margin spots, 1 row irregular pale yellow spots on anterior margin, and the pale yellow median spots forming 1 pale yellow median longitudinal band discretely.

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Etymology. Latin, trimaculata , meaning three spots, referring to the new species parafacial with 1 brown spots respectively between antenna base and eye, on middle and at apex.

Figures

FIGURES 51–55. Trypetisoma (Trypaneoides) trimaculata sp. nov. Male. 51. head, anterior view; 52. wing; 53. habitus, lateral view; 54. thorax, dorsal view; 55. abdomen, dorsal view.

FIGURES 56–60. Trypetisoma (Trypaneoides) trimaculata sp. nov. Male. 56. syntergosternite and epandrium, lateral view; 57. epandrial complex, posterior view; 58. syntergosternite, anterior view; 59. aedeagal complex, ventral view; 60. aedeagal com- plex, lateral view. Scale 0.5 mm.