Trypetisoma (Trypaneoides) menglunensis, 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 : 45-48

Trypetisoma (Trypaneoides) menglunensis sp. nov.

( Figs. 31–40 )

Diagnosis. Face yellow, with nose-like process on middle of basal half. Scutellum with a pair of brown spots converge with mesonotum posterior margin spot and basal spot of 3st post-sutural acr. Male genitalia ( Figs. 36–40 ): surstylus consist of 1 anterior process and 1 posterior process; anterior process with setae, digitiform; posterior apical process along ventral apex extending out in lateral view.

Description. MALE. Body length 2.2–2.3 mm, wing length 2.5–2.6 mm. FEMALE. Unknown.

Head ( Fig. 31 ) pale yellow. Face yellow, with nose-like process on middle of basal half and with 2 brown transverse bands on middle and ventral margin; parafacial with 1 short brown band on middle of inner margin and with 1 elliptic brown spot on inner margin apically. Frons brownish yellow except anterior margin 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, disappear at anterior of occiput; ocellar triangle blackish brown, oc developed, longer 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 brown except yellow basally, nearly 1.4 times longer than high; arista blackish brown except yellow basally, pubescent. 1 brown triangular spot present between antenna and eye. Proboscis yellow to brownish yellow, with yellow and black hairs; palpus yellow except pale brown at apex, with black hairs.

Thorax ( Fig. 34 ) brown, with grayish yellow pruinescence. Mesonotum with 1 narrow brown median band indistinctly, extending from anterior margin to anterior of scutellum, posterior margin with a pair of triangular brown spots, postpronotum with posterior margin surrounded by 1 thin brown band, 3–4 brown spots present between dc and supra-alar seta; posterior margin with a pair of spots; 1+3 dc, 1st post-sutural dc near transverse scutal suture, presutural dc closer to anterior margin than presutural acr; 1+3 acr (exclude prescutellar acr), in 2 rows; prescutellar acr absent; dc, acr and prescutellar 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, 2 anepst (the strongest one near posterior margin) and 3–4 short hairs; 2 kepst. Scutellum with grayish yellow pruinescence, a pair of brown spots converge with mesonotum posterior margin spot and basal spot of 3st post-sutural acr, 1 brown spot present in apical scutellar seta. Leg yellow, femora brown except pale yellow at apex, tibiae with 1 brown circle near base. Fore femur with 5 pd, 4 pv; fore tibia with 1 long dp, 2 short apv. Mid femur with 5 a, 1 app; mid tibia with 1 strong dp, 1 apv. Hind femur with 2 apv on apical half, 1 preapical ad; hind tibia with 1 dp, 1 short apv. Wing ( Fig. 32 ) anterior margin brown, with circular or irregular brown spots; 1 wide brown band along dm-cu extending from anterior margin to the posterior and with hyaline spots irregularly; subcostal cell brown; costa with 2nd, 3rd and 4th sections in proportion of 9.9: 3.3: 2.2; r-m beind middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 6.7: 3.4; ultimate section of CuA 1 about 1/7 of penultimate section. Halter pale yellow except knob brown.

Abdomen ( Fig. 35 ) blackish brown, with grayish white pruinescence, syntergosternite and epandrium yellow; tergites 2–6 each with 5 pairs of posterior margin setae, 4 pairs of grayish white spots, anterior margin with gayish white median spots, forming 1 discrete grayish white median longitudinal band. Male genitalia ( Figs. 36–40 ): syntergosternite semicircular and narrow in anterior view. Epandrium narrow apically and broad basally, trapeziform. Surstylus consist of 1 anterior process and 1 posterior process; anterior process broad with setae, digitiform; posterior apical process narrow, along ventral apex extending out in lateral view, incurved in posterior view. Hypandrium Y-shaped, with long inner process. Gonopod tubiform, longer than aedeagus, with 1 long hair basally, short hairs on apical half. Aedeagus with a pair of ventral sclerites, ventral sclerites connected by dorsal sclerites, with 1 median spine in interior in ventral view, 1 long ventral process basally in lateral view. Aedeagus deep concave apically. Aedeagus inner process tubiform, broad in ventral view but narrow in lateral view, shorter than aedeagus.

Type material. Holotype ( HAUST): 1 ♂, CHINA, Yunnan: Xishuangbanna, Menglun No. 55 area (920 m), 2007. IV. 24, Wenliang Li . Paratypes ( HAUST): 1 ♂, CHINA, Yunnan: Xishuangbanna, Menglun No. 55 area (920 m), 2007. IV. 24, Hui Dong .

Distribution. China (Yunnan).

Remarks. The new species is very similar to Trypetisoma (Trypaneoides) morio (de Meijere, 1910) from Indonesia, but the latter wing with at least 20 dark spots and blotches in cell cua 1.

Etymology. Latin, menglunensis , referring to the type locality Yunnan, Menglun.

Figures

FIGURES 31–35. Trypetisoma (Trypaneoides) menglunensis sp. nov. Male. 31. head, anterior view; 32. wing; 33. habitus, lateral view; 34. thorax, dorsal view; 35. abdomen, dorsal view.

FIGURES 36–40. Trypetisoma (Trypaneoides) menglunensis sp. nov. Male. 36. syntergosternite and epandrium, lateral view; 37. epandrial complex, posterior view; 38. syntergosternite, anterior view; 39. aedeagal complex, ventral view; 40. aedeagal complex, lateral view. Scale 0.1 mm.