Trypetisoma (Trypaneoides) endosclerita, 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 : 37-39

Trypetisoma (Trypaneoides) endosclerita sp. nov.

( Figs. 1–10 )

Diagnosis. Face with a concave. Antennal 1 st flagellomere brown with yellow basally. Mesonotum with a pair of indistinct narrow dark grey median bands. Male genitalia ( Figs. 6–10 ): 1 membranous ventral process with a pair of brown bands on syntergosternite. Surstylus consist of 1 anterior process and 1 posterior process.

Description. MALE. Body length 2.7 mm, wing length 3.5 mm. FEMALE. Body length 2.4–2.8 mm, wing length 3.5–4.0 mm.

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

Thorax ( Fig. 4 ) brown, with grayish yellow pruinescence. Mesonotum with a pair of indistinct narrow dark grey median bands extending from anterior margin to presutural dc; postpronotum with posterior margin surrounded by 1 thin brown band; 1+3 dc, 1st post-sutural dc near transverse scutal suture, anterior dc closer to anterior margin than anterior acr; 1+3 acr and in 2 rows, 1st post-sutural acr on transverse scutal suture, prescutellar acr absent; dc, acr and a each with 1 brown basal spot. Anepisternum and katepisternum brown, with gray pruinescence; anepisternum with 2 brown spots near dorsal margin, 1 brown spot near ventral margin, 2 anepst (the longest one near posterior margin) and 3–4 short hairs; 2 kepst. Scutellum with grayish yellow pruinescence. Leg yellow except apical tarsi brown. Fore femur with 5 pd, 4 pv; fore tibia with 1 long dp, 2 short apv. Mid femur with 4 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. 2 ) 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 7.6: 2.7: 1.8; r-m behind middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 5.5: 2.8; ultimate section of CuA 1 about 1/7 of penultimate section. Halter pale yellow except knob brown.

Abdomen ( Fig. 5 ) blackish brown, with grayish white pruinescence, but syntergosternite and epandrium brownish yellow; tergites 2–6 each with 4–5 pairs of posterior margin setae on grayish white basal spots, anterior margin with 1 row small grayish white spots. Male genitalia ( Figs. 6–10 ): 1 membranous ventral process with a pair of brown bands on syntergosternite; epandrium with setae on brown spots. Surstylus consist of 1 anterior process and 1 posterior process; anterior process 1/2 width of epandrium, with seta; posterior process nearly as wide as anterior part, without seta, truncate apically. Hypandrium U-shaped and broad. Gonopod tubiform, shorter than aedeagus, with long hairs at apex, and sightly curved. Aedeagus with 1 inner sclerite about 1/2 length of aedeagus, base of aedeagus narrow in lateral view, apex slender and vertical to aedeagus. Aedeagus without apical concave. Aedeagal apodeme tubiform and strong, shorter than aedeagus, most membranous, basal half with a pair of sclerites in ventral view.

Type material. Holotype (HAUST): 1 ♂, CHINA, Yunnan: Lijiang, Gaoshan Botanical Garden, Wenhai , 2009. VI. 19, Feng Qi . Paratypes (HAUST): 1 ♀, data same as holotype; 1 ♀, CHINA, Yunnan : Lijiang , Yulong Snow Mountain , 2006. V. 28, Xingyue Liu

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Distribution. China (Yunnan).

Remarks. The new species is very similar to Trypetisoma (Trypaneoides) jinpingensis sp. nov. from China (Yunnan) in wing type. But the latter tergites 2–6 each with 1 irregular transverse band, tergite 2 with a pair of irregular ventral blackish brown spots, tergites 3–6 with a pair of irregular blackish brown median spots; aedeagus with 1 long ventral process basally, without inner sclerite. The new species tergites 2–6 each with 4–5 pairs of posterior margin setae on grayish white basal spots, 1 row small grayish white spots on anterior margin, aedeagus without ventral process but with inner sclerite.

Etymology. Latin, endosclerita , meaning inner sclerite; referring to the aedeagus of the new species with 1 inner sclerite.

Figures

FIGURES 1–5. Trypetisoma (Trypaneoides) endosclerita sp. nov. Male. 1. head, anterior view; 2. wing; 3. habitus, lateral view; 4. thorax, dorsal view; 5. abdomen, dorsal view.

FIGURES 6–10. Trypetisoma (Trypaneoides) endosclerita sp. nov. Male. 6. syntergosternite and epandrium, lateral view; 7. epandrial complex, posterior view; 8. syntergosternite, anterior view; 9. aedeagal complex, ventral view; 10. aedeagal complex, lateral view. Scale 0.5 mm.