Dicranomyia (Erostrata) serrata Dai & Chen & Ma & Guo & Zhang 2026, sp. nov.

Dicranomyia (Erostrata) serrata Dai & Zhang sp. nov. Figs 8, 9, 10 Type material. Holotype: China • 1 ♂; Sichuan Province, Chongzhou City, Jiguanshan Township, Shaoyaogou Protection Station; 30 ° 45 ' 47.56 " N, 103 ° 13 ' 56.62 " E; 1400 m a. s. l.; 29 Jul. 2016; Yuqiang Xi leg.; CAU. Diagnosis. Prescutum and presutural scutum brown with anterior 1 / 3 margin slightly darker. Postsutural scutum brown with median area slightly paler. Pleuron brown, darker near base of wing. Wing pale brown, with darker areas on upper 1 / 2 (veins Sc, Rs, R 1 – R 4). Vein Sc ending opposite about 2 / 3 length of Rs, m-cu just beyond base of dm. Tergite 9 posterior margin with a broad, U-shaped notch, forming two elongate projections. Gonostylus tip distinctly concave, forming a thin upper arm with 4–5 teeth and a circular lower arm densely covered with short, black spines. Paramere tip subacute, with extreme tip bending inward abruptly. Aedeagus tip forked and recurved, with subtip constricted. Description. Male. Body length 5.3 mm, wing length 5.0 mm. Head (Fig. 8 A, B). Brown, vertex and occiput darker. Setae on head dark brown. Antennae with 14 segments, brown. Scape cylindrical, 1.5 times as long as wide. Pedicel oval, 1.5 times as long as wide, tip slightly enlarged. Flagellomeres long-oval, outermost flagellomere slightly elongate and tapering, each with 3–4 verticils. Rostrum brown with dark-brown setae. Palpus dark brown, one segment with dark-brown setae observed (additional segments likely absent due to specimen condition). Thorax (Fig. 8 C). Pronotum brown. Prescutum and presutural scutum brown with anterior 1 / 3 margin slightly darker. Postsutural scutum brown with median area slightly paler. Scutellum dark brown. Mediotergite brown with anterior margin slightly darker. Pleuron (Fig. 8 A) brown, ventral side of katepisternum slightly paler. Thorax with dark-brown setae. Coxae (Fig. 8 A) pale brown; trochanters slightly paler in comparison to coxae; femora brown, with base slightly paler; tibiae brown. Setae on legs dark brown. Wing (Fig. 8 E) pale brown, with weakly darker areas on upper 1 / 2 (veins Sc, Rs, R 1 – R 4); veins brown. Venation: Sc ending opposite about 2 / 3 length of Rs; sc-r very close to tip of Sc; Rs arising from middle of wing, base slightly curved, nearly straight; cell dm closed, 2.0 times as long as wide; m-cu just beyond base of dm. Halter (Fig. 8 D) brown, knob paler. Abdomen (Fig. 8 A). Segments 1–8 brown, with segments 1 and 8 darker; sternite 7 (Fig. 9 C) with an internal sac, broad basally, slightly narrowed towards apex, constricted medially, and bluntly rounded at the tip, bearing a broadly U-shaped opening. Setae on abdomen dark brown. Hypopygium (Figs 9, 10). Generally brown, tip of tergite 9 darker. Tergite 9 (Fig. 9 A, D) nearly trapeziform, medially with longitudinal line, posterior margin with a broadly U-shaped notch, forming two elongate blackened projections. Each projection with 4–5 setae at tip, each side of tergite 9 also with 6–8 setae. Gonocoxite (Fig. 9 A, B) in dorsal view cylindrical, tip slightly enlarged, inner side concave at midlength, and in ventral view fusiform, inner side slightly convex; a ventromesal lobe at its apical third, with tip slightly acute, length about 1 / 2 of gonocoxite. Gonostylus (Fig. 9 A, B, E, F) length about 1 / 2 of gonocoxite, outer side at base with two long, stout, transparent setae (Fig. 9 E); tip distinctly concave, forming a thin upper arm with 4–5 teeth and a circular lower arm densely covered with short, black spines (Fig. 9 F). Paramere (Fig. 10 A – D) in lateral view broad at base, narrowed and nearly straight apically, tip subacute; with extreme tip bending inward abruptly in dorsal view. Aedeagus (Fig. 10 A – C, E) long, extending to about tip of gonostylus, widened at base, tip forked and recurved; subtip constricted. Female. Unknown. Etymology. The specific epithet is a Latin adjective serrata (meaning “ serrated ”). It refers to the four or five teeth arranged in a serrated pattern on the upper arm of the gonostylus. Distribution. China (Sichuan). Remarks. The new species is placed in D. (Erostrata) based on the reduction of the rostrum, the wing venation (vein Sc ending at about 2 / 3 the length of Rs) and the male hypopygial characters (possessing only one pair of gonostyli). Its gonostylus bears strong black spines on the inner side, which places it within the “ spinose ” clade of Kim and Bae (2023). The new species is most similar to D. (E.) melas, D. (E.) globithorax, and D. (E.) globulithorax, but it can be distinguished from all three by the posterior margin of tergite 9, which has a broadly U-shaped notch forming two elongate projections and the gonostylus tip distinctly concave, forming a long spine and a circular protuberance densely covered with black spines. In addition, it differs from D. (E.) melas in having a paramere with a less strongly curved apex and lacking a subapical black point; from D. (E.) globithorax in having a less gibbous mesothorax and the different shape of the internal sac of sternite 7; and from D. (E.) globulithorax in having a more slender aedeagus and a paramere with a less acute apex. The type locality, situated on the eastern edge of the Hengduan Mountains in Sichuan, is the farthest inland record for the subgenus. It fills a crucial gap between the known Oriental Region species of the Himalayas and the coastal East Asian species.