Cerodontha ( Dizygomyza ) granditerga, Fu & Shi & Wang, 2026

Fu, Xin-Ting, Shi, Li & Wang, Shi-Mingzhe, 2026, Three new Cerodontha species from Inner Mongolia and Qinghai with a checklist of thirty-two Chinese species (Diptera, Agromyzidae), ZooKeys 1266, pp. 55-101 : 55-101

Cerodontha ( Dizygomyza) granditerga sp. nov.

Fig. 8 A – M

Type material.

China, Qinghai Province: Holotype. • ♂ ( IMAU), Menyuan County, Zhugu Town, Sigou , 3344 m, 37°06'16.46"N, 102°36'04.03"E, 28. VII. 2021, leg. Li Shi . Paratypes. • 1 ♂ ( IMAU), same data as for holotype ; • 2 ♂♂ ( IMAU), Qilian County, Lujiaogou , 3417 m, 38°06'31.22"N, 100°28'42.33"E, 01. VIII. 2021, leg. Li Shi . DNA sequence number PX 103174 from GenBank.

Diagnosis.

Fronto-orbital plate blackish brown, moderately shiny, ~ 1 / 3 width of frons; two inclinate ori and two reclinate ors. Lunule brown, twice as wide as high, projecting above frons in lateral view. Calypter and margin yellow, fringe brown. Epandrium broad with a long downward-curved spine on inner margin of dorsal 3 / 4; surstylus directed inwards, with ~ 25 short and thick spines; distiphallus short S-shaped in lateral view, and divided into one pair of unparallel tubules, approx. as long as mesophallus in ventral view.

Description.

Male (Fig. 8 A – M ). Body length 2.0– 2.3 mm; wing length 2.5–2.8 mm.

Head (Fig. 8 B, E ) blackish brown. Frons dark brown, projecting slightly above eye in lateral view, and ~ 1.7 × as wide as eye in dorsal view; fronto-orbital plate blackish brown, moderately shiny, ~ 1 / 3 width of frons; two inclinate ori and two reclinate ors; orbital setulae sparse and thin, reclinate in a single row. Ocellar triangle black; ocellar setae conspicuously weaker than ors. Lunule brown, twice as wide as high, projecting above frons in lateral view. Antennal first flagellomere enlarged with pale pubescence; arista conspicuously thickened on basal 1 / 4. Facial keel distinctly raised. Gena yellowish brown, ~ 1 / 2 height of eye, highest point located at middle of eye. Clypeus pale yellow; palpus black with three prominent setae at apex.

Thorax (Fig. 8 C, D ) black. Mesonotum and scutellum moderately shiny; 1 + 3 dc; acr in four irregular rows; two postsutural intra-alar, one presutural and two strong postsutural supra-alar setae. Anepisternum with one anepisternal seta, two long setulae and six short setulae. Katepisternum with one katepisternal seta and five short setulae. Legs black, only fore femora with yellow knees. Wing: Costa with 2 nd (between R 1 and R 2 + 3), 3 rd (between R 2 + 3 and R 4 + 5) and 4 th (between R 4 + 5 and M 1) sections in proportion of 4.7: 1.9: 1; ultimate and penultimate sections of M 1 in proportion of 2.2: 1; r-m slightly beyond middle of discal cell; ultimate and penultimate sections of M 4 in proportion of 1: 1. Calypter and margin yellow, fringe brown. Halter pale yellow.

Abdomen (Fig. 8 G ) dark brown, tergites 1–6 yellowish on posterior margin. Genitalia (Fig. 8 H – M ): epandrium broad with a long downward-curved spine on inner margin of dorsal 3 / 4; surstylus with ~ 25 short and thick spines; mesophallus dark completely, broad on apical 1 / 3; mesophallus and distiphallus wrapped in a layer of pale membrane; distiphallus short S-shaped in lateral view, and divided into one pair of unparallel tubules, approx. as long as mesophallus in ventral view; ejaculatory apodeme with blade brown and stem wide; sperm pump yellowish white. Cercus with a long strong seta downward.

Female. Unknown.

Distribution.

China ( Qinghai).

Etymology.

The specific name of this new species compounds the Latin prefix grandi - (meaning large) and the Latin noun terga (meaning tergite), referring to the notably broad epandrium.

Remarks.

The new species has the relatively largest epandrial complex which can be easily distinguished from other species of the subgenus Dizygomyza .

Figures

Figure 8. Cerodontha (Dizygomyza) granditerga sp. nov. Paratype male. A. Habitus, lateral view; B, E. Head, lateral and dorsal view; C, D. Thorax, dorsal and lateral view; F. Wing; G. Abdomen, lateral view; H, K. Genitalia, lateral and ventral view; I, L. Epandrial complex, posterolateral and posterior view; J, M. Ejaculatory apodeme, lateral and ventral view. Scale bars: 0.5 mm (A – G); 0.1 mm (H – M).