Organopoda acutula, Cui & Xue & Jiang, 2019

Cui, Le, Xue, Dayong & Jiang, Nan, 2019, A review of Organopoda Hampson, 1893 (Lepidoptera, Geometridae) from China with description of three new species, Zootaxa 4651 (3), pp. 434-444 : 436-437

Organopoda acutula sp. nov.

Figs 2 , 11 , 19

Type material. Holotype, ♂, CHINA: Gansu: Wenxian, VI–IX.2002, coll. Wang Hongjian. Paratypes: Gansu: 1♀, same as holotype (slide no. 4418) ; 1♀, Bikou, Bifenggou , 720 m, 8–10.VIII.2016, coll. Cheng Rui & Jiang Shan. Hunan: 1♂, Sangzhi, Bamaoxi, Shuitiannan , 370 m, 16.VIII.2009, coll. Wei Zhongmin ; 1♀, Sangzhi , Badagong Shan, Xiaozhuangping, 14. VI.2015, coll. Zhao Kaidong; 1♂, Zhangjiajie , Wulingyuanqu, Wenfeng, 10. VI.2015, coll. Yao Jian & Zhao Kaidong. Sichuan: 2♂, Emei Shan, Qingyin’ge , 800–1000 m, 26.IV.1957, 16.VII.1957, coll. Zhu Fuxing (slide no. 3463) . All specimens of type series deposited in IZCAS .

Description. Head. Antennae weakly serrate in male and filiform in female, shaft scattered with short cilia; dorsal side covered with white scales at base. Frons reddish brown, not protruding. Labial palpi reddish brown on dorsal side and yellow on ventral side, third segment about a half-length of second segment, extending beyond frons. Vertex pale white.

Thorax. Patagia deep yellowish brown. Tegulae and thorax greyish brown. Forewing length: male 15–16 mm, female 14–15 mm. Wing colour deep yellowish brown, darker on costal area of forewing; transverse lines serrate. Forewing with antemedial line brown and indistinct; discal spot small and black ringed; medial line deep brown, incurved below vein CuA 1, indistinct; postmedial line sometimes indistinct and forming black spots on veins, nearly parallel with medial line; terminal line black and triangular between veins. Hindwing with discal spot black ringed and white-centered, and larger than that of forewing; medial line blackish brown, curved outwards centrally; postmedial line, terminal line and fringes similar to those of forewing. Underside. Pale yellowish brown; transverse lines similar to those of upperside.

Male genitalia ( Fig. 11 ). Uncus in apical half broadened with two small processes on ventral side. Gnathos triangular, apically acute. Valva forming a small rounded process at apex; costa produced outwards; a short and digitiform process present on inner side of costa; sacculus with a stout and digitiform process near basal part. Saccus small. Aedeagus narrow and acute at apex, with a small spur subapically.

Female genitalia ( Fig. 19 ). Lamella postvaginalis almost triangular. Lamella antevaginalis narrow, plate-like, with dentate lateral margins. Ostium small and strongly sclerotized. Ductus bursae narrow and membranous, with a strongly sclerotized hood-like structure associated with ostium. Ductus seminalis usually arising from posterior part of ductus bursae. Corpus bursae long and bag-like, posterior part scattered with spurs on surface; signum oval, narrow centrally. Sternite 7 with a pair of wrinkled and rounded depressions on sides, weakly sclerotized and scabrous on surface.

Diagnosis. The discal spot of the hindwing is smaller than in O. carnearia and O. annulifera , and is less rounded than in O. deltaformis . In the male genitalia, O. annulifera and O. acutula have similar digitiform saccular processes. However, O. acutula differs from O. annulifera by the following characters: the gnathos is triangular in O. acutula , while it is digitiform in O. annulifera ; the apex of the valva forms a small rounded process in O. acutula , but is concave in O. annulifera . In the female genitalia, O. acutula and O. deltaformis have some similar characters: the lamella postvaginalis protrudes in the middle of the posterior margin; the lamella antevaginalis is broad and plate-like with dentate lateral margins. But, O. acutula differs from O. deltaformis by the following characters: the middle part of the posterior margin of the lamella postvaginalis is less protruding in O. acutula than in O. deltaformis ; the signum is smaller in O. acutula than in O. deltaformis .

Distribution. China (Gansu, Hunan, Sichuan).

Etymology. The species is named on the basis of the Latin word “ acutulus ”, which refers to the acute shape of the gnathos.

Figures

FIGURES 1–9. Male Adults of Organopoda. 1. O. carnearia (Walker, 1861), Tibet; 2. O. acutula sp. nov., holotype, Gansu; 3. O. annulifera (Butler, 1889), Sichuan; 4. O. deltaformis sp. nov., holotype, Hainan; 5–7. O. atrisparsaria Wehrli, 1924. 5. Sichuan; 6. Zhejiang; 7. Chongqing; 8. O. brevipalpis Prout, 1926, Sichuan; 9. O. megiste sp. nov., holotype, Sichuan. Scale bar=1 cm.

FIGURES 10–15. Male genitalia of Organopoda. 10. O. carnearia (Walker, 1861); 11. O. acutula sp. nov., paratype; 12. O. annulifera (Butler, 1889); 13. O. deltaformis sp. nov., holotype; 14. O. atrisparsaria Wehrli, 1924; 15. O. brevipalpis Prout, 1926. Scale bar = 1 mm.

FIGURES 18–23. Female genitalia of Organopoda. 18. O. carnearia (Walker, 1861); 19. O. acutula sp. nov., paratype; 20. O. deltaformis sp. nov., paratype; 21. O. atrisparsaria Wehrli, 1924; 22. O. brevipalpis Prout, 1926; 23. O. megiste sp. nov., paratype. Scale bar = 1 mm.