Organopoda acutula Cui & Xue & Jiang 2019, sp. nov.
Creators: name: Cui, Le
name: Xue, Dayong
name: Jiang, Nan
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Geometridae
Organopoda
Organopoda acutula

description: 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.
description: Published as part of Cui, Le, Xue, Dayong & Jiang, Nan, 2019, A review of Organopoda Hampson, 1893 (Lepidoptera, Geometridae) from China with description of three new species, pp. 434-444 in Zootaxa 4651 (3) on pages 436-437, DOI: 10.11646/zootaxa.4651.3.2, http://zenodo.org/record/3363341