Ditrigona idaeoides (Hampson, 1893)

Guo, Xiao-Jiang, Cheng, Rui, Jiang, Shan, Xue, Da-Yong & Han, Hong-Xiang, 2022, Four new species of Ditrigona Moore (Lepidoptera, Drepanidae) in China and an annotated catalogue, ZooKeys 1091, pp. 57-98 : 57

14. Ditrigona idaeoides (Hampson, 1893)

Leucodrepana idaeoides Hampson, 1893: 333. Lectotype ♂, Sikkim: Tonglo (NHMUK).

Ditrigona idaeoides : Wilkinson, 1968: 447.

Material examined.

No

Distribution.

China (Sichuan), India.

Ditrigona triangularia species group

Based on Wilkinson (1968) and Jiang and Han (2019), the Ditrigona triangularia species group contains ten species, in which Ditrigona triangularia (Moore), Ditrigona regularis Warren, Ditrigona uniuncusa Chu & Wang, and Ditrigona tenuiata Jiang & Han bear elongate posterior projections of the hind wings (tail process); the other six species, Ditrigona titana Wilkinson, Ditrigona pomenaria ( Oberthür), Ditrigona typhodes Wilkinson, Ditrigona polyobotaria ( Oberthür), Ditrigona sciara Wilkinson, and Ditrigona fasciata (Hampson) lack the tail process. The first nine species are recorded in China, and three new species ( D. sinespina , D. parva , D. concava ) with the tail process are described in this work.

The species with a tail process on the hind wing have quite distinct wing patterns: the hind wing has the postmedial and submarginal lines approaching each other near the anal angle, and bears a small black patch at the upper angle of the tail. The species lacking a tail process resemble some species of the mytylata species group, in that they have transverse lines which often resemble a narrow band. In the male genitalia, the valva is characterized by having a small flap-like extension. The species with a tail process can also be distinguished by the large rounded socii and the stout aedeagus bearing a brush-like cornutus. In the species lacking a tail process, the aedeagus is narrow, straight or bent, and the cornutus is a simple process or absent. The eighth sternite is small, shallowly concave or protruding in species with a tail process, and the eighth tergite almost unmodified. Both eighth tergite and sternite often possess octavals in the species lacking a tail process. In the female genitalia, the ostium bursae is usually large, and the ductus bursae is often indiscernible, but wide and obvious in D. typhodes . The corpus bursae bears a small accessory sac in species with a tail process. (modified from Wilkinson, 1968)

16 DAN barcoding sequences were obtained for D. regularis , D. triangularia , D. tenuiata , D. concava sp. nov., D. parva sp. nov., and D. sinespina sp. nov., and the six species are clearly separated from each other in the COI barcode fragment (fig. 178). The genetic distance between these species is 8.92% (min. 7.16%, max. 12.32%).