Three new species of the genus Nudina Staudinger, 1887 from northern Indochina (Lepidoptera: Erebidae: Arctiinae: Lithosiini) Author Volynkin, Anton V. Altai State University, Lenina Av. 61, RF- 656049, Barnaul, Russia. Author Huang, Si-Yao 0000-0002-9859-9212 Department of Entomology, College of Plant Protection, South China Agricultural University, Guangzhou 510642, Guangdong, China. huangsiyao 2007 @ aliyun. com; https: // orcid. org / 0000 - 0002 - 9859 - 9212 huangsiyao2007@aliyun.com Author Spitsyna, Elizaveta A. 0000-0002-4616-0988 N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences, Northern Dvina Emb. 23, 163000, Arkhangelsk, Russia. & https: // orcid. org / 0000 - 0002 - 4616 - 0988 Author Bolotov, Ivan N. 0000-0002-3878-4192 N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences, Northern Dvina Emb. 23, 163000, Arkhangelsk, Russia. & http: // orcid. org / 0000 - 0002 - 3878 - 4192 Author Spitsyn, Vitaly M. 0000-0003-2955-3795 N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences, Northern Dvina Emb. 23, 163000, Arkhangelsk, Russia. & https: // orcid. org / 0000 - 0003 - 2955 - 3795 text Zootaxa 2021 2021-05-17 4970 3 547 557 journal article 6255 10.11646/zootaxa.4970.3.6 5d123380-5ada-4704-8913-244b25263eee 1175-5326 4766858 DC7E7FC9-D326-4E6C-A462-EBCBCE8359EA The ankistro species-group Diagnosis . Imagoes of the species-group differ from those of the artaxidia species-group by the longer lamellae of antennae of males and the shortly bipectinate female antennae (in the artaxidia species-group, the female antennae are serrate). The male genital capsule differs from that of the artaxidia species-group by the wide and heavily sclerotized transtilla, the robust harpe, and the unilobate ventro-distal process of valva. The aedeagus of the ankistro species-group has markedly larger distal carinal processes armed with clusters of tiny denticles, whereas in the artaxidia species-group, the carinal processes are markedly smaller and have smooth surface. The vesica of the ankistro species-group is much broader basally and longer than in the artaxidia species-group. The female genitalia of the ankistro species-group are characterized by the narrower antevaginal plate, the ductus bursae bearing an elongate ventral large sclerotized plate protruding to the posterior section of the corpus bursae and the large, broadbased appendix bursae curved distally and directed anteriorly.