Thysanoplisna, Volynkin, 2023

Volynkin, Anton V., 2023, On the taxonomy of the genus Thysanoptyx Hampson with descriptions of two new genera and a new species from Vietnam (Lepidoptera: Erebidae: Arctiinae: Lithosiini), Ecologica Montenegrina 69, pp. 54-63 : 55

Genus Thysanoplisna gen. n.

https://zoobank.org/ urn:lsid:zoobank.org:act:F9033E59-37E0-4636-AAF8-0BD7421BC9D7

Type species: Lithosia brevimacula Alphéraky, 1897 , by present designation.

Diagnosis. Species of the new genus ( Figs 1–4 ) are clearly different from other groups previously included in Thysanoptyx ( Figs 5–8 ) due to their broader forewing with a darker, ochreous-brown or grey ground colour (it is pale yellow in Collitoptyx gen. n. and Thysanoptyx ), and a short medial patch, which is strongly elongate in Collitoptyx gen. n. and Thysanoptyx . The similar forewing shape and markings are known in certain species of the genus Teulisna Walker, 1862 ( Figs 11, 12 ), including its type species. However, the male genitalia of Thysanoplisna gen. n. ( Figs 13–15 ) are fundamentally different from Teulisna ( Fig. 19 ) in the structure of the vinculum, distal saccular process, and phallus, while the female genitalia of the new genus ( Fig. 20 ) can easily be distinguished from Teulisna ( Fig. 24 ) by the narrow antrum opening at the posterior margin of the 7 th abdominal sternite (it is dilated, rugose and opening in the middle of the 7 th sternite in Teulisna ), and the posterior section of the corpus bursae bearing a large gelatinous protrusion, whereas in Teulisna it is narrow, membranous and rugose. The male genitalia structure of Thysanoplisna gen. n. ( Figs 13–15 ) is also fundamentally different from Thysanoptyx ( Fig. 17 ) and is very close to the externally dissimilar Indalia (illustrated by Dubatolov & Zolotuhin (2011, as Manulea , partim.) and Macià et al. (2022)), and the only distinctive feature differing Thysanoplisna gen. n. from this genus is the uncus structure, which is weakly sclerotised and dorso-ventrally flattened in the new genus and heavily sclerotised and cylindrical in cross section in Indalia . The main differences between the new genus and Indalia are found in the female copulatory organ structure. Compared to Indalia , the female genitalia of Thysanoplisna gen. n. have a corpus bursae clearly subdivided into the anterior and posterior sections with the latter one bearing a large gelatinous protrusion, whereas the corpus bursae of Indalia is sack-like.

Distribution. Species of the genus are known from mainland China and northern Indochina.

Etymology. The generic name is an aggregate of the genus-group names Thysanoptyx and Teulisna . Gender is feminine.

Remarks. The new genus comprises the species included by Volynkin & Dubatolov (2017) in the ‘ Thysanoptyx brevimacula species-group’. The genus is currently under revision by Volynkin et al. (in prep.).

Figures

Figures 1–8. Lithosiina spp.: adults. Depositories of the specimens: 1, 3–8 in MWM/ZSM; 2 in NHMUK (©The Trustees of NHMUK).

Figures 9–12. Lithosiina spp., type species of the genera: adults. Depositories of the specimens: 9 in ANHRT; 10 in ZFMK (photo by S.-Y. Huang); 11 and 12 in MWM/ZSM.

Figures 13–16. Lithosiina spp.: male genitalia. Depositories of the specimens dissected: 13–15 in MWM/ZSM; 16 in NHMUK (©The Trustees of NHMUK).

Figures 17–19. Lithosiina spp.: male genitalia of the type species of the genera. Depositories of the specimens dissected: 17 in NHMUK (©The Trustees of NHMUK); 18 in ANHRT; 19 in MWM/ZSM.

Figures 20–24. Lithosiina spp.: female genitalia of the type species of the genera. Depositories of the specimens dissected: 20–22 in NHMUK (©The Trustees of NHMUK); 23 in ANHRT; 24 in MWM/ZSM.