Ecologica Montenegrina 35: 123-128 (2020) This journal is available online at: www.biotaxa.org/em http://dx.doi.org/10.37828/em.2020.35.9

https://zoobank.org/urn:lsid:zoobank.org:pub:080E40CD-453A-426C-9395-9246BC75C3C8

Miltochrista bachma, a new species from southern Vietnam (, , )

ANTON V. VOLYNKIN1, 2, 4 & YEVGENIY A. DERZHINSKY3

1 Altai State University, Lenina Avenue, 61, RF-656049, Barnaul, Russia. E-mail: [email protected] 2 National Research Tomsk State University, Lenina Avenue, 36, RF-634050, Tomsk, Russia 3 Vitebsk State University named after P.M. Masherov, Moskovskiy Av., 33, Vitebsk 210038 Belarus. E-mail: [email protected] 4 Corresponding author

Received 30 September 2020 │ Accepted by V. Pešić: 19 October 2020 │ Published online 22 October 2020.

Abstract A new species of the Miltochrista Hübner, [1819], Miltochrista bachma Volynkin & Derzhinsky, sp. nov. is described from the Bạch Mã National Park in central Vietnam. The diagnostic comparison is made with Miltochrista testata (Černý, 2016) described from southern Vietnam and Miltochrista lyclenoides Černý, 2016 described from central Laos. Adults, male and female genitalia of the new and both similar species are illustrated.

Key words: Vietnam, Laos, new species, male genitalia, taxonomy.

Introduction

Miltochrista in its current treatment is one of the largest genera of lichen- (family Erebidae, subfamily Arctiinae, tribe , subtribe Nudariina). It belongs to the Asura / Miltochrista generic complex and is distributed widely in the Oriental and Palaearctic Regions. The basic checklist of the genus was recently provided by Volynkin et al. (2019), who included into the genus (in wide sense) 206 species and 10 subspecies. Four additional species were described a year later by Volynkin et al. (2020). However, the taxonomy of this large and diverse genus is still poorly studied and a number of new species is awaiting descriptions. During the examination of extensive unsorted Miltochrista materials collected in Vietnam and housed in MWM/ZSM collection the senior author found a series of unidentified species of Miltochrista similar to M. testata described recently from southern Vietnam. A series of additional specimens was collected in the same area (Bạch Mã National Park) by the second author. Females of the two species are very similar externally, but males of the newly discovered species have monotonous rose hindwing, whereas in M. testata that is blackish with the only red basal and anal areas. The male and female genitalia of the species from Central Vietnam are conspicuously different from those of M. testata and other known members of the genus as well, and the species is described below as new.

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MILTOCHRISTA BACHMA SP. NOV. FROM SOUTHERN VIETNAM

Material and methods

Abbreviations for collections used herein: CAV = private collection of Anton Volynkin (Leominster, UK); CKC = private collection of Karel Černý (Innsbruck, Austria); MWM/ZSM = Museum Witt in the Bavarian State Collection of Zoology (Museum Witt München / Zoologische Staatssammlung München, Munich, Germany). Other abbreviations used: HT = holotype; PT = paratype. The genitalia of specimens were dissected and mounted in Euparal on glass slides. Photos of imagoes were taken with a Nikon D3100/AF-S Nikkor, 18–55 mm camera. Photos of genitalia were taken with the same camera attached to a microscope with a LM-scope adapter. Adult and genitalia photos were all processed by Adobe Photoshop CC 2018 ® software.

Miltochrista bachma Volynkin & Derzhinsky, sp. nov. (Figs 1–3, 9, 10, 15) https://zoobank.org/urn:lsid:zoobank.org:act:F29932B8-689F-4E13-83C1-77270A33B10E

Type material. Holotype (Figs 1, 9): male, “S. [C] Vietnam, Bach-Ma Nat. Park 1200m, 16°10’N 107°54’E, 26.VII.–6.VIII.1996, leg. Sinjaev [Sinyaev] & Afonin, ex coll. A. Schintlmeister” / “Slide ZSM Arct. 2019-754♂ A. Volynkin” (Coll. MWM/ZSM).

Paratypes: 2 females with the same data as for the holotype, slide ZSM Arct. 2019-755 Volynkin (Coll. MWM/ZSM); 1 female, 3–7.IV.2014, Central Vietnam, Thừa Thiên-Huế Province, Annamite Mts, Bạch Mã National Park, 1400m, leg. local collector (Coll. CAV); 2 males, 2 females, 13.VIII.2019, Central Vietnam, Thừa Thiên-Huế Province, Annamite Mts, Bạch Mã National Park, 1250m, 16°11’34’’N 107°51’12’’E, edge of tropical forest, Ye.A. Derzhinsky leg., slides AV5887 and AV5888 (males) Volynkin (Coll. CAV).

Diagnosis. The new species (Figs 1–3) is similar to M. testata (Figs 4–6), but can be easily distinguished by its more shortly ciliate male antenna, slightly less elongate forewing apex, rose forewing coloration (in M. testata that is brick red in male and pale brick red in female), and pure rose male hindwing (in M. testata that is black with rose basal area and anal margin). The male genital capsule of the new species (Figs 9, 10) differs clearly from that of M. testata (Figs 11, 12) by the evenly narrow uncus (in M. testata that is broadened subapically), the more heavily setose subscaphium, the shorter juxta lacking a basal medial concavity (that is present in M. testata), the broader and more rectangular vinculum (in M. testata that is narrower and U-shaped), the valva of uniform width (in M. testata that is broadened distally), the costa being narrower apically and not protruding to the distal lobe of valva, the conspicuously narrower distal lobe of valva (‘cucullus’), the slightly broader sacculus, and the slightly more robust and elongate distal saccular process. The aedeagus of the new species is conspicuously shorter and narrower than that of M. testata. The vesica of M. bachma sp. nov. is conspicuously shorter and narrower than that of M. testata, has the broad and bilobate largest ventral diverticulum (in M. testata that is conical and strongly elongate), and the conspicuously smaller, hook-shaped distal cornutus (that is very large and straight in M. testata). The female genitalia of M. bachma sp. nov. (Fig. 15) differ from those of M. testata (Fig. 16) by the calyculate ostium bursae with a heavily sclerotized margins (whereas in M. testata there is a large rectangular antrum), the shorter and narrower membranous anterior section of the ductus bursae, the narrower corpus bursae bearing the elliptical signum (in M. testata that is round and slightly larger) and lacking a sclerotized lateral plate with spines and a sclerotized dentate posterior plate (both are present in M. testata), and the much shorter and narrower appendix bursae. The male genital capsule of the new species is also reminiscent of that of the recently described M. lyclenoides (Figs 7, 8, 13, 14), but differs by the juxta lacking a basal medial concavity, the valva being not broadened distally with the distal part of the costa not protruding to the distal lobe of valva. However, despite the similarity of the genital capsules, the male vesica structure and the female genitalia of the new species and M. lyclenoides are fundamentally different.

Description External morphology of adults (Figs 1–3). Forewing length 8.5–9 mm in males and 9.5–10 mm in females. Male antenna ciliate, female antenna filiform. Sexual dimorphism weakly expressed: female slightly larger than male only. Head rose with a black dot on frons. Thorax rose with four black dots. Abdomen brown with

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Figures 1–8. Miltochrista spp., adults. Depositories of the specimens: 1 and 3–6 in MWM/ZSM; 2 in CAV; 7 and 8 in CKC

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MILTOCHRISTA BACHMA SP. NOV. FROM SOUTHERN VIETNAM

Figures 9–12. Miltochrista spp., male genitalia. Depositories of the specimens: 9 and 11 in MWM/ZSM; 10 and 12 in CAV.

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Figures 13–16. Miltochrista spp., male (13) and female (14–16) genitalia. Depositories of the specimens: 13 and 14 in CKC; 15 and 16 in MWM/ZSM.

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MILTOCHRISTA BACHMA SP. NOV. FROM SOUTHERN VIETNAM admixture of rose scales. Forewing ground color rose, pattern black. Basal line represents two dots. Subbasal area with large subbasal dot and series of various sized short longitudinal strokes broadened distally. Subbasal part of costa edged with black. Antemedial line arcuate and W-like zigzagged medially. Medial line oblique, nearly straight. Postmedial line strongly loop-like curved around the cell and strongly regularly zigzagged on veins. Discal spot comma-like. Subterminal line parallel the postmedial line, strongly loop-like curved around the cell, interrupted into row of spots which are thin, stroke-like along the costa. Terminal line thin, entire. Cilia brown. Hindwing monotonous pale rose. Male genitalia (Figs 9, 10). Uncus narrow, evenly curved, apically pointed. Tuba analis moderately broad; scaphium very weakly sclerotized, thin; subscaphium represents broad setose area. Tegumen moderately short and narrow. Transtillae fused, moderately broad. Juxta short, trapezoid, moderately sclerotized. Vinculum robust, rectangular with rounded corners. Valva elongate, relatively narrow, with nearly parallel margins. Costa narrow, slightly convex subapically, without processes. Distal lobe of valva elongate, distally narrowed, rounded apically. Sacculus moderately broad, distal saccular process strongly elongate, narrow but robust, slightly curved dorsally, with pointed tip. Aedeagus elongate, nearly straight, with slightly broadened proximal end. Vesica short, membranous, with one small subbasal diverticulum; large, nearly sack-like bilobate largest diverticulum situated medio-ventrally with the smaller lobe being granulated; and short round granulated distal diverticulum bearing short hook-like cornutus on broad base. Distal plate of vesica short and moderately broad. Female genitalia (Fig. 15). Papilla analis broad, rectangular with rounded corners. Apophyses long and thin, equal in length. Ostium bursae moderately broad, its ventral margin edged with horseshoe-shaped sclerotized plate; dorsal part of subostial area of ductus bursae weakly granulated. Ductus bursae very short, narrow, membranous. Corpus bursae pear-shaped, membranous, with elliptical weakly dentate signum. Appendix bursae short, conical, membranous, situated posteriorly.

Distribution. The new species is known from its type locality, Bạch Mã National Park in central Vietnam only.

Etymology. The specific epithet refers to the type locality.

Acknowledgements The senior author expresses his sincere thanks to Dr Axel Hausmann, Dr Wolfgang Speidel and Mr Ulf Buchsbaum (ZSM, Munich, Germany) for their kind assistance during his work at the MWM/ZSM collection; and Dr Karel Černý (Innsbruck, Austria) for the access to his richest private collection provided. The second author is grateful to Mr Le Tuan Anh (Quang Ninh Province, Vietnam) and Ms Tran Thi Thuy (Thua Thien Hue Province, Vietnam) for their kind assistance during his field research in Vietnam.

References

Černý, K. (2016) A contribution to the knowledge of the Miltochrista-Lyclene genus group in South East Asia (Lepidoptera, Erebidae, Arctiinae, Lithosiini). Nachrichten des entomologischen Vereins Apollo, Neue Folge, 37 (2/3), 93–107. Volynkin, A.V., Huang, S.-Y. & Ivanova, M.S. (2019) An overview of genera and subgenera of the Asura / Miltochrista generic complex (Lepidoptera, Erebidae, Arctiinae). Part 1. Barsine Walker, 1854 sensu lato, Asura Walker, 1854 and related genera, with descriptions of twenty new genera, ten new subgenera and a check list of taxa of the Asura / Miltochrista generic complex. Ecologica Montenegrina, 26, 14–92. https://doi.org/10.37828/em.2019.26.3 Volynkin, A.V., Singh, N., Černý, K., Kirti, J.S. & Datta, H.S. (2020) Revision of the Miltochrista obliquilinea species-group, with descriptions of four new species (Lepidoptera, Erebidae, Arctiinae, Lithosiini). Zootaxa, 4780 (3), 448–470. https://doi.org/10.11646/zootaxa.4780.3.2

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