Ecologica Montenegrina 19: 102-109 (2018) This journal is available online at: www.biotaxa.org/em

https://zoobank.org/urn:lsid:zoobank.org:pub:41E9BB8A-A7CB-4839-86A5-D495A07C8BD8

On the taxonomy of the Eugoa Walker, 1858, with descriptions of two new species from Laos and Vietnam (, , , )

ANTON V. VOLYNKIN1,2,6, KAROL BUCSEK3, KAREL ČERNÝ4 & AIDAS SALDAITIS5

1 Altai State University, Lenina str. 61, RF-656049, Barnaul, Russia. E-mails: [email protected], [email protected] 2 Tomsk State University, Institute of Biology, Ecology, Soil Science, Agriculture and Forestry, Lenina Avenue, 36, RF- 634050, Tomsk, Russia 3 Slovak Academy of Sciences, Institute of Zoology, Dúbravská cesta 9, Bratislava 845 06 Slovak Republic. E-mail: [email protected] 4 Tiergartenstrasse 27, A-6020 Innsbruck, Austria. E-mail: [email protected] 5 Nature Research Centre, Akademijos str., 2, LT-08412, Vilnius-21, Lithuania. E-mail: [email protected] 6 Corresponding author

Received 10 October 2018 │ Accepted by V. Pešić: 19 November 2018 │ Published online 20 November 2018.

Abstract Two new species of the genus Eugoa Walker, 1858, Eugoa dubatolovi Volynkin, Bucsek & Černý, sp. nov. (South Laos and South Vietnam) and Eugoa sinxayi Volynkin, Bucsek & Černý, sp. nov. (Central Laos) are described. Both new species are related to Eugoa zolotuhini Dubatolov & Bucsek, 2016 and Eugoa hainanensis Fang, 2000. Adults and male genitalia of the new and related species are illustrated.

Key words: Lithosiini, Asia, Laos, Vietnam, new species.

Introduction

The genus Eugoa Walker, 1858 belongs to the Eugoa group of genera including also the genera Notata Hampson, 1891, Holocraspedon Hampson, 1893, Meteugoa Hampson, 1900, Malesia van Eecke, 1920, Planovalvata Dubatolov & Kishida, 2012, Neoeugoa Singh & Kirti, 2016, Philenora Rosenstock, 1885, Katmeteugoa van Eecke, 1920, Cyclosiella Hampson, 1900, and Trischalis Hampson, 1894 (Holloway, 2001; Kirti & Singh, 2016). Eugoa is one of the largest genera of Lithosiini and includes about 120 species. The check list of the genus was recently published by Bucsek (2016a). Many species of Eugoa were described during last two decades (Fang, 2000; Holloway, 2001; Bucsek, 2008; 2012; 2016b; Černý and Pinratana, 2009; Dubatolov & Bucsek, 2013; 2016; Černý and Bucsek, 2014; Kirti and Singh, 2016). Species of the genus are distributed mostly in Oriental and south of Palaearctic regions, six species are also known from Africa (Kühne, 2007), but their generic placement is unclear and needs revision. During studies of Lithosiini materials from Laos and Vietnam, we found two more, yet undescribed species of Eugoa. The descriptions of the new species are presented below.

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Material and Methods

The genitalia were dissected and mounted in euparal on glass slides. Photos of imago where taken using the camera Nikon D3100/AF-S Nikkor, 18-55 mm. Genitalia images were taken by the same camera attached to a microscope with an LM-scope adapter. Abbreviations used: AV = genitalia slides prepared by Anton Volynkin; CAV = private collection of Anton V. Volynkin (Barnaul, Russia); CKB = private collection of Karol Bucsek (Bratislava, Slovakia); CKC = private collection of Karel Černý (Innsbruck, Austria); HT = holotype; NHMUK (formerly BMNH) = Natural History Museum (London, UK); MWM/ZSM = Museum Witt Munich / The Bavarian State Collection of Zoology (Museum Witt München / Zoologische Staatssammlung München, Munich, Germany); PT = paratype; SZMN = Siberian Zoological Museum of the Institute of Systematics and Ecology of , Siberian Branch of RAS (Novosibirsk, Russia).

Taxonomic account

Eugoa dubatolovi Volynkin, Bucsek & Černý, sp. nov. (Figs 1–3, 7–9)

Type material examined. Holotype (Figs 1, 7): male, “03–16.VIII.2016, South Laos, Champasak prov., 27 km ENE of Pakse, near Tad Fane waterfall, N15°11‟01.1‟‟ E106°07‟40.5‟‟, 950 m, border of primary forest, A.V. Volynkin & M.S. Ivanova leg.”, slide AV3112m (Coll. NHMUK).

Paratypes: 1 male, X.2015, South Vietnam, Lam Dong province, Lac Duong district, Tay Nguyen Highlands, Nui Ba National Park, leg. Vo Van Nhon, slide AV3105m (Coll. CAV); 1 male, S Vietnam, Da Lat, Datan La, 1380 m, 11°54‟10.6‟‟N 108°26‟0.59‟‟E, 29.IX.2013, leg. K. Černý, slide AV4098m (Coll. CKC).

Diagnosis. Eugoa dubatolovi sp. nov. is a closest relative of E. sinxayi sp. nov., E. zolotuhini and E. hainanensis. Externally, the new species (Figs 1–3) can be easily distinguished from E. zolotuhini (Fig. 5) by its larger size, darker forewing ground color, much broader antemedial line of forewing interrupted into two broad dark spots, posteriorly broader postmedial line, and well developed subterminal line; from E. hainanensis (Fig. 6) it differs by the larger size and much broader antemedial line of forewing interrupted into two broad dark spots. The male genitalia of E. dubatolovi sp. nov. (Figs 7–9) differ from those of E. zolotuhini (Fig. 11) by the uncus much broader basally and medially, broader penicular lobes, much longer juxta, much larger, trigonal dorsal lobe of sacculus with less setose dorsal margin (whereas in E. zolotuhini the dorsal lobe of sacculus is much narrower, finger-like, heavily setose), broader apex of valva, larger subapical ventral process of valva, broader subbasal ventral diverticulum, absence of medial dorsal diverticulum, much smaller and slightly C-like curved apical diverticulum, and presence of a row of 3–5 short cornuti in the medial section of vesica (whereas in E. zolotuhini the subbasal ventral diverticulum is narrower, the medial dorsal diverticulum is present, the apical diverticulum is much larger, S-like curved, and there are only two short cornuti in the medial section of vesica); from those of E. hainanensis (Fig. 12) the male genitalia of E. dubatolovi sp. nov. differ by the basally narrower and dorso-ventrally flattened uncus, narrower penicular lobes, dorsally curved distal section за valva, much larger, trigonal dorsal lobe of sacculus, much larger, round apex of valva, much smaller, trigonal subapical ventral process of valva, smaller subbasal ventral diverticulum, absence of medial dorsal diverticulum, much smaller and slightly C- like curved apical diverticulum, and presence of a row of 3–5 short cornuti in the medial section of vesica, whereas in E. hainanensis the basal section of uncus is broader and inflated, the penicular lobes are broader, the distal section of valva is straight, the dorsal lobe of sacculus is smaller, rounded, the apex of valva is small, thorn-like, the subapical ventral process of valva is large, rounded, the subbasal ventral diverticulum is much broader, the medial dorsal diverticulum is present, the apical diverticulum is much larger, S-like curved, and there are only two small cornuti in the medial section of vesica. The differences between E. dubatolovi sp. nov. and E. sinxayi sp. nov. are listed in the diagnosis of the latter.

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Figures 1–8. Eugoa spp.: adults. 1, E. dubatolovi, holotype male, S Laos (NHMUK); 2, E. dubatolovi, paratype male, S Vietnam (CKC); 3, E. dubatolovi, paratype male, S Vietnam (CAV); 4, E. sinxayi, holotype male, C Laos (MWM/ZSM); 5, E. zolotuhini, holotype male, N Vietnam (SZMN); 6, E. hainanensis, male, S Laos (CAV).

Description. Adult (Figs 1–3). Forewing length 10.5–12 mm. Male antennae bipectinate. Head and thorax dark brown; tegula with large blackish spot; abdomen ochreous brown. Ground color of forewing pale grayish brown, with strong dark brown suffusion. Pattern blackish brown. Basal line interrupted into broad costal spot and short and thin medial stroke; antemedial line broad, interrupted into two large spots; postmedial line S-like curved, strongly broadened at costa and anal margin; subterminal line thin, diffuse, broken; two blackish dots in cell; cilia pale brown, with row of blackish brown dots between veins. Hindwing pale brown with grayish suffusion; cilia pale brown. Male genitalia (Figs 7–9). Uncus spearhead- like, dorso-ventrally flattened; tuba analis membranous, scaphium narrow, weakly sclerotized, subscaphium weakly setose; tegumen short, penicular lobes medium-broad, rounded; juxta large, trapezoidal, with small apical medial concavity; vinculum very short, U-like. Valva elongated, distally slightly narrowed and dorsally curved; broad row of strong hair-like setae in medial area of valva; apex of valva heavily

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Female unknown.

Distribution. The species is known from South Laos and South Vietnam.

Etymology. The species‟ name is dedicated to Dr. Vladimir V. Dubatolov (Novosibirsk, Russia), a famous expert in the Arctiinae taxonomy.

Eugoa sinxayi Volynkin, Bucsek & Černý, sp. nov. (Figs 4, 10)

Type material examined. Holotype (Figs 4, 10): male, “Nam Phao, 620 m, Bolikhamxai prov., Laos. Date: August 9, 2010. Collect: Kenichiro Nakao, No. 100809232”, slide slide AV4097m (Coll. MWM/ZSM).

Diagnosis. Eugoa sinxayi sp. nov. is a sister species of E. dubatolovi sp. nov. Externally the two species are very similar (Figs 1–4), only pattern elements of E. sinxayi sp. nov. seem to be slightly paler, brown. The main differences between these species can be found in the male genitalia structures: in E. sinxayi sp. nov. (Fig. 10) the uncus is narrower basally than that of E. dubatolovi sp. nov. (Figs 7–9), the penicular lobes are shorter, with more smoothly curved margins, the juxta is longer, the basal lobe of sacculus distally narrower and rounded, the apex of valva is slightly longer, apically dentate, the subbasal lateral diverticulum is much broader, the medial lateral diverticulum is broader and weaker granulated, the medial ventral diverticulum is much longer, the apical diverticulum is narrower.

Description. Adult (Fig. 4). Forewing length 12 mm. Male antennae bipectinate. Head and thorax dark brown; tegula with large blackish spot; abdomen ochreous brown. Ground color of forewing pale grayish brown, with strong dark brown suffusion. Pattern dark brown. Two diffuse blackish dots in cell; basal line interrupted into broad costal spot and thin, trigonal medial stroke; antemedial line as two large spots; postmedial line S-like curved, strongly broadened at costa and anal margin; subterminal line thin, diffuse, broken; terminal line as row of dots between veins; cilia pale brown, with row of dark dots between veins. Hindwing pale brown with grayish suffusion; cilia pale brown. Male genitalia (Fig. 10). Uncus spearhead- like, dorso-ventrally flattened; scaphium narrow, weakly sclerotized, subscaphium weakly setose; tegumen short, penicular lobes medium-broad, smoothly rounded; juxta large, trapezoidal, apically elongated, with small apical medial concavity; vinculum very short, U-like. Valva elongated, distally slightly narrowed and dorsally curved; broad row of strong hair-like setae in medial area of valva; apex of valva heavily sclerotized, broad, apically dentate; subapical ventral process of valva trigonal, directed ventrally; sacculus broad, its basal lobe large, broad, apically rounded, setose, extends beyond costal margin. Aedeagus medium-long, proximally broadened, slightly curved distally; vesica broad, membranous, with membranous, broad and round subbasal ventral diverticulum, granulated, long, broadly conical medial ventral diverticulum, granulated, round medial lateral diverticulum, and membranous, finger-like apical diverticulum; row of five thorn-like cornuti of different size medio-laterally; vesica ejaculatorius directed dorsally.

Female unknown.

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Figures 7–10. Eugoa spp.: male genitalia. 7, E. dubatolovi, holotype, S Laos, slide AV3112m; 8, E. dubatolovi, paratype, S Vietnam, slide AV3105m; 9, E. dubatolovi, paratype, S Vietnam, slide AV4098m; 10, E. sinxayi, holotype, C Laos, slide AV4098m.

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Distribution. The species is known only from Central Laos.

Etymology. „Sinxay‟ is a hero, a character of the Lao epic poem „Sang Sinxay‟.

Eugoa zolotuhini Dubatolov & Bucsek, 2016 (Figs 5, 11)

Eugoa zolotuhini Dubatolov & Bucsek, 2016, Euroasian entomological journal 15 (3): 234, Figs 14, 33 (Type locality: “North Vietnam, Thanh Hoa Prov., Thuong Xuan Distr., Xuan Lien NR [National Reserve], anthropog.[enic landscape], 19°52' N, 105°14.28' E, 130 m”).

Type material examined. Holotype (Figs 5, 11): male, “29–30.XI.2012, N. Vietnam, Thanh Hoa Prov., Thuong Xuan Distr., Xuan Lien NR, anthropog., 19°52‟N 105°14.28‟E, 130 m, V. Zolotuhin leg.” / “Eugoa sp. n. V.V. Dubatolov det. IV.2013”, slide AV4313m (Coll. SZMN). Paratypes: 1 male, 1 female, same data as in the holotype (Coll. SZMN).

Distribution. North Vietnam (Dubatolov and Bucsek, 2016).

Figures 11–12. Eugoa spp.: male genitalia. 11, E. zolotuhini, holotype, N Vietnam, slide AV4313m, ex prep. Dubatolov; 12, E. hainanensis, S Laos, slide AV3113m.

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Eugoa hainanensis Fang, 2000 (Figs 6, 12)

Eugoa hainanensis Fang, 2000, Fauna Sinica. Insecta 19: 63, 536, text fig. 37, pl. I, fig. 20 (Type locality: “Hainan Jianfengling”). = Eugoa simonae Bucsek, 2008, Entomofauna 29 (26): 427, figs 15, 16, 75, 76 (Type locality: “Cambodia, Kirirom Nat. Park, 780 m, N11°21‟23”, E104°4‟38”).

Type material examined. Holotype: male, “Cambodia, Kirirom Nat.Park, 780 m, N 11º21‟23‟‟, E 104º4‟38‟‟, 2.–17.I.2000, leg. M. & S. Murzin (Coll. MWM/ZSM). Paratypes: 1 female, same data as in the holotype (Coll. MWM/ZSM); 1 male, S India, Tamil Nadu, Kalkao Wildlife Sanctuary, Manimtar-Kodear, 1300 m, 8°19‟N, 77°26‟E, 8.IV.1997, leg. Sinjaev & Schintlmeister (Coll. MWM/ZSM); 1 male, Nepal, Mechi, Taplejung area, Tamur valley, 4 km N Dobhan, 800 m, 87°40‟E, 27°22‟N, 22.X.1996, leg. Gy. M. László & G. Ronkay (Coll. MWM/ZSM); 1 male, N Thailand, Mae Hong Son, 10 km E Khun Yuam, 950 m, N18º47‟10‟‟, E98º3‟4‟‟, forest border, 1.V.2006, leg. Karel Černý (Coll. CKB); 1 female, Thailand, Mt. Doi Phahompok, 14 km NW of Fang, 1700 m, 16.X.2000, leg. local collector (Coll. MWM/ZSM); 1 female, SW Thailand, Chumphon prov., Pa Toh distr., Ban Lang Tang, 162 m, N9º46.5‟, E98º46.59‟, 21.XI.2006, leg. Karel Černý (Coll. CKB).

Other material examined: 3 males, 03–16.VIII.2016, South Laos, Champasak prov., 27 km ENE of Pakse, near Tad Fane waterfall, N15°11'01.1'' E106°07'40.5'', 950 m, border of primary forest, A.V. Volynkin & M.S. Ivanova leg., slides AV3106m, AV3113m, AV3115m (Coll. CAV).

Distribution. The species is widespread in India, Nepal, SE China (Hainan Isl.), Thailand, Cambodia (Fang, 2000; Bucsek, 2008, Černý and Pinratana, 2009) and Laos.

Acknowledgements We thank Dr. Vladimir V. Dubatolov (SZMN, Novosibirsk) for his help during the senior author‟s work at SZMN collection; Dr. Thomas J. Witt (MWM, Munich, Germany), Dr. Wolfgang Speidel (Olching, Germany), Dr. Axel Hausmann (ZSM, Munich, Germany) and Mr. Ulf Buchsbaum (ZSM, Munich, Germany) for their kind assistance during our work at MWM/ZSM collection.

References

Bucsek, K. (2008) Contribution to the knowledge of the genus Eugoa Walker, 1858 (Lepidoptera: Arctiidae, Lithosiinae). Entomofauna, 29 (26), 417–468. Bucsek, K. (2012) Erebidae, Arctiinae (Lithosiini, Arctiini) of Malaya Peninsula-Malaysia. Institute of Zoology SAS, Bratislava, 170 pp. Bucsek, K. (2016a) List and systematic classification of species of the genus Eugoa Walker, 1858, (Lepidoptera: Erebidae, Arctiinae, Lithosiini). Entomofauna, 37 (22), 365–388. Bucsek, K. (2016b) Several species of genus Eugoa Walker, 1858 (Arctiinae, Lithosiini) from Indonesia and India. Entomofauna carpathica, 2016, 28 (2), 6–-84. Černý, K. & Bucsek, K. (2014) Review of the Eugoa˗group in the family Erebidae (Lepidoptera: Erebidae, Arctiinae, Lithosiini) from the Philippines. Entomofauna, 35 (22), 461–524. Černy, K. & Pinratana, A. (2009) of Thailand, Vol. 6, Arctiidae. Brothers of Saint Gabriel in Thailand, Bangkok, Thailand, 283 pp. Dubatolov, V.V. & Bucsek, K. (2013) New species of lichen˗moths from South˗East Asia (Lepidoptera, , Lithosiini). Tinea, 22 (4), 279–291. Dubatolov, V.V. & Bucsek, K. (2016) New lichen˗ taxa (Lepidoptera, Arctiidae, Lithosiinae) from Vietnam. Euroasian entomological journal, 15 (3), 228–238. Fang, C. (2000) Lepidoptera. Arctiidae. Fauna Sinica (Insecta) 19. Science Press, Beijing, 590 pp. (In Chinese).

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Holloway, J.D. (2001) The Moths of Borneo, part 7. Family Arctiidae, subfamily Lithosiinae. Malayan Nature Journal, 55, 279–486. Kirti, J.S. & Singh, N. (2016) Arctiid moths of India, 2. Nature Books India, New Delhi, 214 pp. Kühne, L. (2007) Beschreibung neuer Flechtenbärenarten aus Afrika nebst taxonomischen Anmerkungen (Arctiidae: Lithosiinae). Esperiana Memoir, 3, 353–394. [In German]

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