Description of a New Species from the Genus Eugoa Walker, 1858 (Lepidoptera: Erebidae: Arctiinae) from the Solomon Islands

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Description of a new species from the genus Eugoa Walker, 1858 (Lepidoptera: Erebidae: Arctiinae) from the Solomon Islands

Article in Zootaxa · August 2018 DOI: 10.11646/zootaxa.4504.1.8

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The user has requested enhancement of the downloaded file. Zootaxa 4504 (1): 135–137 ISSN 1175-5326 (print edition) http://www.mapress.com/j/zt/ Correspondence ZOOTAXA Copyright © 2018 Magnolia Press ISSN 1175-5334 (online edition) https://doi.org/10.11646/zootaxa.4504.1.8 http://zoobank.org/urn:lsid:zoobank.org:pub:D188728E-BC65-48E3-88FF-AE91164D2C8D

Description of a new species from the genus Eugoa Walker, 1858 (Lepidoptera: Erebidae: Arctiinae) from the Solomon Islands

KAROL BUCSEK1 & MICHAL RINDOŠ2, 3 ¹Slovak Academy of Sciences, Institute of Zoology, Dúbravská cesta 9, SK-845 06 Bratislava Slovak Republic. E-mail: [email protected] ²Biology Centre of the Czech Academy of Sciences, Institute of Entomology, CZ-37005 České Budějovice, Czech Republic. E-mail: [email protected] 3Faculty of Science, University of South Bohemia, CZ-37005 České Budějovice, Czech Republic.

The genus Eugoa Walker, 1858 belongs to the tribe Lithosiini and occurs across the Old World, excluding the Western Palearctic Region. Currently, it contains around 120 species, most of them distributed across Asia (Bucsek 2016a, b; Dubatolov & Bucsek 2016; Schaus 1922). Ten additional species have been described from Australasia (Bethune-Baker 1904; Rothschild 1915). Since the 19th century, several authors have addressed the taxonomy of the genus Eugoa (Buscek 2008, 2012, 2016a, b; Černý & Bucsek 2014; Hampson 1891, 1898, 1900; Rothschild 1915; Seitz 1914; Van Eecke 1930), but only a few described their habitat preferences (e.g. Holloway 2001). These small to medium sized moths with brown, or brown—cream coloured forewings inhabit a wide range of forest types (e.g. alluvial, dipterocarp, heath, kerangas, etc.) from mangroves and lowland-coastal forests (about 300m asl) up to upper montane forests (about 1500 m asl). Unfortunately, life history data for species in the genus Eugoa still remain unavailable. Here, we present a new species from Guadalcanal Island recovered by M. Rindoš during a study of the Lepidoptera collection of NMPC. One male specimen was caught at light at the edge of the upper parts of a secondary lowland forest and a clearing on a hill (Fig. 1). Photos of adults were made on a Leica DFC 450 camera (Leica Planapo 0.5x WD 187 mm objective). Morphological observations of genitalia were done using a microscopic glass and Canada balsam on a Leica M205FA and photographed with an additional Canon EOS 60D camera. Subsequently genitalia were demounted and stored in a tube with glycerine under the studied specimen. Later, post-shooting photo corrections were made in Adobe Photoshop CS6. Institutional abbreviations are as follows:

NMPC—National Museum, Prague, Czech Republic MWM—Museum Witt, Munich, Germany BMNH—British Museum of Natural History, London, United Kingdom BC—Biology Centre, v.v.i., Czech Academy of Sciences, České Budějovice, Czech Republic

Eugoa salomonica Bucsek & Rindoš, sp. nov. (Figs. 2, 3, 5) Diagnosis. As to the nearest relative of the new species, based on the morphology of the genitalia, we can consider Eugoa silvia Bucsek, 2016 (Fig. 4) from Halmahera Island, Moluccas, Indonesia. Eugoa salomonica, sp. nov. differs from E. silvia by having a slightly smaller body size, different pattern in the discal area of the forewings, where the newly described species has a dark brown subreniform spot instead of the straight strip connecting the postbasal and postdiscal stripes. Also the postdiscal stripe is without a notch on the outer margin. The male genitalia of E. silvia differs by the shape of the valve lacking an evident tip on the end and marginal serration (Fig. 6). The juxta is without a sclerotized top with spines. The phallus is smaller and less curved and the basal diverticulum has a longer and sharper tip. Type material. Holotype, male, Solomon Islands, Guadalcanal, ca. 3,5 km SE of Barana village, (clearing in secondary forest, at light), 09° 29.8' S, 159° 59.5' E, 190 m, 24. xi. - 14. xii.2013, leg. Jiří Hájek, the holotype is deposited in NMPC.

Accepted by P. Goldstein: 13 Aug. 2018; published: 23 Oct. 2018 135 FIGURE 1. Type locality of Eugoa salomonica sp. nov.—Guadalcanal, Solomon Islands; 2: Eugoa salomonica sp. nov.—Paratype, male specimen from collection of MWM; 3: Eugoa salomonica sp. nov.—Holotype, male, and associated locality label; 4: Eugoa silvia—Holotype, male, Halmahera Isl., Indonesia; 5: Eugoa salomonica sp. nov.— Holotype, male genitalia; 6: Eugoa silvia—Holotype, male genitalia.

136 · Zootaxa 4504 (1) © 2018 Magnolia Press BUCSEK & RINDOŠ Paratype, male, Solomon Islands, Prov. Guadalcanal Isl., 6 km S Honiara, 2 km S Mbarana village, 360 m, 1.- 3.ii. 1998, ex coll. Dr. R. Brechlin, the paratype is deposited in collections of MWM, genitalia slide no. 33.359. Description. Wingspan: male imago 24.0 mm. Body length: male imago 8.5 mm (measured from frons to the last abdominal segment). Head: cream, antennae dark brown with a shorter pectination, frons yellowish, labial palpae dark brown with cream last segment. Thorax: Patagium of prothorax and tegula partially dark brown, thorax cream. Forewing length of a male imago 10 mm (measured from base to the apex of a left forewing), background of forewings beige with three dark brown longitudinal stripes. Dark brown spots on the base and on outer margin of basal area, dark brown subreniform spot in discal area. Postbasal and postdiscal stripes with asymmetrical sinuous margins, terminal stripe dark brown with two spikes protruding into the subterminal area and ochre cilia on the outer margin. Hindwings pale yellow- brown with a dark greyish dusting covering almost half of terminal area and with higher concentration in its apical part. Abdomen: pale yellow-brown. Male genitalia: Uncus robust with notable hair, extended in the upper part and terminate with thin hooked spine (Fig. 5). Tegumen long glabrous tapering upwards. Valve wide with hairy cucullus, as is usual in the genus Eugoa (Bucsek 2008), process of cucullus narrow with serrated outer margin and spiky tip. Medial part of costa with sclerotized extension into a costal process; saccular margin smooth and rounded. Gnathos with evident cornutus; juxta sclerotized on both sides of the top and densely covered with spines. Phallus hooked with smooth and bulbous phallobase. Aedeagus wide, with evident sclerotized basal diverticulum forming a wide tip ended with spikes and granular apical diverticulum. Ventral carinal band sclerotized, curved and ended with sclerotized cornut with shape of crown. Female morphology remains unknown. Etymology. The new species was named after the type locality, the Solomon Islands.

Acknowledgements We would like to thank to Jan Šumpich (NMPC, Czech Republic) and Thomas Witt (MWM, Germany) for giving us an access to the museum collections and to Chris Raper (BMNH, United Kingdom) and Aleš Bezděk (BC, Czech Republic) for their comments and language corrections.

References Bethune-Baker, G.T. (1904) New Lepidoptera from British New Guinea. Novitates Zoologicae, 11, 367–429. 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 Malay 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, 28 (2), 69–84. 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. Dubatolov, V.V. & Bucsek, K. (2016) New lichen-moth taxa (Lepidoptera, Arctiidae, Lithosiinae) from Vietnam. Euroasian Entomological Journal, 15 (3), 228–238. Eecke, van R. (1930) De Heterocera van Sumatra. Eerste deel. E. J. Brill, Leiden, 456 pp. Hampson, G.F. (1891) Illustrations of typical specimens of Lepidoptera Heterocera in the collection of the British Museum. Part 8. The Lepidoptera Heterocera of the Nilgiri District. British Museum of Natural History, London, 144 pp. Hampson, G.F. (1898) The moths of India. Supplementary paper to the volumes in „The fauna of British India“. Part II. Journal of the Bombay Natural History Society, 11, 438–462. Hampson, G.F. (1900) Catalogue of the Lepidoptera Phalaenae in the British Museum, Vol. 2. Catalogue of the Arctiadae (Nolinae, Lithosianae) in the collection of the British Museum. British Museum of Natural History, London, 589 pp. Holloway, J.D. (2001) The Moths of Borneo. Vol. 7. Southdene Sdn. Bhd., Kuala Lumpur, 207 pp. Rothschild, W. (1915) Lepidoptera of the British Ornithologists' Union and Wollaston Expeditions in the Snow Mountains, Southern Dutch New Guinea. Hazell, Watson and Viney LD., London, 182 pp. Schaus, W. (1922) New species of Lithosiidae from the Oriental Region (Lepidoptera). Insecutor Inscitiae Menstruus, 10 (1–3), 23– 37. Seitz, A. & Draudt, M. (1914) Arctiidae: Lithosiinae. In: Seitz, A. (Eds.), The Macrolepidoptera of the World. Vol. 10. The Indo- Australian Bombyces and Sphinges. Alfred Kernen Verlag, Stuttgart, pp. 118–223.

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