Ecologica Montenegrina 35: 138-143 (2020) This journal is available online at: www.biotaxa.org/em http://dx.doi.org/10.37828/em.2020.35.11

https://zoobank.org/urn:lsid:zoobank.org:pub:CA0F304E-E50D-4101-9E00-99FDC80A5347

Thamoma, a new for Miltochrista vetusta Piepers & Snellen, 1904 from Java (, , )

ANTON V. VOLYNKIN1, 2

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

Received 30 September 2020 │ Accepted by V. Pešić: 21 October 2020 │ Published online 23 October 2020.

Abstract The new genus Thamoma Volynkin, gen. nov. is erected for Miltochrista vetusta Piepers & Snellen, 1904 from Java. The new genus is closely related to the genera Cyme Felder, 1861 and Ammatho Walker, 1855, but differs from them by the complex of characters in male and female genitalia.

Key words: Java, new genus, male genitalia, taxonomy.

Introduction

The / Miltochrista generic complex is one of the largest and most taxonomically difficult groups within the tribe . Volynkin et al. (2019) partially revised the generic structure of the complex and provided the preliminary check list of taxa of the group. However, many taxa of the complex still have unclear generic placement and many species groups need revision. Miltochrista vetusta Piepers & Snellen, 1904 was provisionally left under the genus Miltochrista by Volynkin et al. (2019) until the type material of the taxon is examined. During my work at RMNS collection I examined and dissected syntypes of this peculiar species. It is externally different from other relatives and its male genitalia are conspicuously different from those of Miltochrista and more similar to those of the genera Cyme Felder, 1861 and Ammatho Walker, 1855. However, the genitalia of Miltochrista vetusta have fundamental differences from both Cyme and Ammatho which suggests that the species belongs to another, yet undescribed genus. The genus is erected below as new.

Material and methods

Abbreviations for collections used herein: 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); NHMUK (formerly BMNH) = Natural History Museum (London, UK); RMNH = Naturalis Biodiversity Center (Leiden, the Netherlands). Other abbreviations used: HT = holotype; LT = lectotype; PLT = paralectotype; PT = paratype; ST = syntype.

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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. Imago and genitalia photos were all processed by Adobe Photoshop CC 2018 ® software.

Genus Thamoma Volynkin, gen. nov. https://zoobank.org/urn:lsid:zoobank.org:act:4F825941-7F77-4C9B-86FC-DC89B972A910 Type species: Miltochrista vetusta Piepers & Snellen, 1904.

Etymology. The new genus name is an anagram of the genus-group name Ammatho.

Diagnosis. The new genus is closely related to the genera Cyme and Ammatho s. str. Adults of the new genus (Figs 1, 2) are characterized by their relatively large size and brown wing coloration. The forewing pattern resembles that of some species of Cyme. However, externally, the new genus can be easily separated from Cyme (Figs 3–6) and Ammatho (Figs 7, 8) by the serrate male antenna (that is ciliate in Cyme and Ammatho) and the area of dense hair-like scales on the tip of female abdomen (such a structure is absent in Cyme and Ammatho, but present in some groups of Miltochrista). The male genitalia of Thamoma gen. nov. (Fig. 9) are characterized by the combination of the following diagnostic characters: (1) the tuba analis is membranous (that bears a broad setose subscaphium in Cyme (Figs 10–12) and Ammatho (Fig. 13)); (2) the juxta is trapezoid, evenly weakly sclerotized (whereas in Cyme and Ammatho that bears two heavily sclerotized plate-like crests fused apically); (3) the costa protrudes beyond the medial costal process but lacks a distal process (whereas in Cyme the costa does not protrude beyond the medial costal process, and in Ammatho a well-developed distal process is present); (4) the distal ventral process of valva is broadly bilobate: its ventral lobe is short, broadly trigonal and directed distally, while the ventral lobe is elongate and narrow, directed distally-dorsally and originates from nearly medial part of the junction of the distal ventral process of valva and the clasper (an autapomorphic character); (5) the aedeagus is short in comparison with the genital capsule (whereas in Cyme and Ammatho the aedeagus is conspicuously more elongate); (6) the vesica consists of several diverticula bearing clusters of trigonal short but robust cornuti (similar to Cyme and Ammatho), but lacks a basal plate of vesica ejaculatorius (that is present in both Cyme and Ammatho). The female genitalia of the new genus (Figs 14) are characterized by the combination of the following diagnostic characters: (1) the antrum is short, nearly rectangular, weakly sclerotized (whereas in Cyme (Fig. 15) the antrum is not developed, and in Ammatho (Fig. 16) that is strongly elongate with parallel margins and occupies more than three thirds of the length of ductus bursae); (2) the corpus bursae is membranous (whereas in Cyme that is thick-walled and rugose medially, and in Ammatho that is densely spinulose scobinated); (3) the appendix bursae is broadly conical, weakly sclerotized and rugose, directed posteriorly (whereas in Cyme that is narrowly conical, heavily sclerotized and directed latero-posteriorly, and in Ammatho that is broad, sack-like, densely spinulose setose and directed anteriorly or latero-anteriorly).

Description. External morphology of adults (Figs 1, 2). Forewing length 13–13.5 mm in males and 15.5– 16.5 mm in females. Male antenna serrate, female antenna weakly ciliate. Female has slightly narrower, more elongate forewing and more reduced forewing pattern than male. Body brown. Forewing ground color brown. Pattern dark brown. Subbasal dot present. Antemedial and medial lines angled in the cell, broadened at costa and diffuse posteriorly. Postmedial line angled in the cell, broad at costa and its posterior part represents a series of trigonal spots connected to each other by strong brown suffusion. Subterminal line represents elongate spot at costa and interrupted into series of trigonal spots medially and posteriorly. Terminal line interrupted into series of various sized spots between veins. Discal spot relatively small, shortly reniform. Cilia monotonous brown. Hindwing pale brown, slightly darkened outwardly and along the veins. Male genitalia (Fig. 9). Uncus narrow, elongate, curved subbasally, slightly broadened subapically, pointed apically. Tuba analis membranous. Tegumen short but broad. Juxta trapezoidal, weakly sclerotized. Vinculum moderately long, narrowly U-shaped. Valva broadened medially and slight narrowed distally. Costa narrow, with moderately long and curved medial process; distal part of costa thin, without processes. Distal lobe of valva broad, rectangular, with rounded corners. Clasper broadened distally, fused with distal ventral process. Sacculus narrow, fused with distal ventral process. Distal ventral process of valva broad, bilobate, its ventral lobe short, broadly trigonal with blunt tip, directed distally, while ventral lobe elongate

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Figures 1–8. Lithosiini spp.: adults of type species of the genera. 5 – type species of the genus-group name Miltasura Roepke, 1946 (synonym of Cyme); 6 – type species of the genus-group name Pallene Walker, 1854 (synonym of Cyme). Depositories of the specimens: 1, 2 and 5 in RMNH; 3 in MWM/ZSM; 4 and 6 in NHMUK (©); 7 and 8 in CKC.

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Figures 9–12. Lithosiini spp.: male genitalia of type species of the genera. 11 – type species of the genus-group name Miltasura (synonym of Cyme); 12 – type species of the genus-group name Pallene (synonym of Cyme). Depositories of the specimens: 9 and 11 in RMNH; 10 and 12 in NHMUK (©).

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Figures 13–16. Lithosiini spp.: male (13) and female (14–16) genitalia of type species of the genera. Depositories of the specimens: 13 and 16 in CKC; 14 in RMNH; 15 in NHMUK (©).

and narrow, directed distally-dorsally and originates from nearly medial part of the junction of distal ventral process of valva and clasper. Aedeagus relatively short, broadened distally. Vesica medially broadened, curved dorsally, with cluster of short trigonal cornuti basally, and two distal diverticula bearing clusters of various sized short but robust trigonal cornuti. Basal plate of vesica ejaculatorius absent. Female genitalia (Fig. 14). Papilla analis broadly trapezoid with rounded corners. Apophyses long and thin, apophyses

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VOLYNKIN anteriores slightly longer than apophyses posteriores. Antrum short, nearly rectangular with convex lateral margins, moderately sclerotized. Ductus bursae short, dorso-ventrally flattened, its left margin more heavily sclerotized than right one. Corpus bursae nearly elliptical, its posterior end thick-walled, slightly rugose. Anterior section of corpus bursae membranous. Appendix bursae broadly conical, weakly sclerotized and rugose, situated postero-ventrally, directed posteriorly.

Distribution. The genus is endemic for Java Island.

Species composition. The genus is monotypic.

Thamoma vetusta (Piepers & Snellen, 1904), comb. nov. (Figs 1, 2, 9, 14)

Type material examined. Lectotype (designated herein) (Figs 1, 9): male, “Java occ., Preanger, 1800m, 1887.3 ♂” / “orig. desalb” / blue label “TYPE” / “Museum Leiden M. vetusta Det.: Sn.” / red label “SYNTYPE vetusta Snellen” / “Cat. № 1” / QR-code label with unique number “RMNH.INS 1148699”, genital slide RMNH.INS 1148699 Volynkin (Coll. RMNH).

Paralectotypes: 1 female, “Java occ., Berg Gedeh, 4000 ft., 1887 ♀” / “Museum Leiden M. vetusta Det.: Sn.” / “Cat. № 6” / QR-code label with unique numbers “RMNH.INS 1148700”, genital slide RMNH.INS 1148700 Volynkin; 1 female, same data, “Cat. № 8”; 1 female, “Java occ., Preanger, 1800m, 1887.3 ♀” / “Museum Leiden M. vetusta Det.: Sn.” / “Cat. № 2”; 1 female, “Java occ., Preanger, 15–1800m, 1885 ♀” / “Museum Leiden M. vetusta Det.: Sn.” / “Cat. № 3”; 1 male, “Java occ., Preanger, 1886” / “Museum Leiden M. vetusta Det.: Sn.” / “Cat. № 4”; 1 male, “W Java, Preanger, 5000 vt., 1894 ♀ / “Museum Leiden M. vetusta Det.: Sn.” / “Cat. № 5”; 1 female, “Java occ., Gedeh, 1400m, 1887.3” / “Museum Leiden M. vetusta Det.: Sn.” / “Cat. № 7” (Coll. RMNH).

Additional material examined. 1 male, W Java, Preanger, 5000 vt., 1894 (Coll. RMNH).

Diagnosis. See the diagnosis for the genus.

Distribution. The species is known from western Java Island only (Piepers & Snellen 1904).

Acknowledgements I express my sincere thanks to the following colleagues for their kind assistance provided during his studies at their institutions: Dr Rob de Vos (RMNS, Leiden, the Netherlands); Dr Alberto Zilli and Mr Geoff Martin (NHMUK, London, UK); Dr Axel Hausmann, Dr Wolfgang Speidel and Mr Ulf Buchsbaum (ZSM, Munich, Germany). I also indebted to Dr Karel Černý (Innsbruck, Austria) for the access to his richest private collection provided.

References

Piepers, M.C. & Snellen, P.C.T. (1904) Énumeration des Lépidoptères Hétérocères de Java. Tijdschrift voor entomologie, 47, 136–167. [in French] 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

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