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A Review of Weevils of the Genus Ceutorhynchus (Coleoptera

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A Review of Weevils of the Genus Ceutorhynchus (Coleoptera ZOOSYSTEMATICA ROSSICA ISSN 2410-0226 Zoological Institute, Russian Academy of Sciences, St Petersburg ▪ https://www.zin.ru/journals/zsr/ [ onl ine] 0320-9180 Vol. 29(2): 353–367 ▪ Published online 25 December 2020 ▪ DOI 10.31610/zsr/2020.29.2.353 [ print] RESEARCH ARTICLE A review of weevils of the genus Ceutorhynchus (Coleoptera: Curculionidae), associated with woodland draba, Draba nemorosa (Brassicaceae) Обзор жуков-долгоносиков рода Ceutorhynchus (Coleoptera: Curculionidae), связанных с крупкой дубравной Draba nemorosa (Brassicaceae) B.A. Korotyaev Б.А. Коротяев Boris A. Korotyaev, Zoological Institute, Russian Academy of Sciences, 1 Universitetskaya Emb., St Petersburg 199034, Russia. E-mail: [email protected] Abstract. A brief review of, and a key to eight Palaearctic species of the weevil genus Ceutorhynchus Germar, 1823 associated with the spring and summer ephemeral crucifer Draba nemorosa (Brassicaceae) are given. Two new species related to Ceutorhynchus unguicularis C.G. Thomson, 1871 are described: C. kerzhneri sp. nov. from Primorskiy Territory and Kunashir I., and C. melniki sp. nov. from Zabaikalskiy and Primorskiy territories and eastern Mongolia. Резюме. Даны краткий обзор и определительная таблица восьми видов долгоносиков рода Ceu- torhynchus Germar, связанных с весенне-летним эфемером крупкой дубравной Draba nemorosa (Brassicaceae). Описаны два новых вида, близких к Ceutorhynchus unguicularis C.G. Thomson, 1871: C. kerzhneri sp. nov. из Приморского края и с о. Кунашир, и C. melniki sp. nov. из Забайкальского и Приморского краев и восточной Монголии. Key words: key to species, Russia, Transcaucasia, Siberia, Far East, Mongolia, Coleoptera, Curculion­ idae, Conoderinae, Ceutorhynchini, Ceutorhynchus, Draba nemorosa, new species Ключевые слова: определительная таблица, Россия, Закавказье, Сибирь, Дальний Восток, Монголия, Coleoptera, Curculionidae, Conoderinae, Ceutorhynchini, Ceutorhynchus, Draba nemorosa, новые виды ZooBank Arcicle LSID: urn:lsid:zoobank.org:pub:10BA4B22­F464­401E­BE99­619D53370A0C Introduction family Conoderinae and especially so in its largest genus Ceutorhynchus Germar, 1823, with over One of the characteristic features of weevils, 300 species associated almost exclusively with the especially of the species with larvae developing in plant family Brassicaceae (= Crucife rae) (Colon­ the plant tissues, is their pronounced preference for nelli, 2004), a group of plants rarely attacked by ruderal and coenophobic [term by Razumovskii poly phagous herbivores because of their richness (1981)] plants and pioneers of newly formed habi­ in toxic secondary compounds. In the course of the tats (Korotyaev, 1992, 2006). This feature is obvi­ study of relict westernmost communities of Ulmus ous in the supertribe Ceutorhynchitae of the sub­ japonica in southwestern Transbaikalia in 2018 © 2020 Zoological Institute RAS and the Author(s) B.A. Korotyaev. A review of Ceutorhynchus associated with woodland draba and 2019, only two specialised weevils were found angle about 45°). Body small, 1.6–1.9 mm (Figs on this important coenose­forming tree in the 1, 2). Ros t rum, antennae, and at least tibiae and flood­land forests, while on a delicate spring and tarsi reddish brown, pronotum and elytra black, summer ephemeral crucifer, the woodland draba, often with brownish tint. Dorsal vestiture moder­ Draba nemorosa, four Ceutorhynchus species were ately dense, uniform, subrecumbent to semi­erect, found (Korotyaev et al., 2020). A brief essay on for med by narrow parallel­sided whitish scales. Elytral striae bare, intervals not wider than striae, these and three additional species associated with flat or weakly convex. Hind wings non­functional, D. nemorosa in the West Sayan Mts and in Trans­ strongly redu ced. Aedeagus angularly narrowed caucasia was published (Korotyaev, 2019) but the apically (Figs 11, 12). identity of one of the species, C. sp. [? C. unguicu- 2 (3). Elytra narrow, 1.23–1.27 times as long as wide, laris C.G. Thomson, 1871], remains obscure. The slightly rounded at sides, flattened dorsally (Fig. 1). COVID­19 pandemic of 2020 has deterred inves­ Elytral vestiture subrecumbent. Aedeagus as in tigation of the woodland draba consortia, and only Figs 11, 19. Eastern Transcaucasia, Northeastern a single specimen of the problematic form collected Turkey .......................... C. gemuricus in Yakutia long ago is to be added to the known 3 (2). Elytra wider, oval, 1.08–1.15 times as long as distribution of the species of Ceuto rhynchus (Ko­ wide, noticeably rounded laterally and convex dor­ rotyaev, 2019). To facilitate further investigation sally (Figs 2). Elytral vestiture semi­erect. Aedea­ of the woodland draba consortia, a key to its eight gus as in Fig. 12, 20. Mountain Caucasus, middle Volga area, Kazakhstan, East Siberia: West Sayan known Ceutorhynchus species is given in this pa­ Mts, Buryatia ...................... C. kipchak per and descriptions of two very similar and, ap­ 4 (1). Antennal funicle seven­segmented. Claws sim­ parently, closely related species from the south of ple or toothed, free or closely approximate at base, Transbaikalia and the Russian Far East, and also thin or rather stout, weakly to moderately diver­ from eastern Mongolia, are published. Host plants gent. Body on overage larger, 1.5–2.5 mm. Body of these new species are not known, but may well predominantly black, only tibiae may be varying­ be in the genus Draba, so targeted collecting on ly dark brown; if legs, apical margin of pronotum Draba nemorosa and D. sibirica in those areas is and apex of elytra reddish brown, then body robust, most desirable. A key to the three species of the C. claws finely dentate, elytra with white scutellar spot unguicularis species group from Siberia and char­ and mottled vestiture of narrow white and brown­ acteristics of this group are also given. ish scales, and middle tibia of female finely mucro­ nate, anal ventrite deeply depressed medio­apically. Dorsal vestiture sparse to moderately dense, re­ Material and methods cumbent to semi­erect, uniform and formed by narrow parallel­sided or acuminate white scales, The length of body was measured from anteri­ or predominantly by semi­erect dark setae with an or margins of eyes to the apex of the elytra. admixture of white setiform scales. Elytral striae All material cited in the text is in the Zoologi­ bare or with white narrow scales, intervals usually cal Institute, Russian Academy of Sciences, St Pe­ wider than striae, flat or barely convex. Hind wings tersburg (ZIN). not conspicuously reduced. Aedeagus of varying structure. Taxonomic part 5 (8). Larger, 1.8–2.5 mm. Dorsal vestiture quite conspicuous, formed by recumbent uniform grey­ Order Coleoptera ish narrow truncate scales (then claws distinctly dentate, apical margin of 4th abdominal ventrite Family Curculionidae entire, and male fore tibia finely mucronate) or by Subfamily Conoderinae semi­erect dark setae with an admixture of white setiform scales (then claws simple, apical margin of Genus Ceutorhynchus Germar, 1823 4th abdominal ventrite shallowly excised medially A key to Ceutorhynchus species associated and slightly raised). Elytral striae with conspicu­ ous narrow white scales. Aedeagus angularly nar­ with Draba nemorosa rowing apically, with sides moderately sclerotised. 1 (4). Antennal funicle six­segmented. Claws sim­ 6 (7). Dorsal vestiture rather dense, formed by re­ ple, free, fine, short, moderately divergent (at an cumbent uniform greyish narrow truncate scales; 354 ( Zoosystematica Rossica, Vol. 29, No. 2, pp. 353–367 B.A. Korotyaev. A review of Ceutorhynchus associated with woodland draba Figs 1–4. Ceutorhynchus, dorsal habitus. 1, C. gemuricus, Azerbaijan, Autonomous Republic of Nakhchivan; 2, C. kipchak, Buryatia, Nikol’sk Vill.; 3, C. seniculus, Zabaikalskiy Terr., Zhindo Vill.; 4, C. klementzorum, Zabaikalskiy Terr., Zhindo Vill. Photo by K.V. Makarov. no trace of white stripes on pronotum or white scales; pronotum with narrow median and lateral scutellar spot present (Fig. 3); sides of mesothorax white stripes; elytra with ill­defined but conspicu­ without condensed white scales on apices of mes­ ous white scutellar spot (Fig. 4); sides of mesotho­ epimera. Claws distinctly dentate, apical margin of rax with white scales conspicuously condensed on 4th abdominal ventrite entire, male fore tibia finely apices of mesepimera. Claws simple; apical mar­ mucronate; aedeagus sharpened apically (Fig. 13). gin of male 4th abdominal ventrite shallowly ex­ East Siberia, Northeastern Russia (Magadan Prov., cised medially and slightly raised; male fore tibia Chukchi Autonomous Area), Mon golia, Northern non­mucronate; aedeagus narrowly rounded (Fig. China ............................ C. seniculus 14) or shallowly excised apically. Southern East Si­ 7 (6). Dorsal vestiture formed by subrecumbent to semi­ beria northward to Yakutia, eastern half of north­ erect dark and white very narrow parallel­sided ern Mongolia ................ C. klementzorum ( Zoosystematica Rossica, Vol. 29, No. 2, pp. 353–367 355 B.A. Korotyaev. A review of Ceutorhynchus associated with woodland draba Figs 5–8. Ceutorhynchus, dorsal habitus. 5, C. sp. [? C. unguicularis], Tuva; 6, C. querceti, Buryatia, Ina Vill.; 7, C. dauricus, Zabaikalskiy Terr., Zhindo Vill. (pygidium detached below); 8, C. cochleariae, Irkutsk. Photo by K.V. Makarov (5, 7, 8); photo by G.E. Davidian (6). 8 (5). Smaller, 1.5–2.4 mm. Dorsal vestiture fine, armed with clearly visible appendage in basal half. sparse
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