Review of the Genus Metipocregyes Breuning, 1939 with Two New Combinations and Three New Species (Coleoptera, Cerambycidae, Lamiinae, Mesosini)
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Zootaxa 4532 (4): 503–522 ISSN 1175-5326 (print edition) https://www.mapress.com/j/zt/ Article ZOOTAXA Copyright © 2018 Magnolia Press ISSN 1175-5334 (online edition) https://doi.org/10.11646/zootaxa.4532.4.3 http://zoobank.org/urn:lsid:zoobank.org:pub:FEA9DAAC-4E25-459B-A31B-B73794F2EF22 Review of the genus Metipocregyes Breuning, 1939 with two new combinations and three new species (Coleoptera, Cerambycidae, Lamiinae, Mesosini) JUNSUKE YAMASAKO1,3 & MEI-YING LIN2 1Division of Informatics and Inventory, Institute for Agro-Environmental Sciences, NARO, 3–1–3 Kannondai, Tsukuba, Ibaraki, 305– 8604 Japan 2Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 1–5 Beichen West Road, Chaoyang, Beijing 100101, China. 3Correspondence author. E-mail: [email protected] Abstract The genus Metipocregyes Breuning, 1939 is reviewed. Hypocacia fruhstorferi Breuning, 1959 and H. wenhsini Yamasako & Chou, 2013 are transferred to Metipocregyes. Three new species of Metipocregyes are described; M. brunneatus sp. nov. from Vietnam, M. holzschuhi sp. nov. from Laos, and M. variabilis sp. nov. from China. With these taxonomic acts, Metipocregyes is comprised of seven species and an identification key for them is presented. The habitus, male genitalia, and name-bearing types of all species in this study are figured. Key words: Coleoptera, Cerambycidae, Lamiinae, Mesosini, Taxonomy, Oriental region Introduction Metipocregyes Breuning, 1939 is a small genus of the tribe Mesosini Mulsant, 1839 (Coleoptera, Cerambycidae, Lamiinae). It was established by Breuning (1939) based on a single species, Mesosa nodieri Pic, 1933 from Vietnam. Subsequently, two species from Laos, M. rondoni Breuning, 1965 and M. affinis Breuning, 1968, were added to the genus (Breuning 1965, 1968). Of those members, M. rondoni was recently transferred to the genus Anipocregyes Breuning, 1939 by Yamasako & Makihara (2017) with a replacement name, A. albifrons Yamasako & Makihara, 2017. Prior to this study, the genus was comprised of only two species from Vietnam and Laos, and the original generic concept had never been reviewed since its establishment by Breuning (1939). The work of Yamasako & Makihara (2017), however, necessitated a review of the genus Metipocregyes, and in the course of the studies on Mesosini, taxonomic confusion was recognized between Metipocregyes and the genus Hypocacia Breuning, 1935. Our study on the genus also resulted in discovery of three unknown species from China, Laos, and Vietnam. After close examination, we concluded that they were congeneric with Metipocregyes although some features did not match the original definition of the genus. Herein, we review Metipocregyes and partly expand its definition to resolve taxonomic confusion and describe three new species from China, Laos, and Vietnam. Material and methods This study was based on dried specimens preserved in the following institutions and private collections: Bernice P. Bishop Museum, Honolulu, USA (BPBM); Ehime University Museum, Matsuyama, Japan (EUMJ); Forschungsinstitut und Naturmuseum Senckenberg, Frankfurt-am-Main, Germany (SMF); Institute of Zoology, Chinese Academy of Sciences, Beijing, China (IZAS); Muséum national d'Histoire naturelle, Paris, France (MNHN); Museum für Naturkunde, Berlin, Germany (MNHUB); National Museum of Natural Science, Taichung, Taiwan (NMNS); Osaka Museum of Natural History, Osaka, Japan (OMNH); Forestry and Forest Products Accepted by G. Nearns: 28 Nov. 2018; published: 20 Dec. 2018 503 Research Institute, Tsukuba, Japan (FFPRI); National Museum of Natural History (Smithsonian Institution), Washington, DC, USA (NMNH); and private collections of Xavier Gouverneur, Rennes, France (CXG); Carolus Holzschuh, Villach, Austria (CCH); Bin Liu, Bin Insect Taxonomy Studio, Beijing, China (BITS); Tatsuya Niisato, Tokyo, Japan (CTN); Tomáš Tichý, Ostrava, Czech Republic (CTT); Shigeo Tsuyuki, Zushi, Japan (CST); and the first author, Tsukuba, Japan (CJY). Verbatim label data are provided for the name-bearing types, of which data on each label are cited in double quotation marks (“ ”) with a slash (/) indicating the line break. The observational method, terminology, and abbreviations of the endophallus mainly follow Yamasako & Ohbayashi (2011), but petroleum jelly was used to inflate endophalli in this work. The abbreviations used in the present paper for endophallus are as follows: APH: apical phallomere; BPH: basal phallomere; CS: crescent shaped sclerites; CT: central trunk; ED: ejaculatory duct; LSp: large spicules; MPH: median phallomere; MSp: micro spicules; MT: medial tube; PB: pre-apical bulb; and SSp: small spicules. [The term “phallomer” was proposed for endophallic subdivision of Cerambycidae by Danilevsky et al. (2005), and has been followed by subsequent authors (Kasatkin, 2006; Yamasako & Ohbayashi, 2011; etc.), but it might be misspelling of “phallomere”. We therefore modified the term here.] Measurements of various body parts are coded as follows: LB = length of body, from the tip of vertex to elytral apex; LE = length of elytra, from the basal margin to the apex along suture; LG = length of gena, from the upper margin to the lower margin; LL = length of lower eye lobe, from the upper margin to the lower margin; LP = length of pronotum, from the basal to the apical margin along the suture; WB = maximum width across body; WEH = width across elytral humeri; WL = width of lower eye lobe near middle; WP = maximum width across pronotum. The number of measured specimens is shown in parentheses at the beginning of the description for each sex. Systematics Genus Metipocregyes Breuning, 1939 Metipocregyes Breuning, 1939: 429. Type species. Mesosa nodieri Pic, 1933 Redescription. Body 10.1–19.0 mm, moderate in size or relatively small among the genera of Mesosini. Eye subdivided into upper and lower lobes connected posteriorly by narrow line with/without single row of ommatidia, or deeply emarginate and the lobes connected posteriorly by 2–4 rows of ommatidia; lower lobe large, prominent, somewhat vertically long. Antennal tubercle gently elevated. Antenna moderately thick, fringed with suberect hairs beneath antennomeres, gradually sparser and shorter toward apical segment; antennomere I thick and short, subequal to or slightly shorter than antennomeres III and IV respectively, gently thickened apically, with cicatrix on apex of outer side; antennomere III slightly longer than IV. Pronotum transverse, gently swollen laterally, with/ without rudimentary projection anterolaterally, with pair of indistinct swellings on disk, weakly constricted and transversally depressed near base and apex. Prosternal process with slightly ridged lateral margins, rounded in lateral view. Mesosternal process with ridged lateral margins forming pair of small projections near apex, nearly truncate in lateral view. Elytron with long suberect hairs throughout, somewhat projected anteriorly beside scutellum, slightly raised longitudinally behind base; humerus subquadrate and slightly expanded laterally; apical margin arcuate with sub-quadrate inner angles. Mesotibia simple, without distal notch at outer margin. Male genitalia with tegmen wide in dorsal view; paramere somewhat thick. Endophallus 2.5–4.0 times as long as median lobe, subdivided into BPH, MPH (delimited into MT+CT and PB), and APH, but APH almost fused and swollen together with distal part of PB. MPH with MT+CT long, about twice length of median lobe, bent at distal half, with MSp and LSp; PB elongate, cylindrical, with SSp. APH undeveloped, with single ED usually on dorsal side, sometimes with rudimental AA on distal part. MSp indistinct, mainly distributed in proximal 2/3 of MT+CT; LSp uni-dentate, small, distributed in distal 1/5–1/3 of MT+CT; SSp unidentate, minute, covered most area of PB and proximal area of APH. Remarks. The genus Metipocregyes had been defined mainly by the following features since its establishment (modified Breuning, 1939): Body elongate. Eye subdivided; lower lobe slightly longer than wide. Antennal 504 · Zootaxa 4532 (4) © 2018 Magnolia Press YAMASAKO & LIN tubercle slightly elevated. Antenna robust, scarcely longer than body, fringed with long hairs; antennomere I long, with developed cicatrix; antennomere III distinctly longer than I and IV. Pronotum transverse, with slightly distinct transverse furrow. Elytra long, rounded apically, roundly projected forward at middle of each base. Prosternal process weakly projected below, rounded in lateral view. Mesosternal process with tubercle at middle, truncate at anterior margin. Legs short and thick; mesotibia without distal notch. Metipocregyes nodieri (Pic, 1933) (Figs 1–4, 29–30, 43–44, 53–60) Mesosa nodieri Pic, 1933: 14. Metipocregyes nodieri: Breuning, 1939: 429. Type locality. Dong Van, Ha Giang Prov., Vietnam. Type material examined. Syntype: ♀ (MNHN, Figs 43–44), “D’. Nodir / Dong-Van”, “Longic. / 68”, “Type”, “Mesosa / nodieri / n sp”. Other materials examined. 1♀ (CJY, Figs 3–4, 30), Mt. Tam Dao, Vinh Phu Prov., Vietnam, 5–10. VI, 1995, T. Kurihara coll.; 1♂ (CTN), same locality but 26. V, 1999, H. Karube leg.; 1♂ (IZAS, Figs 1–4, 29, 53–60), Huayudong, Hekou, Yunnan Prov., China, 4. IV, 2010, Yang Xiaodong leg., IOZ(E)1906090, B10Y0069; 1♀ (BITS), Dayao-shan (Mt.), Pingban Tun, Daojiang Village, Changdong Township, Jinxiu County, Laibin City, Guangxi Prov., China, 24°6'12.92"N/110°11'00.65"E, Alt. 1,223 m, 16. VI. 2015, Jinteng Zhao coll.; 1♂1♀ (BITS), Dayao-shan (Mt.), Pingzhao