A New Genus of Mimetic Longhorned Beetle from St. Lucia, Lesser Antilles (Coleoptera: Cerambycidae: Rhinotragini) Author(S): Steven W
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A New Genus of Mimetic Longhorned Beetle from St. Lucia, Lesser Antilles (Coleoptera: Cerambycidae: Rhinotragini) Author(s): Steven W. Lingafelter and Michael A. Ivie Source: Proceedings of the Entomological Society of Washington, 115(3):268-273. 2013. Published By: Entomological Society of Washington DOI: http://dx.doi.org/10.4289/0013-8797.115.3.268 URL: http://www.bioone.org/doi/full/10.4289/0013-8797.115.3.268 BioOne (www.bioone.org) is a nonprofit, online aggregation of core research in the biological, ecological, and environmental sciences. BioOne provides a sustainable online platform for over 170 journals and books published by nonprofit societies, associations, museums, institutions, and presses. Your use of this PDF, the BioOne Web site, and all posted and associated content indicates your acceptance of BioOne’s Terms of Use, available at www.bioone.org/page/ terms_of_use. Usage of BioOne content is strictly limited to personal, educational, and non-commercial use. Commercial inquiries or rights and permissions requests should be directed to the individual publisher as copyright holder. BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research. PROC. ENTOMOL. SOC. WASH. 115(3), 2013, pp. 268–273 A NEW GENUS OF MIMETIC LONGHORNED BEETLE FROM ST. LUCIA, LESSER ANTILLES (COLEOPTERA: CERAMBYCIDAE: RHINOTRAGINI) STEVEN W. LINGAFELTER AND MICHAEL A. IVIE (SL) Systematic Entomology Lab, ARS, USDA, National Museum of Natural History, MRC-168, P.O. Box 37012, Washington, DC 20013-7012, U.S.A. e-mail: [email protected]; (MI) Montana Entomology Collection – MSU, Montana State University, Marsh Labs, Room 50, 1901 S. 19th Ave., Bozeman, Montana 59717, U.S.A. Abstract.—A species originally described as Fortuneleptura romei Touroult, 2011 (Lepturinae) is placed in a new genus, Iyanola Lingafelter & Ivie (Cerambycinae: Rhinotragini). Along with the new genus description, the species is redescribed and additional collection data is recorded. A key to the genera and species of Rhinotragini (Cerambycidae: Cerambycinae) of the West Indies is presented. Key Words: Endemic, wood-borer, mimicry, taxonomy, identification DOI: 10.4289/0013-8797.115.3.268 We describe a new genus of St. Lucia one Batesian mimicry complex, one of Cerambycidae to accommodate the strik- whichwasdescribedbyDarlington ing mimetic species, Fortuneleptura romei (1938) and Lingafelter (2013). Includ- Touroult (2011). In Touroult’s work, that ing the species described herein, only 4 species was placed in the subfamily species (in 4 genera) of rhinotragines Lepturinae, but we provide morphologi- occur in the West Indies: Acyphoderes cal justification for its correct place- aurulenta (Kirby), Bromiades brachyptera ment in the Cerambycinae in the tribe (Chevrolat in Gue´rin-Me´neville), Odontocera Rhinotragini. The tribe Rhinotragini is a josemarti Zayas, and the new combina- primarily continental group with nearly tion, Iyanola romei (Touroult) (Monne´ 50 genera and 450 species known in the and Bezark 2013; Zayas 1975). This Western Hemisphere (Monne´ and Bezark is the Iyanola romei (Touroult) is the 2013), almost exclusively in the Neo- only rhinotragine known from the tropical Region, with only two species Lesser Antilles, the others being known reaching the extreme southern U.S. This only from the Greater Antilles. A key group has perhaps a greater degree of to all the genera and species of West diversified mimicry than any other group Indian Rhinotragini is presented. of insects (Linsley 1963). This species, along with other longhorned beetle spe- MATERIALS AND METHODS cies in the genera Calocosmus Chevrolat, Specimen depositories, curators, and Trichrous Chevrolat, and Pseudotho- acronyms are as follows: California State nalmus Guerrero, are members of at least Department of Food and Agriculture, VOLUME 115, NUMBER 3 269 Sacramento, California (S. Gaimari & Etymology.—The genus name, femi- A. Cline, CDFA); National Museum of nine in gender, is from a Carib name for Natural History, Smithsonian Institution, St. Lucia, “Iyanola” meaning “island of Washington, DC (S. Lingafelter, USNM); the iguanas.” West Indian Beetle Fauna Project, Type Species.—Iyanola romei (Tour- Bozeman, Montana (M. Ivie, WIBF). oult), by present designation. Label data is not verbatim, but rather summarized and standardized to avoid Iyanola romei (Touroult), redundancy and format inconsistency. new combination Fortuneleptura romei Touroult, 2011: 1 RESULTS AND DISCUSSION (Figs. 1–3) Iyanola Lingafelter & Ivie, new genus Description.—(based primarily on Iyanola Diagnosis.— shares with other females; only one male known): Mod- genera of Rhinotragini the following erate size, 6–10 mm long; 2.0–2.5 mm combination of characters: elongate wide at humeri; integument mostly pale frons, eyes finely faceted, anterior coxal yellow-orange with exception of var- cavities weakly angulate laterally, elytral iably developed black maculae on elytra epipleura weakly or incompletely devel- and pronotum, and antennomeres 2–11 oped, metepisternum large, subtriangular, (and sometimes part of scape and tarsi) much broader anteriorly than posteriorly, which are black. Elytra and pronotum and elytra attenuated with apices sepa- covered with dense, erect to suberect, rated (Linsley 1962). In addition, the hind golden pubescence. Golden setae shorter wing venation is reduced with the fol- but denser on pronotum compared to el- lowing veins absent or incomplete: MP3, ytra; moderately dense on head vertex MP4, CuA1, and CuA2 (terminology af- and venter. ter Lingafelter 1998). Head with shallow interantennal tu- Iyanola is easily distinguished from bercle region; tubercles weakly elevated. the other West Indian genera of Acyphoderes Audinet-Serville, Odontocera Audinet- Head moderately covered with golden Serville, and Bromiades Thomson by and translucent pubescence; not con- having fully developed elytra without spicuously punctate on vertex, sparsely epipleura. Acyphoderes and Odontocera punctate on frons. Frons and genae very each have subulate elytra with narrow elongate. Eyes finely faceted; lower lobe epipleura and widely diverging api- large, deeply notched by insertion of ces, exposing most of the hind wing. scape. Narrowest width at junction of Bromiades have incomplete, attenu- upper and lower lobes approximately ate elytra extending only to the basal 6–8 facets wide. Lower lobe about abdominal tergites and exposing most of equal in height to gena below it, over the hind wing and abdomen. 50 ommatidial facets in height. Lower Species of the small tribe Eroschemini eye lobes widely separated on frons. which includes only three species, one of Antenna 11-segmented, without spines; which occurs in the West Indies (Teth- with vestiture of short, appressed pu- limmena basalis Gahan, St. Vincent), are bescence and fringe of longer, golden superficially similar, but differ in having hairs along venter of basal antennomeres a short frons, elytral epipleura present, and 1–5. Antennomeres black with excep- antennomeres 3–10 strongly flattened. tion of mostly or entirely flavous scape. 270 PROCEEDINGS OF THE ENTOMOLOGICAL SOCIETY OF WASHINGTON Fig. 1. Iyanola romei (Touroult) (Cerambycidae: Rhinotragini). Digital painting adapted from fe- male specimen in USNM. Illustrated by Taina Litwak (SEL, USDA). VOLUME 115, NUMBER 3 271 Figs. 2–3. Iyanola romei (Touroult). 2, anterior view of head showing large, finely faceted eyes, and elongate frons and genae; 3, schematic drawings of elytra and pronotum showing variation in black maculae. Illustrated by Taina Litwak (SEL, USDA). Illustrated by Taina Litwak (SEL, USDA). 272 PROCEEDINGS OF THE ENTOMOLOGICAL SOCIETY OF WASHINGTON Antennomere 3 longest, 4 shortest; an- Lampyridae. All known specimens ex- tennomeres 5–10 successively decreas- cept one (briefly described in Touroult’s ing in length; 11 slightly longer than 10, original paper) are female, and there are tapering apically. Antennae reaching no notable morphological differences apical one-third to one-fourth of elytra. between the sexes. This species was orig- Pronotum about 1.25X wider than long; inally placed in the Lepturinae, in the widest as base, tapering anteriorly; with- genus Fortuneleptura Villiers, however it out lateral tubercles. Pronotum without possesses all the features typical of the distinct median callus, but with vaguely tribe Rhinotragini in the Cerambycinae. defined, broad, triangular region on disk Material examined.—7 female speci- containing a variably developed black mens (all from ST. LUCIA): Bordelais, macula. Entire pronotum covered with trap site 185 m, 13.9689°N, 60.8859°W, dense, golden, suberect pubescence; with- 19–25 JUNE 2009, malaise, C. A. Maier out distinct punctures. Prosternum im- & E. A. Ivie (1 USNM); Barre de l’Isle, punctate; sparsely pubescent. Prosternal 13.9326°N, 60.9577°W, 285 m, 18–30 process becoming very narrow between May 2009, canopy malaise, R. C. Winton, procoxae, then abruptly expanded be- L. L. Ivie, A. R. Cline, & S. D. Gaimari hind procoxae, closing them posteriorly. (1 USNM; 2 WIBF); Barre de l’Isle, Mesosternum short, impressed anteri- 13.9326°N, 60.9577°W, 285 m, 14 June orly to mesocoxae, with initially nar- 2009, C. A. Maier (1 WIBF); Barre row, then abruptly expanded, protruding de l’Isle, north side, 13.93268°N, process between mesocoxae, but with- 60.95775°W,