Genyocerus frontalis
Creators: name: Beaver, R. A.
name: L.-Y
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Curculionidae
Genyocerus
Genyocerus frontalis

description: <i>Genyocerus frontalis</i> (Strohmeyer) (Figs 11–14) <i>Diapus frontalis</i> Strohmeyer, 1914b: 5. <i>Diacavus frontalis</i> (Strohmeyer): Schedl, 1939: 364. <i>Genyocerus frontalis</i> (Strohmeyer): Wood, 1969: 118. <i>Diacavus haticollis</i> Browne, 1962: 217. <i>Diacavus laticollis</i> Browne, 1964: 753 (justified emendation). <b>n. syn.</b> Taxonomy: <i>Diapus frontalis</i> was described from a single male collected by G. Doria in Borneo (Sarawak) in 1865-66 and deposited in the Stettin Museum. Wood &amp; Bright (1992) state that the type is presumed lost; however, Wegrzynowicz &amp; Mokrycki (1996) list a 'syntype' in IZW. We have examined this specimen. There can be no doubt that it is the holotype of the species. It was evidently seen by Chapuis, who indicates on one of the eight labels below the specimen that it is a new species, but did not describe it. We have compared the holotype to a series of specimens from East Malaysia (Sabah) (ZMLU), which had earlier been compared to the holotype male of <i>Diacavus laticollis</i> Browne from West Malaysia (BMNH). Only a single species is represented. The previously unknown female is described below. Female: Generally resembling male, 3.7–3.8 mm long (excluding frontal hair brushes and part of abdomen extending beyond elytra), 2.9–3.0 times as long as wide. Frons with antennae inserted on upper part of frons close to upper margin of eyes, brushes of long, golden–yellow hairs present in young females both above epistoma and on upper part of frons (Figs 13–14), a large teardrop–shaped, shallow, shining, impunctate impression on each side, extending from vertex to lower quarter of frons, the impressions separated by a narrow, median carina, upper part of frons lateral to impressions flat, bearing on each side a large brush of hairs, extending dorsally well above antennal insertion and nearly meeting medially just below vertex, the majority of hairs directed forward, downcurved at tips, each brush extending ventrally in a narrow band close to inner margin of eye nearly to its lower margin, the lowest group of hairs longer and incurved towards midline; epistomal brushes divided into two parts on each side, the long hairs upcurved below those of the upper brushes, almost reaching vertex, lowest part of frons below impressions finely punctured, the punctures with much shorter erect hairs, normally concealed below epistomal brushes. Pronotum 1.05–1.1 times longer than wide, similar to that of male but with 9–12 large mycangial pores on each side of midline close to base (Fig. 13), rather than 0–2 as in male. Elytra wider than and about 1.6 times as long as pronotum, 1.5 times longer than wide, carina on base of elytra reduced and more rounded, striae less strongly impressed, becoming obsolete in posterior third of elytra, interstriae with sparse, semi–recumbent hairs, elytral apices lacking teeth, separately rounded, with more abundant short hairs. Female specimens examined: MALAYSIA: Sabah, Sipitang, Mendolong, 28.xi.1987, 6.v.1988, 13.v.1988 (S. Adebratt) (5 ♀) (ZMLU, RAB). Distribution: The species is recorded only from East Malaysia (Sarawak) and West Malaysia. It is newly recorded here from Brunei Darussalam and Sabah. New records: BRUNEI: 4 o 34'N, 115 o 7'E, Kuala Belalong FSC, Dipterocarp forest, site 1, 260m alt., Fog 8, 9.viii.1991 (N. Mawdsley) (1 ♂) (BMNH); Temburong, nr. K. Belalong Field Stud. Centre, 4 o 33'N, 115 o 09'E, 150m, 1.iii.1992 (R. A. Beaver) (3 ♂); as previous except: 200m, ex <i>Shorea</i> sp., 10.iii.1992 (2 ♂) (all RAB); [MALAYSIA (Sabah)] North Borneo (SE), Forest camp, 19 km. N. of Kalabakan, 60m., 13.x.1962 (Y. Hirashima) (1 ♂); as previous except: 21.x.1962 (1 ♂); as previous except: 19.x.1962 (K. J. Kuncheria) (1 ♂) (all BPBM); MALAYSIA: Sabah, Sipitang, Mendolong, 28.xi.1987, 6.v.1988, 13.v.1988 (S. Adebratt) (1 ♂, 5 ♀) (ZMLU, RAB). Biology: The only host record is from the dipterocarp tree <i>Shorea leprosula</i> (Browne 1962).
description: Published as part of <i>Beaver, R. A. &amp; L. - Y, 2007, A review of the genus Genyocerus Motschulsky (Coleoptera: Curculionidae: Platypodinae), with new synonyms and keys to species, pp. 25-56 in Zootaxa 1576 (1)</i> on pages 36-37, DOI: 10.11646/zootaxa.1576.1.3, http://zenodo.org/record/5096943
description: {"references": ["Strohmeyer, H. (1914 b) Neue Platypodiden des Stettiner Museums. Stettiner Entomologische Zeitung, 75, 1 - 8.", "Schedl, K. E. (1939) Malaysian Scolytidae and Platypodidae (IV). Journal of the Federated Malay States Museums, 18, 327 - 364.", "Wood, S. L. (1969) New synonymy and records of Platypodidae and Scolytidae (Coleoptera). Great Basin Naturalist, 29, 113 - 128.", "Browne, F. G. (1962) Some Scolytidae and Platypodidae (Coleoptera) from the Oriental region. Philippine Journal of Science, 89 (1960), 201 - 220.", "Browne, F. G. (1964) On some Platypodidae (Coleoptera) in the collection of the British Museum. Annals and Magazine of Natural History Series 13, 6 (1963), 753 - 760.", "Wood, S. L., &amp; Bright, D. E. (1992) A Catalog of Scolytidae and Platypodidae (Coleoptera), Part 2: Taxonomic Index, volume B. Great Basin Naturalist Memoirs, 13, 834 - 1553."]}