Xenorthrius bornensis Gerstmeier & Eberle, 2010

Gerstmeier, Roland & Eberle, Jonas, 2010, Revision of the Indo-Australian checkered beetle genus Xenorthrius Gorham, 1892 (Coleoptera: Cleridae, Clerinae) 2584, Zootaxa 2584 (1), pp. 1-121 : 24-26

Xenorthrius bornensis Gerstmeier & Eberle, 2010 n. sp.

( Figures 17 and 63F )

Specimens examined: Holotype: Malaysia, Borneo: Sabah, Crocker Range, Gunung Alab , 1350m, 1.– 2.12.2006, R. Grimm (♂, RGCM).

Paratypes: Malaysia: Borneo: Sabah; Kinabalu National Park, Headquarters area , el. 1560m, 5 Aug. 1983, G.F. Hevel & W.E. Steiner ( NMNH) . Borneo : Sabah, Mt. Kinabalu N.P. Summit Trail, 2050m IV-26-87; Beating foliage, D.E. Bright, collector ( NMNH) . Borneo 15- 27.4.1993, Sabah Crocker Mt., Gunung Emas env., Jenis & Strba leg. ( BMNH) . Malaysia, Sabah, local collector; Crocker Range III/ IV-2009 ( RGCM) ; Sipitang III-8-2009 ( RGCM) ; Mt. Trus-Madi III-14-2009 (2 ex., DHCH, 1 ex., RGCM) .

Measurements: (9 specimens measured) Average total length: 8.2mm, range: 7.1–8.8mm, average elytral length: 5.6mm, average elytral width: 2.3mm, average pronotal length: 2.0mm, average pronotal width: 1.7mm, average head width: 1.7mm.

Head: Dark red-brown; cranium vested with longer and shorter setae, with distinct punctation, interstices at least one diameter of punctures; posterior part of clypeus dark red-brown, margins darkened, with large punctation and a few long setae laterally, smooth centrally; ventral part red-brown and smooth, except wrinkles behind the eyes; antennae dark red-brown, antennomeres gradually decreasing in length from A3 towards A8, A9 to A11 forming a distinct club, antennae nearly reaching base of pronotum when laid back; gular sutures diverging apically, deeply sulcate proximal to gular sutures, gular process relatively broad.

Thorax: Average pronotal length:width ratio 1.1:1; pronotum dark red-brown, vested with short yellowish setae, pronotal arch with sparse but distinct punctation, interstices about two diameters of punctures, punctation on pronotum proper larger, interstices less than diameter of punctures; transverse sulcus on anterior part of mesosternum and mesepisternum distinct; prosternum red-brown, smooth, mesosternum red-brown; metasternum black, punctation fine but distinct, interstices about one diameter of punctures; anterior metasternal process with two strongly sclerotized, ventrally projecting, edges; scutellum oval, redbrown.

Elytra: Average length:width ratio 2.4:1; basal quarter dark red-brown but lighter near suture and on humeral angle, one of the examined specimens with lighter coloration, before middle one yellow fascia extending from suture to lateral margins, postmedian fascia dark red brown, before the apex one further yellow fascia, extreme apex yellow, subcutaneous structures visible through yellow areas, sparsely vested with short decumbent and few longer erect setae, punctation relatively small, striae 1 to 3 obsolete within start of the first yellow fascia, remaining striae entirely present, interstices between striae about one diameter of punctures, interstices within striae smaller, punctation slightly rasp-like in humeral region, distinctly carinated along striae 4 to 8 in postmedian fascia.

Legs: Dark red-brown; coxae, trochanters and proximal part of femora yellow; tarsal pulvilli brownish; metatibiae more or less straight, anterior and posterior face of each tibia carinate, carination slightly darker than tibiae.

Abdomen: Ventrites 1 to 3 dark red-brown to black, ventrites 4 to 6 yellow, punctation distinct, interstices one to two diameters of punctures; male pygidium broadest basally, lateral margins converging apically, apical margin is flattened; male ventrite 6 with distinct U-shaped emargination. Male genitalia ( Fig. 17 ): Tegminal sinus broadly and deeply V-shaped; phallic plates mostly broad, basal fifth narrow, phallic plates emarginate on the left side right before the tip in ventral view; spicular fork dividing into two branches at first quarter.

Distribution: Borneo.

Seasonal occurrence: Collected from April to December.

Etymology: Named after the region of its occurrence.

Figures

FIGURE 17. Xenorthrius bornensis: (A) Tegmen in ventral view, (B) phallus in ventral view, (C) tip of aedeagus in lateral view, (D) spicular fork, (E) male pygidium, (F) male ventrite 6 and distribution map.

FIGURE 63. Habitus photographs: Xenorthrius abruptepunctatus (A), Xenorthrius aurorafasciatus n. sp. (B), Xenorthrius balteatus (C), Xenorthrius beauforti (D), Xenorthrius berndi n. sp. (E) and Xenorthrius bornensis n. sp. (F). Scale bars = 4mm.