Hexarhopalus (Hexarhopalus) murudensis, Purchart, Luboš, 2010

Purchart, Luboš, 2010, Review of the genus Hexarhopalus Fairmaire, 1891 (Coleoptera, Tenebrionidae, Stenochiinae) from Borneo with description of new species, Zootaxa 2476, pp. 1-13 : 6-7

Hexarhopalus (Hexarhopalus) murudensis sp. nov.

( Fig. 5 )

Type locality. Borneo, Sarawak, Mt. Murud.

Type material. Holotype. (♂ BMNH): Borneo, Mt. Murud, 6–7.000 ft. [feet], Dr. E. Mjoberg // Brit. Mus., 1924 – 534. Paratype (1 BMNH): same data as holotype.

Condition of holotype: right antenna, left front claws, left hind tarsus and right hind tibia and tarsus missing.

Condition of paratype: Both front tarsi, left hind leg missing.

Differential diagnosis. Within the genus Hexarhopalus the new species most resembles H. montanus (Kaszab, 1982) from which it differs in the midlongitudinally depressed pronotum which is broadest at the middle, and the sides of pronotum are regularly rounded (in H. montanus the pronotum is not depressed and is broadest in anterior third. Sides of pronotum are almost subparallel).

Description. Size of holotype 8.0 x 3.5 mm. Size of paratype 7.5 x 3.2 mm. Entire body pale brown (Probably teneral specimen. In paratype, elytra, pronotum and head brown.), dull. Body elongate-oval, sculptured.

Head smooth, shagreened, micropubescent with yellowish setae, entire surface relatively densely, simply and finely punctate. Space between punctures approximately as large as an eye facet. Narrower than pronotum in ratio 1:1.3. Frontoclypeal sulcus at the base U-shaped, deep, almost reaching the clypeal margin. Distance between eyes 2 times as wide as their diameter (DV). Ocular sulcus moderately deep. Antenna slender, approximately 1.1 times as long as pronotum, covered with whitish setae.

Pronotum glabrous, entire surface irregularly sculptured with shiny tubercles, coarse punctures and wrinkles. This sculpture sharply separated from prothoracic hypomeron by a deep sulcus running from posterior to anterior angles, substituting for the lateral carina of the pronotum. This sulcus bent upwards anteriorly towards anterior margin of pronotum, forming anterior rim of the latter, but it is absent in the middle. Posteriorly it is coalescent with the rim of the pronotal base. The latter obliquely truncate anteriad to posterior angles. Oblique indentation in posterior angles short and deep. Pronotum midlongitudinally depressed centrally. Pronotum broadest at middle with regularly rounded sides. Prothoracic hypomeron shiny, glabrous, smooth, impunctate.

Elytra glabrous, oval, broadest at middle. 1.4 times as long as its width, 2.1 times longer and 1.46 times as wide as pronotum. Dorsum flat (LV), elytral declivity steep. Elytral striae indicated with more or less regular rows of punctures. These are slightly larger than eye facet. Elytral interstriae flat and covered irregularly with dull tubercles. The latter are of various sizes. The smallest ones are globular and approximately as large as an eye facet. The largest ones are longitudinal and approx. as large as the fourth antennomere. Base of elytra with slightly raised margin. Scutellum triangular.

Prosternum, prosternal process, mesoventrite and metaventrite glabrous and smooth. The space between meso- and metacoxa approx. 0.9 of diameter of mesocoxa. Abdominal ventrites smooth, micropubescent with yellowish setae and finely punctate.

Legs smooth, simply, finely but densely punctate. Femora claviform. Apical part of tibiae with moderately long yellowish setae underneath. Tarsi very sparsely pubescent above and with brush-like yellowish setae underneath.

Distribution. Borneo, Sarawak, Mt. Murud.

Etymology. Named after Mt. Murud (Borneo), the type locality..

Figures

FIGURES 1 – 6. Habitus, dorsal view. 1. Hexarhopalus barclayi sp. nov. (holotype); 2. H. becvari sp. nov. (holotype); 3. H. ferreri sp. nov. (holotype); 4. H. iwani sp. nov. (holotype); 5. H. murudensis sp. nov. (holotype); 6. H. rolandi sp. nov. (holotype).