Pediacus carinatus Marris & Ślipiński, 2014

Marris, John W. M. & Ślipiński, Adam, 2014, A revision of the Pediacus Shuckard 1839 (Coleoptera: Cucujidae) of Asia and Australasia, Zootaxa 3754 (1), pp. 32-58 : 39

Pediacus carinatus Marris & Ślipiński , sp. nov.

Figs. 3 E–I.

Diagnosis. Recognisable by the combination of the following characters: body form broad, head and pronotum puncturation deeply impressed and more or less evenly dense with punctures separated by distinctly less than their diameter; eyes strongly projecting; pronotum strongly transverse with sides convergent anteriorly and strongly explanate, posterior denticle acute to narrowly acute, elytra with sublateral margins of disc carinate and epipleura very strongly explanate.

Description. Body length 2.9–3.8 mm (n=9), broad, 2.52× longer than wide; colour uniform dark brown, legs paler, tarsi yellow-brown; pubescence short, pale, appressed and inconspicuous; surface dull. Head transverse, 1.75× wider than long; puncturation deeply impressed and more or less evenly dense with punctures separated by distinctly less than their diameter; setae very short and appressed, inconspicuous; microsculpture reticulate, surface dull; eyes large, strongly projecting, ocular index 0.7, finely faceted, postocular denticle absent; antennae as in Fig. 3 G, antennomere VII and VIII distinctly larger than VI. Pronotum strongly transverse, 1.45× wider than long, widest at about posterior 1/3, sides convergent anteriorly; lateral margins strongly explanate and reflexed, denticles prominent but form variable, anterior, antero-medial and postero-medial denticles moderately to strongly produced and broadly obtuse to acute, posterior denticle acute to narrowly acute; disc weakly convex to weakly impressed; puncturation as for head with impunctate median strip absent; setation and microsculpture as for head with lateral margins granulate. Elytra broadly elongate, 1.69× longer than wide, sides subparallel, sublateral margins of disc carinate; epipleura very strongly explanate, reflexed; puncturation dense and strongly impressed basally and laterally, puncturation faint on disc; setation short, appressed and inconspicuous; microsculpture reticulatecoriaceous to coriaceous on disc. Genitalia for male as in Fig. 3 H, parameres globular; internal sac with very large elongate tooth-like projections basally and smaller teeth apically and with a weakly sclerotized apical section.

Type material. Holotype (male): “[ Indonesia] SUMATRA (N. [North]), BRASTAGI [sic, Berastagi] G. Sibayak, 1450–1900m 19.–23.II. 1921 Bocák & Bocáková lgt. // HOLOTYPE Pediacus carinatus Marris & Ślipiński 2013 ”. Specimen on card point with genitalia mounted in DHMF on card below; deposited in NHMB.

Paratypes. INDONESIA: Sumatra: SUMATRA (N. [North]), BRASTAGI [sic, Berastagi ] G. Sibayak, 1450–1900m 19.–23.II. 1921 Bocák & Bocáková lgt. (16, NHMB); Borneo: Mt Tibang 1,700 m., O. Borneo Mjöberg (1, USNM); BORNEO: Sabah Mt. Kinabalu N. P. Headquarters 1558m IX/2–4/88, Small cut sapling D.E. Bright Collector (1, USNM). MALAYSIA: MALAYSIA: Selangor Fraser Hill, 1300 m 14.8.1993 leg. Schuh (1, CRS). THAILAND: Chiang Mai Doi Inthanon 19.V.1988, Thailand G. Minet (1, NHMB); Thai [ Thailand] 18.– 23.IV.1991 DOI SUTHEP-PUI 1300–1500 m leg. P. Pacholatko (1, NHMW); NW-THAILAND: 23.–31.5. Mae Hong Son 1992 Ban Si Lang, 1200m leg. J. Horak (2, NHMW) ; “NW-THAIL [ Thailand] 7.–14.V. Doi Suthep–Doi Pui 1300–1500 m leg. 1992 leg. P. Pacholatko (1, NHMW); NE [sic, NW] Thailand, 19–22.4 1991, Chieng [sic, Chiang ] Mai prov. Doi Suthep , S. Bily leg” (3, NHMB); NW Thailand, 1991 Chiang Mai, 18.49N, 99.00E Doi Suthep to Doi Pui 19.–23.4., L. Dembický leg. (1, NHMB); N– THAILAND: Nan Prov. Doi Phu Kha N. P. Headq. 19˚ 13' N 101˚ 07' E 22.– 26.4.1999 lg. Hauck” (1, CRS).

Distribution. Indonesia (Sumatra, Borneo), Malaysia (West Malaysia), Thailand.

Etymology. The species epithet refers to this species’ distinctive carinate sublateral margins of the elytra, a feature that is unique among the genus.

Figures

FIGURE 3. Pediacus species: (A – D) Pediacus bhutanicus Sen Gupta, holotype; P. carinatus sp. nov. (E, H, I) specimen from Sumatra; (F, G) specimen from Thailand. (A, E, F) Head and pronotum; (B, I) dorsal habitus; (C, G) antenna; (D, H) aedeagus.