Pocadius fasciatus Cline

Cline, Andrew R., 2008, Revision of the sap beetle genus Pocadius Erichson, 1843 (Coleoptera: Nitidulidae: Nitidulinae, Zootaxa 1799 (1), pp. 1-120: 61-63

publication ID

http://doi.org/ 10.11646/zootaxa.1799.1.1

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scientific name

Pocadius fasciatus Cline

new species

Pocadius fasciatus Cline   new species

(Figs. 18, 59, 102, 145, 187, 224)

Specimens examined. HOLOTYPE ♂ ( BMNH)   : INDONESIA: Borneo; Kalimantan Tengah; Busang / Rekut confl.; 0°03’S, 113°59’E / ‘ Barito Ulu 2001’; BMNH (E); 2001-191 / August 2001; Flight Intercept FIT 9; Brendell / Mendell. 8 GoogleMaps   PARATYPES (5 BMNH, 3 ARCC)   : same data label as HT except FIT 2. 1 PARATYPE (5 BMNH, 1 ARCC)   : same data label as HT except FIT 4. 1 PARATYPE ( BMNH)   : same data label as HT except FIT 6. 6 PARATYPES (5 BMNH, 1 ARCC)   : same data label as HT except “FIT 8”. 2 PARATYPES ( CAS)   : MALAYSIA: BORNEO: Sarawak, First Division; S. end Mt. Santubong ; N. of Kuching 21.IV.;1970 James E. Tobler   .

Diagnosis. Similar to P. yunnanensis   from China, but distinct from this and other species by: transverse pronotum, deep protibial notch, short fine decumbent rows of elytral setae, smooth shining interspaces on dorsum, male genitalia.

Description. Length 3.7mm, Width 1.8mm, Depth 1.0mm. Body moderately convex; distinctly shining; body brown to dark brown in color with basal 0.33 – 0.50 of elytra near margin lighter, venter somewhat lighter. Pronotal and elytral margins with short fimbriae. Dorsal and ventral pubescence pale yellow to white, short and fine.

Head surface moderately, irregularly punctate, large and small punctures interspersed on vertex, becoming smaller towards orbits and fronotclypeal region. Large punctures ~3X diameter of eye facet, small punctures 1X diameter; interspaces smooth. Pronotal surface with large punctures equal to 0.66 punctures on head, interspersed with few small punctures, 0.50 diameter large ones, small punctures interspersed with larger ones; interspaces smooth to very finely alutaceous, shining, 1.5 – 2.0 diameters apart. Scutellar surface with few shallowly impressed small punctures, equal to small ones on pronotum, interspaces smooth and shining. Elytral surface with serial rows of smaller punctures equal to small ones on pronotum, large punctures 3X diameter of small ones. Small punctures giving rise to semi-erect short setae, large punctures to shorter decumbent setae; interspaces broad between punctures of a row and between different rows. Within a row, small punctures separated by 4 diameters, large punctures by 0.33 diameter. Large rows separated by 1.5–2 diameters; interspaces smooth to very finely alutaceous, shining. Pygidium densely punctate, punctures equal to large and small ones on pronotum; interspaces narrow, 0.25 diameter apart, granular basally and smooth to alutaceous apically, shining.

Venter with similar pubescence as dorsum. Mentum with shallow punctures, equal to large ones on head, interspaces alutaceous to finely microreticulate. Prosternum and epimeron deeply irregularly punctate, punctures equal to large ones on head, punctures on prosternum smaller than on epimeron, interspaces alutaceous to granular with some microreticulation, prosternal punctures, smaller, 0.5–2 diameters apart, those on epimeron by 0.25–0.50 diameter. Mesoventrite with shallow punctures aggregated near metaventrite, equal to larger ones on elytra, interspaces alutaceous to finely granular, separated by 0.5 diameter. Metaventrite with faint irregular punctures on disc similar to small ones on head, lateral punctures equal to large ones on elytra, interspaces smooth on disc becoming microreticulate and granular laterally, punctures separated by 2–4 diameters on disc and more densely aggregated laterally by 0.50 diameter. Abdominal sternite 1 with small moderately impressed punctures, equal to large ones on head, interspaces alutaceous with some microreticulation, 0.5–2.0 diameters apart. Hypopygidium with moderately deep punctures, similar to those on sternites 2–4, interspaces alutaceous to granular, separated by 0.25–0.5 diameter.

Head wider than long (W:L = 1.33:1). Antennal club compact, obovate, strongly asymmetrical with terminal antennomere longer than 9–10 combined. Antennomeres 4–8 compact, 6–8 disc-like, 4–5 cuboid. Antennal scape distinctly asymmetrical, broadly hemispherical, 1.3X length of pedicel. Pedicel barrel-like, slightly asymmetrical. Antennal segment 3 slightly shorter than pedicel. Antennal club large, 0.9 length of segments 1–8 combined. Elevated region of mentum with anterior angles obsolete, anterior margin broadly rounded, overall hemispherical, slightly convex in lateral view.

Pronotum widest near middle (L:W = 1:1.9), anterior margin broadly shallowly concave, lateral margins slightly arcuate to anterior and posterior angles. Scutellum large, obtusely triangular, apical angle present. Prosternal process expanded posterior to procoxal cavities, in lateral view flattened anteriorly and posteriorly with slight convexity over procoxae; posterior face oblique. Mesoventrite extending to midway between mesocoxae, evenly convex for reception of metaventrite. Metaventrite wider than long (W:L = 2.8:1). Metepisternum with slight medial constriction, oblique line dividing anterior 0.1. First abdominal sternite with broad process between metacoxae. First sternite 2X longer than sternite 2. Sternites 2–3 subequal, 4 slightly larger than 2 or 3. Hypopygidium subequal to sternite 1.

Protibia with apical tooth prominent, slightly longer than tarsomere 1. Outer apical notch with 80° angle, notch depth deep, equal to tarsomeres 1 and part of 2 combined. Inner apical spine short, subequal to tarsomere 1. Mesotibia more heavily armed than protibia with dense stiff setae and slender spines along lateral edge. Outer apical process elongate robust, larger than protibial process. Inner apical spine equal to tarsomeres 1–2 combined. Metatibia similar to mesotibia, outer apical process and inner apical spine longer and more robust. Tarsomeres 1–4 robust, as wide as or wider than long.

Male genitalia well sclerotized. Anal sclerite with apex acute and short fimbria (Fig. 18). Spiculum gastrale with broad lateral flanges, medial margins concave, apex with few short setae (Fig. 59). Tegmen narrowly rounded (Fig. 102), much longer than wide (w:l = 1:3.3), lateral row of setae visible from prior to apex of median fossa around apex, elongate acuminate concavity in apical 0.5 with short stiff setae laterally not extending around apex, an additional row of setae between lateral and inner row in apical 0.25 of tegmen. Median lobe elongate with definite basal constriction, ~0.5 length of tegmen, apex rounded (Fig. 145). Ejaculatory rods elongate not fused to basal piece or each other, straight with apex swollen and base enlarged laterally. Basal piece of internal sac sclerites with two paired structures with basal margin directed medially and separate medial piece with deeply bifid basal margin (Fig. 187).

Female genitalia moderately sclerotized (Fig. 224). Paraprocts elongate with sclerotization along median line, not extending to baso-lateral angles. Gonocoxite with two basal lateral prominences, basal ridge well-

sclerotized with two moderately long oblique baculi. Gonocoxal apices elongate, narrowly separated by abbreviated concavity. Multiple short setae originate from small lateral depressions near gonocoxal apices.

Variation. One male paratype with fascia extending somewhat further than 0.50 length of elytra and one paratype with only faint fascia indicated. Males with pygidium truncate apically.

Seasonality/Habitat. Collected in April and August from forested areas.

Distribution. Known from type localities in southern and northern Borneo.

Notes. No fungal host data available.

Etymology. Specific epithet denotes the fascia present on the elytral humeri.


California Academy of Sciences