Shigizo obrieni Pelsue, 2001

Frank W. Pelsue, Jr., 2001, A New Species Of Shigizo Morimoto From Borneo (Coleoptera: Curculionidae: Curculioninae: Curculionini), The Coleopterists Bulletin 55 (2), pp. 181-184 : 182-184

Shigizo obrieni Pelsue , new species

Figs. 1–5

Holotype. Malaysia. male[ Malaysia / Borneo /Sarawak/ S. Gunung Buda / 64 km s/o Limbang / 21–27 October 1996 / malaise trap / Nathan Schiff] CWOB

Paratypes. (2) male[ Malaysia / Borneo /Sarawak/ S. Gunung Buda / 64 km s/o Limbang / 21­27 October 1996 / N. Schiff] CWOB

Recognition Characters. Small in size, subrhombiform; derm piceous; apex of elytron broadly rounded dorsally; disc of pronotum with median longitudinal carina, large deep punctures, basolateral spots of several, narrow, elongate, decumbent, white scales; elytral intervals with two longitudinal rows of narrow, elongate, decumbent, white scales, remaining scales piceous; scutellum small, clothed with short narrow white scales.

Male: Length: 2.3–2.5 mm (mean­2.4) Width: 1.3–1.4 mm (mean 5 1.33). Head: Small­sized; punctures small, deep, with short piceous scales; ventrad with few small, clavate, white scales; eyes large, finely faceted; frons 0.125 as broad as head across eyes; fringe of small, clavate, white scales along margin of eye; indication of small interocular fovea. Rostrum : 1.5–1.6 mm (mean 5 1.53) in length; 0.64 as long as body; cylindrical; broader at base than apex; abruptly emerging from head; three dorsal carinae from frons to antennal insertion; punctures small, slot­like apically, distad of insertion of antennae; almost straight from base to antennal insertion, then slightly arced to apex; scrobe lateral; scape inserted at midpoint. Antennae: Scape 0.6 mm; Funicle: segment one 0.2 mm, two 0.1 mm, three 0.075 mm, four 0.075 mm, five 0.05 mm, six 0.05 mm, seven 0.1 mm, club 0.3 mm; funicle 0.8 mm; scape 0.75 as long as funicle; glabrous except for narrow, elongate, suberect, piceous scales; club oval, acuminate, clothed with velvety pile, with some erect seta­like scales, segment 1 longer than segment 7 of funiculus, as long as funicular segments 5–7. Thorax: Length 0.8–0.9 mm (mean 5 0.86). Width 1.1 mm, 0.78 as long as broad; base as broad as base of elytra; broadly rounded to constriction; disc with median longitudinal carina, with large shallow ridged punctures, with short clavate piceous scales, few white scales basolaterally and

4) median lobe lateral aspect; 5) median lobe, apex.

basomedially; pleuron with some narrow, elongate and broader, clavate, white scales; ventral median channel with short, broad, recumbent, clavate, white scales; post ocular lobe feebly prominent, covering portion of eye when rostrum in repose; scutellum small, impressed, longer than broad, clothed with narrow elongate white scales; mesepimeron with narrow elongate decumbent scales, with a few broad, clavate white scales; mesepisternum evenly clothed with clavate white scales; metepisternum clothed with narrow elongate decumbent scales with few clavate white scales; metasternum clothed with elongate, clavate, white scales; mesosternal intercoxal process not visible in lateral view; slightly convex in lateral view. Elytra: Length 1.35–1.5 mm (mean 5 1.45). Striae deep, with small punctures and short piceous scales; intervals broad, clothed with two longitudinal rows of narrow elongate white scales basally becoming scattered medially to apex, remaining scales piceous; disc with median declivity flat, in lateral view; humeri rounded; crosshatched setae erect, prominent, piceous. Legs: Length of hind femur 1.0– 1.1 mm (mean 5 1.03); not exceeding apex of abdomen; all femora with medium­sized tooth, acute apex, clothed with narrow elongate decumbent white scales; moderately clavate; tibiae sinuate, anteriorly near apex with comb of elongate erect seta­like scales; inner margin with large hook­like process toward apex, lacking uncus or mucro; pro­ and mesouncus large, longer than tarsal claw. Abdomen: Sternite 1 longer than 2 behind coxal cavity, with shallow median declivity, 1 and 2 appear fused medially; 2 ascending to 3; sternite 3 longer than 4; sternites 3 and 4 combined, longer than 5; sternite 5 with median tuft of narrow elongate erect seta­like white scales, with central declivity; all sternites clothed with elongate, clavate, white scales. Pygidium: Large , depressed medially; clothed with narrow, elongate, white, seta­like scales. Genitalia: Median lobe of aedeagus 0.5 mm in length, 0.15 mm in width, margins thin, broader toward apex than base, in dorsal view; arced toward apex, margins thicker in middle, in lateral view; apodeme 0.6 mm in length ( Figs. 3–5 ).

Plant Associations. Unknown.

Distribution. Malaysia: Borneo, Sarawak.

Remarks. This species is distinguished from S. rhombiformis by its lack of any pronounced white macula on the pronotum and elytra, the scutellum with white scales, and the median longitudinal carina on the pronotum.

Figures

Figs. 1–2. Shigizo obrieni n. sp., male, habitus, dorsal and lateral views, holotype.

Figs. 3–5. Shigizo obrieni n. sp., paratype, aedeagus 3) Median lobe, dorsal aspect;