Xyleborinus acanthopteron Smith, Beaver & Cognato, 2022

Smith, Sarah M., Beaver, Roger A., Pham, Thai Hong & Cognato, Anthony I., 2022, New species and new records of Xyleborini from the Oriental region, Japan and Papua New Guinea (Coleoptera: Curculionidae: Scolytinae), Zootaxa 5209 (1), pp. 1-33 : 19

Xyleborinus acanthopteron Smith, Beaver & Cognato sp. nov.

( Figs 61–64 )

http://zoobank.org/ urn:lsid:zoobank.org:act:1122E2F2-0E6A-4E0E-9D89-E7320313921A

Type material. Holotype, female: THAILAND, Chiang Mai, Doi Pui , 18–22.x.2004, TH2, W. Puranasakul, ex ethanol trap, MSUC_ARC_314133 ( MSUC) . Paratypes, as holotype except: xi.2004, S.A. Dole, THA 149, MSUC_ ARC_314137 (1, MSUC), i.2005, S.A. Dole, THA 193, MSUC_ARC_314138 (1, MSUC) .

GenBank. CAD: OP607261 and COI: OP617825 .

Diagnosis. This species is distinguished by the posterior margin of elytra broadly rounded; declivital face with interstriae 1 and 2 unarmed by tubercles; declivital face moderately sulcate, striae punctate; lateral declivital margins elevated, bearing 6–8 pairs of small to moderate, narrow, sharply pointed and recurved spines (often asymmetric) on basal 2/3 of declivity; and sulcate area of declivity shagreened, subshining.

Similar species. Xyleborinus dumosus sp. nov., Xyleborinus echinopterus Smith, Beaver & Cognato, 2020 , X. octiesdentatus ( Murayama, 1931) , X. kwangruengensis Park & Smith, 2020 (in Park et al. 2020)

Description (female). 2.5 mm long (mean = 2.5 mm; n = 3); 2.78 × as long as wide. Body, legs, and antennae uniformly brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes, alutaceous, dull, densely, coarsely punctate, setose; punctures each a long, erect hair-like seta. Eyes shallowly emarginate just above antennal insertion, upper part smaller than lower part. Submentum large, distinctly triangular, deeply impressed. Antennal scape regularly thick, as long as club. Pedicel as wide as scape, as long as funicle. Funicle 4-segmented, segment 1 shorter than pedicel. Club longer than wide, obliquely truncate, type 1; segment 1 corneous, encircling anterior face; segment 2 narrow, concave, corneous on anterior face only; sutures absent on posterior face. Pronotum 1.11 × as long as wide. In dorsal view basic and parallel-sided type 2, sides parallel in basal 2/3, rounded anteriorly; anterior margin without serrations. In lateral view elongate, disc longer than anterior slope, type 7, summit low, on apical 2/5. Anterior slope with densely spaced narrow asperities, becoming lower and more strongly transverse towards summit, bearing long, fine, semi-recumbent, hair-like setae. Disc subshiny, alutaceous, finely punctate, finely setose, setae short, erect, hair-like, some longer hair-like setae at margins. Lateral margins obliquely costate. Base transverse, posterior angles acutely rounded. Scutellum minute, conical, disconnected from elytra, surrounded by dense mycangial tuft of setae. Elytra: 1.67 × as long as wide, elytra 1.50 × as long as pronotum. Base transverse, medially emarginate near scutellum and mycangial tuft, edge oblique, humeral angles angulate, parallel-sided in basal 3/4, then broadly rounded to apex. Disc occupying basal 2/3, smooth, shiny, glabrous, unarmed; striae not impressed, glabrous, with moderate punctures separated by 1–2 diameters of a puncture; interstriae flat, sparsely finely biseriate punctate, punctures 1/2 as large as those of striae, each bearing erect hair-like setae, setae approximately as long as width of interstriae 2. Declivital face steeply rounded, moderately sulcate between interstriae 3, shagreened, subshiny, striae and interstriae moderately setose, setae long, semi-erect hair-like, as long as the distance between suture and interstriae 3 on declivital margins and semi-recumbent and no longer than an interstrial width on declivital face; three striae present, striae 1 and 2 subcontiguous, confused; strial punctures larger, deeper than on disc; interstriae 1 and 2 flat, armed by two and three denticles, respectively on declivital base, unarmed on face; interstriae 2 very narrow; interstriae 3 forming declivital margin, distinctly elevated, 6–8 pairs of small to moderate, narrow sharply pointed and recurved spines (often asymmetric) on basal 2/3. Posterolateral margin rounded, denticulate from interstriae 3–7. Legs: procoxae contiguous, prosternal coxal piece inflated. Protibiae obliquely triangular, broadest at apical 1/3; posterior face smooth; apical 1/3 of outer margin with seven moderate socketed denticles, their length approximately as long as basal width. Meso- and metatibiae flattened, outer margin evenly rounded with eight moderate socketed denticles.

Distribution. Thailand.

Host plants. Unknown.

Etymology. G. acanthos - = thorn, -pteron = wing. In reference to the spines on the elytral declivity. A noun in apposition.

Figures

FIGURES 61‒72. Lateral, dorsal, posterior oblique and anterior view of Xyleborinus acanthopteron holotype, 2.5 mm (61–64), Xyleborinus dumosus holotype, 2.9 mm (65–68), Xyleborinus nobuchii holotype, 2.2 mm (69–72).