Cyclorhipidion taedulum Smith, Beaver, Pham & 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 : 13-14

Cyclorhipidion taedulum Smith, Beaver, Pham & Cognato sp. nov.

( Figs 41–44 )

http://zoobank.org/ urn:lsid:zoobank.org:act:33F3D649-FE24-4F82-9BE6-9166B4CD7040

Type material. Holotype, female: VIETNAM, Lao Cai Prov., Hoang Lien N.P., 22.35N, 103.77E, 1500–2000m, 21.v.2019, VN198, SM Smith, AI Cognato, ex 2 cm branch, SAX 392 [DNA voucher], MSUC_ARC_314131 ( MSUC) . Paratype, female: as holotype except: SAX393 [DNA voucher], MSUC_ARC_314132 (1, MSUC) .

GenBank. CAD: OP607178 ; OP607179 and COI: OP617749 ; OP617750 .

Diagnosis. This species is distinguished by the short, steep declivity that is ~1/5 of total elytral length, armed with moderate tubercles on interstriae 1 and 3, interstriae 2 always unarmed; moderate body length; posterolateral margins rounded; declivital interstriae 1 setae in two confused rows, interstriae 2 setae uniseriate; and the declivity strongly shagreened, strial punctures shallow, obscure.

The species is most similar to C. inarmatum and C. cognatoi Lin & Smith 2022 with which it shares similar declivital setal pattern and body size but both of which have a strongly shining elytral declivity. C. taedulum can be distinguished from both by the elytral length/width ratio and elytral/pronotal length/width ratio. In C. taedulum the elytra is 1.89 × as long as wide and 1.7 × as long as pronotum. In C. cognatoi the elytra is 1.67–1.79 × as long as wide and 1.46–1.58 × as long as pronotum and in C. inarmatum the elytra is 1.62–1.70 × as long as wide and 1.31–1.41 × as long as pronotum.

Similar species. This species closely resembles C. inarmatum , C. bodoanum , C. cognatoi all of which have two rows of confused setae on declivital interstriae 1 and one row of setae on declivital interstriae 2.

Description (female). 2.7 mm long (mean = 2.7 mm; n = 2); 3.0 × as long as wide. Body light brown, antennae and legs light brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes; surface subshining, impunctate, alutaceous, finely rugose; median line feebly elevated. Eyes deeply emarginate just above antennal insertion, upper part smaller than lower part. Submentum narrow, triangular, deeply impressed. Antennal scape short and thick, as long as club. Pedicel narrower than scape, as long as funicle. Funicle 4-segmented, segment 1 shorter than pedicel. Club approximately circular and flat, type 3; segment 1 corneous, transverse on anterior face, occupying about 2/5 of club; segment 2 narrow, soft; segments 1‒2 present on posterior face. Pronotum 1.11 × as long as wide. In dorsal view very elongate and rounded frontally, type 9, sides parallel on basal 3/4; anterior margin without serrations. In lateral view elongate with disc much longer than anterior slope, type 8, disc flat, summit at apical 1/3. Anterior slope shagreened, with densely spaced, fine, narrow asperities, becoming lower and more strongly transverse towards summit, bearing long, fine, semi-recumbent, hair-like setae. Disc subshining, alutaceous, densely, finely punctate, finely setose, setae short, erect, hair-like. Lateral margins obliquely costate. Base transverse, posterior angles broadly rounded. Scutellum moderate, broad, linguiform, flush with elytra, flat, shining. Elytra: 1.89 × as long as wide, 1.7 × as long as pronotum. Base transverse, edge oblique, humeral angles rounded, parallel-sided in basal 4/5, then broadly rounded to apex. Disc flat, shining, striae and interstriae moderately setose, setae long, semi-recumbent, hair-like; striae not impressed, punctures small, uniseriate, spaced by 1.5 diameters of a puncture; interstriae not impressed, minutely punctate, punctures much smaller than strial punctures, strongly confused, separated by more than 2‒5 diameters of a puncture. Declivity occupying 1/5 of elytra, steeply rounded, declivital face convex, strongly shagreened, separation between the smooth, shining disc and shagreened declivity distinct; three striae present, striae not impressed, punctures large, shallow, subcontiguous, shagreened, much larger than on disc; interstriae flat, minutely punctate, interstriae 1 bearing two rows of confused setae on declivital face, interstriae 2 being one row of uniseriate setae, setae long, semi-erect; interstriae 1 and 3 with three tubercles along their length, interstriae 2 unarmed. Posterolateral margin rounded, granulate, extending to interstriae 7. Legs: procoxae contiguous; prosternal coxal piece tall and pointed. Protibiae semi-circular with evenly rounded outer edge, broadest at apical 1/3; posterior face smooth; apical 1/3 of outer margin with seven or eight moderate socketed denticles, their length approximately as long as basal width. Meso- and metatibiae broad, flattened; outer margin evenly rounded each with ten and ten or 11 moderate socketed denticles, respectively.

Distribution. Vietnam.

Host plants. Unknown.

Etymology. L. taedulus = boring. The hackneyed appearance of this species is a recurring pattern among pseudocryptic Cyclorhipidion . A variable adjective.

Figures

FIGURES 37‒48. Lateral, dorsal, posterior oblique and anterior view of Cyclorhipidion nepalense holotype, 2.7 mm (37–40), Cyclorhipidion taedulum holotype, (41–44), Cyclorhipidion titorum holotype, 2.71 mm (45–48).