Cyclorhipidion petrosum, Smith & Beaver & Cognato, 2020

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China, ZooKeys 983, pp. 1-442 : 1

Cyclorhipidion petrosum sp. nov. Fig. 44C, D, J

Type material.

Holotype, female, Vietnam: Cao Bang, 22°34.118'N, 105°52.537'E, 1048 m, 12-17.iv.2014, VN9, Cognato, Smith, Pham, ex FIT (MSUC). Paratypes, female, Laos: NE, Hua Phan, Ban Saluei, Phu Pan (Mt.), 20°12'N, 104°01'E, 1300-1900 m, 27.iv-1.vi.2011, C. Holzschuh (NHMUK, 1). Thailand: Chiang Mai, Doi Pui, 6.viii.2002, R.A. Beaver, K. Koivisto (RABC, 3); as previous except: 1400 m, 16-20.viii.2004, W. Puranasakul, ex flight intercept trap (NHMUK, 1); as previous except: 27.ix-1.x.2004 (QSBG, 2); as previous except: 29.xi-3.xii.2004 (RABC, 2); as previous except: ex chestnut (RABC, 2); as previous except: 1200-1300 m, 28.vi.2014, S. Sanguansub et al., ex Fagaceae branch (SSC, 2; RABC, 1); as previous except: xii.2004, J. Hulcr, ex Castanopsis , uffeID 6603 (UFFE, 1); as previous except: Doi Inthanon, 900 m, 28.vii.2004, A.I. Cognato (RABC, 1); as previous except: Omkoi Wildlife Sanctuary, 28.vi.2013, C. Bateman, uffeID 11757 (UFFE, 8); as previous except uffeID 11758 (UFFE, 2). Loei, Phu Hin Rongkla N. Park Huai Man Daeng Naoi @ trail, 16°57'N, 101°03'E, 14.xii.2002-17.i.2003, G.W. Courtney, ex malaise trap (MSUC, 1). Vietnam: Cao Bang, 22°34.118'N, 105°52.537'E, 1048 m, 12-17.iv.2014, VN9, Cognato, Smith, Pham, ex FIT (MSUC, 1; NHMUK, 1; NMNH, 2).

Diagnosis.

3.9-4.1 mm long (mean = 4.02 mm; n = 5); 2.58-2.73 × as long as wide. This species is distinguished by large size; declivital slope gentle, gradual; separation between the smooth, shiny elytral disc and shagreened declivity gradual, not sharply distinct; declivital striae weakly impressed, strial punctures small, indistinct; declivital interstriae armed with a row of somewhat confused dense granules; and elytral apex and posterolateral margin armed with granules.

Similar species.

Cyclorhipidion denticauda , C. ohnoi , C. pilipenne .

Description

(female). 3.9-4.1 mm long (mean = 4.02 mm; n = 5); 2.58-2.73 × as long as wide. Body dark red-brown. Legs and antennae light brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes; surface subshiny, impunctate, alutaceous, rugose. Eyes deeply emarginate just above antennal insertion, upper part smaller than lower part. Submentum narrow, triangular, deeply impressed. Antennal scape regularly thick, as long as club. Pedicel as wide as scape, shorter than funicle. Funicle 4-segmented, segment 1 shorter than pedicel. Club approximately circular and flat, type 3; segment 1 corneous, transverse on anterior face, occupying approximately basal 2/5; segment 2 narrow, corneous; segments 1 and 2 present on posterior face. Pronotum: 0.89 × as long as wide. In dorsal view subquadrate, sides convex, type 3, narrowly rounded anteriorly; anterior margin without serrations. In lateral view elongate with disc much longer than anterior slope, type 7, disc flat, summit at apical 2/5. 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 subshiny, alutaceous, densely, finely punctate, finely setose, setae short, erect, hair-like. Lateral margins obliquely costate. Base transverse, posterior angles broadly rounded. Elytra: 1.82 × as long as wide, 2.05 × as long as pronotum. Scutellum large, broad, linguiform, shiny, flush with elytra, flat. Elytral base transverse, edge oblique, humeral angles rounded, parallel-sided in basal 4/5, then broadly rounded to apex. Disc flat, shiny, striae and interstriae densely setose, setae long, semi-recumbent, hair-like, striae and interstriae strongly confused, indistinguishable; striae and interstriae not impressed, minutely punctate, punctures strongly confused, separated by 2-5 diameters of a puncture. Declivity occupying 2/5 of elytra, declivital slope gradual, rounded, strongly shagreened, separation between the smooth, shiny disc and shagreened declivity gradual, not sharply distinct; six striae present, striae 2 equidistant between 1 and 3, striae weakly impressed, punctures small, shallow, indistinct, subcontiguous, shagreened, much larger than on disc; interstriae feebly convex, interstriae setose, setae dense, long, semi-erect hair-like; interstriae impunctate, coarsely granulate, granules dense, confused, variably sized. Posterolateral margin rounded, granulate. 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 11 moderate socketed denticles, their length approximately as long as basal width. Meso- and metatibiae broad, flattened; outer margin evenly rounded with 14 moderate socketed denticles.

Etymology.

L. petrosus = rocky, stony. In reference to the granular declivity. An adjective.

Distribution.

Laos, Thailand, Vietnam.

Host plants.

This species has only been recorded from Castanopsis ( Fagaceae ).

Figures

Figure 44. Dorsal, lateral and declivital view of Cyclorhipidion perpilosellum, 2.5 - 3.0 mm (A, B, I), C. petrosum holotype, 3.9 - 4.1 mm (C, D, J), C. pilipenne, 2.5 - 3.0 mm (E, F, K), and C. pruinosulum, 2.7 - 3.5 mm (G, H, L).