Cyclorhipidion amputatum, 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 amputatum sp. nov. Fig. 40C, D, J

Type material.

Holotype, female, Vietnam: Cao Bang, 22°36.454'N, 105°52.083'E, 1661 m, 15.iv.2014, VN39, Cognato, Smith, Pham, ex 3-6 cm branches '(MSUC). Paratype, female, as holotype except: 22°36.454'N, 105°52.083'E, 1661 m, 17.iv.2014, VN40, ex 3 pieces “firewood” (VMNH).

Diagnosis.

5.0 mm long (n = 1); 3.13 × as long as wide. This species is distinguished by the large size; obliquely truncate declivity with rounded margins; pronotum wider than long and subquadrate from dorsal view (type 3); declivital interstriae punctures replaced by sparse, small, confused tubercles; declivital strial punctures large, distinct; declivital face appearing convex and strongly shiny; declivital striae clearly, uniformly impressed and interstriae inflated on apical 1/2.

Similar species.

Cyclorhipidion amasoides , C. circumcisum , C. muticum , C. truncaudinum , C. umbratum , all of which are large and have an obliquely truncate or truncate declivity.

Description

(female). 5.0 mm long (n = 1); 3.13 × as long as wide. Body, antennae, and legs red. 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 shallowly 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 as long as 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: 0.96 × as long as wide. In dorsal view subquadrate, sides convex, type 3, narrowly rounded anteriorly; anterior margin without serrations. In lateral view tall, type 2, disc flat, summit at midpoint. 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: 1.81 × as long as wide, 1.89 × 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 sharply angulate 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 1/3 of elytra, obliquely truncate, face convex, strongly shiny; five striae present, striae distinctly and uniformly impressed, striae 2 equidistant between 1 and 3, strial punctures large, distinct, subcontiguous to separated by two diameters of a puncture, subshiny, much larger than on disc; interstriae inflated on apical 1/2 of declivity, interstriae setose, setae dense, long, semi-erect hair-like; interstriae impunctate, coarsely tuberculate, tubercles sparse, small, strongly confused, variably sized. Posterolateral margin forming a circumdeclivital costa extending laterally to interstriae 7; costa granulate, setose, setae long, erect, fine, hair-like. Legs: procoxae contiguous; prosternal coxal piece tall and pointed. Protibiae semi-circular with evenly rounded outer margin, broadest at apical 1/3; posterior face smooth; apical 1/3 of outer margin with ten moderate socketed denticles, their length approximately as long as basal width. Meso- and metatibiae broad, flattened; outer margin evenly rounded with 15 moderate socketed denticles.

Etymology.

L. amputatus = cut away, lopped off. In reference to the chopped appearance of the elytra. An adjective.

Distribution.

Vietnam.

Host plants.

Unknown.

Remarks.

The holotype is card mounted and ventral characters could not be examined.

Figures

Figure 40. Dorsal, lateral and declivital view of Cyclorhipidion amasoides holotype, 4.2 mm (A, B, I), C. amputatum holotype, 5.0 mm (C, D, J), C. armiger lectotype, 2.6 - 3.3 mm (E, F, K), and C. bodoanum, 1.9 - 2.2 mm (G, H, L).