Cyclorhipidion truncaudinum, 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 truncaudinum sp. nov. Fig. 45G, H, L

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). Paratypes, female, as holotype (MSUC, 1; VMNH, 1).

Diagnosis.

4.0 mm long (mean = 4.0 mm; n = 3); 2.67-2.86 × as long as wide. This species is distinguished by the large size; truncate declivity surrounded by a granulate circumdeclivital costa; pronotum subquadrate from dorsal view (type 3); declivital interstrial punctures replaced by a single row of tubercles; declivital strial punctures large, distinct; declivital face with three striae, distinctly sulcate on basal 1/2, surface rugose, coarsely sculptured and appearing undulating; declivital striae impressed, striae 1 more deeply impressed; and interstriae 1 inflated on apical 1/3 and interstriae 2 and 3 flat.

Similar species.

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

Description

(female). 4.0 mm long (mean = 4.0 mm; n = 3); 2.67-2.86 × as long as wide. Body dark red-brown. Legs and antennae dark 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 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: 0.95-0.97 × 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: 1.62-1.87 × as long as wide, 1.7-1.92 × 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, truncate, face alutaceous, subshiny, appearing undulating, sulcate on basal 1/2; three striae present, striae distinctly impressed, striae 1 more deeply than 2 or 3, strial punctures large, distinct, subcontiguous, shagreened, much larger than on disc; interstriae setose, setae dense, long, semi-erect hair-like; interstriae convex, impunctate, coarsely uniseriate tuberculate, tubercles increasing in size apically; interstriae 1 strongly convex on apical 1/3. Posterolateral margin forming a circumdeclivital carina; carina granulate, setose, setae long, fine, erect. Legs: procoxae contiguous; prosternal coxal piece tall, conical. Protibiae semi-circular with evenly rounded outer edge, 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.

In reference to the likeness to Truncaudum . An adjective.

Distribution.

Vietnam.

Host plants.

Recorded from Lithocarpus ( Fagaceae ).

Figures

Figure 45. Dorsal, lateral and declivital view of Cyclorhipidion pruinosum, 3.5 - 4.1 mm (A, B, I), C. sisyrnophorum, 3.3 - 4.0 mm (C, D, J), C. tenuigraphum, 2.7 - 3.0 mm (E, F, K), and C. truncaudinum holotype, 3.9 - 4.1 mm (G, H, L).