Cyclorhipidion muticum, 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 muticum sp. nov. Fig. 42G, H, L

Type material.

Holotype, female, India: Arunachal Pradesh, Etalin vicinity, 28°36'56"N, 95°53'21"E, 700 m, 12-25.v.2012, L. Dembický (ZFMK). Paratypes, female, as holotype (ZFMK, 2).

Diagnosis.

4.0 mm long (n = 3); 2.67 × as long as wide. This species is distinguished by the large size; declivity obliquely truncate, strongly shagreened and dull; pronotum longer than wide subquadrate from dorsal view (type 3); and declivital interstrial punctures replaced by a single row of tubercles.

Similar species.

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

Description

(female). 4.0 mm long (n = 3); 2.67 × 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 shagreened, impunctate, alutaceous, moderately rugose. Eyes deeply emarginate just above antennal insertion, upper part smaller than lower part. 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 1/3; segment 2 narrow, corneous; segments 1-3 present on posterior face. Pronotum: 1.05 × 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 shagreened, alutaceous, densely, finely punctate, setose, setae dense, long, fine hair-like. Lateral margins obliquely costate. Base transverse, posterior angles narrowly rounded. Elytra: 1.68 × as long as wide, 1.6 × 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 ascending posteriorly, shiny, basal 1/5 shagreened, striae and interstriae densely setose, setae long, semi-recumbent, hair-like, striae and interstriae strongly confused, indistinguishable; striae and interstriae not impressed, punctures strongly confused, separated by 2-5 diameters of a puncture. Declivity occupying 1/4 of elytra, obliquely truncate, face weakly convex, strongly shagreened, densely setose; six striae present, striae weakly impressed, striae 2 equidistant between 1 and 3, strial punctures large, shallow, subcontiguous, shagreened, much larger than on disc; interstriae weakly convex, interstriae very densely setose, setae long, semi-erect hair-like; interstriae impunctate, uniseriate tuberculate, tubercles numerous, moderately large and irregularly spaced. Posterolateral margin costate, granulate, extending laterally to interstriae 7; setose, setae long, fine, erect, hair-like. Legs: procoxae contiguous. Protibiae semi-circular with evenly rounded outer edge, broadest at apical 1/3; posterior face smooth; apical 1/3 of outer margin with 9-11 moderate socketed denticles, their length approximately as long as basal width. Meso- and metatibiae broad, flattened; outer margin evenly rounded with 16 moderate socketed denticles.

Etymology.

L. muticus = maimed, broken. In reference to the truncate declivity. An adjective.

Distribution.

India (Arunachal Pradesh).

Host plants.

Unknown.

Remarks.

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

Figures

Figure 42. Dorsal, lateral and declivital view of Cyclorhipidion inarmatum lectotype, 2.8 - 3.0 mm (A, B, I), C. japonicum, 2.1 - 2.3 mm (C, D, J), C. miyazakiense, 2.6 - 3.0 mm (E, F, K), C. muticum holotype, 4.0 mm (G, H, L).