Cyclorhipidion amasoides, 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 amasoides sp. nov. Fig. 40A, B, I

Type material.

Holotype, female, India: Arunachal Pradesh, Hunli vicinity, 28°19'32"N, 95°57'31"E, 1300 ± 100 m, 26.v.2012, L. Dembický (ZFMK).

Diagnosis.

4.2 mm long (n = 1); 2.8 × as long as wide. This species is distinguished by the large size; declivity truncate; pronotum subquadrate from dorsal view (type 3); declivital face with three striae; declivity strongly tumescent from apex to basal 1/4 and laterally from sutural margin to striae 2; declivital interstriae 1 coarsely granulate, interstriae 2-4 minutely punctate, and surface shiny.

Similar species.

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

Description

(female). 4.2 mm long (n = 1); 2.8 × as long as wide. Head and 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 shiny, impunctate, alutaceous, feebly rugose. Eyes shallowly 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 1/4; segment 2 broad, 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 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 shiny, densely, finely punctate, glabrous. Lateral margins obliquely costate. Base transverse, posterior angles broadly rounded. Elytra: 1.74 × as long as wide, 1.9 × as long as pronotum. Scutellum large, broad, linguiform, flush with elytra, flat, shiny. Elytral base transverse, edge oblique, humeral angles rounded, parallel-sided in basal 4/5, then sharply angulate to apex. Disc ascending posteriorly, shiny, striae and interstriae densely setose, setae short, recumbent, hair-like; striae and interstriae laterally diverging from base to declivital summit; striae not impressed, punctures separated by 1-4 diameters of a puncture; interstriae flat, punctate, punctures minute, 1/2 size of strial punctures, strongly confused. Declivity occupying 1/3 of elytra, truncate, face strongly tumescent from apex to basal 1/4 and laterally from sutural margin to striae 2, strongly shiny; three striae present, striae not impressed, equidistant, strial punctures shiny, moderately sized, shallow, much larger than on disc, punctures irregular, variably spaced by 1-4 diameters of a puncture; interstriae setose, setae sparse, short, erect hair-like; interstriae 1 impunctate, coarsely granulate, granules increasing in size apically, interstriae 2-4 punctate, punctures minute, strongly confused, less than 1/2 size of strial punctures. Posterolateral margin forming a circumdeclivital carina; carina feebly rugose, setose, setae short, fine. 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 nine moderate socketed denticles, their length approximately as long as basal width. Meso- and metatibiae broad, flattened; outer margin evenly rounded with 13 and 11 moderate socketed denticles, respectively.

Etymology.

In reference to the likeness to Amasa . Noun in apposition.

Distribution.

India (Arunachal Pradesh).

Host plants.

Unknown.

Remarks.

The holotype is card mounted and ventral characters could not be examined. This species exhibits strong morphological convergence with Amasa . It is distinguished from Amasa by the type 3 antennal club with transverse sutures, subquadrate pronotum (type 3) that lacks serrations on anterior margin and the elytral disc densely setose with strial and interstrial punctures minute and strongly confused.

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).