Cyclorhipidion druk Smith & Beaver, 2022

Beaver, Roger A. & Smith, Sarah M., 2022, The bark and ambrosia beetles of Bhutan (Coleoptera: Curculionidae: Scolytinae and Platypodinae): a synopsis with three new species of Scolytinae, Zootaxa 5174 (1), pp. 1-24 : 3

Cyclorhipidion druk Smith & Beaver sp. nov.

( Figs 1‒4 )

http://zoobank.org/ urn:lsid:zoobank.org:act:5686C839-BD36-4A9D-B347-A6FD6EA2A4FD

Type material. Holotype, female: Bhutan, Gedu, 6.viii.[19]85, B.S. Padgham coll., ex Castanopsis CIE A 17491, NHMUK014591745 ( NHML) . Paratypes, as holotype except B.F. Padgham coll., NHMUK014591826 - NHMUK014591830 ( NHML, 5) .

Diagnosis. 3.3−3.4 mm long (mean = 3.38 mm; n = 5); 2.75−2.83 × as long as wide. This species can be distinguished by the small size and stout form, obliquely truncate declivity with granulate margins, pronotum longer than wide and subquadrate from dorsal view (type 3); declivital interstriae with confused granules; declivital interstriae 2 weakly impressed.

Similar species. Cyclorhipidion amasoides Smith, Beaver & Cognato , C. amputatum Smith, Beaver & Cognato , C. circumcisum (Sampson) , C. muticum Smith, Beaver & Cognato , C. truncaudinum Smith, Beaver & Cognato , C. umbratum (Eggers) , all of which are large and have an obliquely truncate or truncate elytral declivity.

Description (female). 3.3−3.4 mm long (mean = 3.38 mm; n = 5); 2.75−2.83 × as long as wide. Appearing bicolored: body, antennae, legs, elytral base light red brown, declivity dark red brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes; surface subshining, 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 about basal 1/3; segment 2 narrow, corneous; segments 1‒2 present on posterior face. Pronotum: 1.08 × 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 as long as anterior slope, type 7, 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 subshining, alutaceous, densely, finely punctate, finely setose, setae short, erect, hair-like. Lateral margins obliquely costate. Base transverse, posterior angles broadly rounded. Elytra: 1.75 × as long as wide, 1.62 × as long as pronotum. Scutellum large, broad, linguiform, shining, 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, shining, striae and interstriae densely setose, setae long, semi-recumbent, hair-like, strial and interstrial punctures strongly confused, indistinguishable; striae and interstriae not impressed, minutely punctate, punctures separated by 1‒4 diameters of a puncture. Declivity occupying 1/3 of elytra, obliquely truncate, face weakly impressed along interstriae 2, shagreened, dull; 5 striae present, striae 1 distinctly impressed, striae 2 closer to striae 3 than striae 1, strial punctures large, distinct, shagreened, subcontiguous, much larger than on disc; interstriae 1, 3‒5 weakly convex, interstriae densely setose, setae long, semi-erect hair-like; interstriae impunctate, confusedly granulate, granules numerous on interstriae 1, 3‒5, moderately large and irregularly spaced; interstriae 2 granules smaller, less abundant than other interstriae. Posterolateral margin costate, granulate, extending laterally to interstriae 7; setose, setae long, fine, erect, 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 9 moderate socketed denticles, their length approximately as long as basal width. Meso- and metatibiae broad, flattened; outer margin evenly rounded with 17 and 12 moderate socketed denticles, respectively.

Distribution. Bhutan.

Host plants. Castanopsis (Fagaceae) .

Etymology. Druk (Dzongkha) = Thunder Dragon. The Druk is a Bhutanese national symbol after which the country is named. Noun in apposition.

Figures

FIGURES 1‒4. Cyclorhipidion druk holotype, 3.4 mm. Dorsal, lateral, posterior oblique and anterior views.