Clivina trachys Andrewes, 1930

Balkenohl, Michael, 2021, Belgian Journal of Entomology, Belgian Journal of Entomology 115, pp. 1-83 : 28-30

publication ID 10.5281/zenodo.5645953


persistent identifier

treatment provided by


scientific name

Clivina trachys Andrewes, 1930


Clivina trachys Andrewes, 1930 View in CoL

( Figs 15 View Figs 9–15 , 22 View Fig , 42 View Fig , 62 View Fig , 79 View Fig , 89 View Fig , 108 View Fig )

Clivina trachys ANDREWES, 1930a: 1 View in CoL ; CSIKI, 1933: 639, 2005: 144; LORENZ, 1998: 134; BALKENOHL, 2001: 16.

TYPE MATERIAL. Holotype: • ♀, with labels and data: white, small, black printed “ Medan Mjöb .” / white, handwritten with black ink and black printed “ Clivina trachys Andr. Type H.E. Andrewes det.” / blue, black printed “4257 E91 +” / white, black printed “ NHRS- JLKB 000065317 ” ( Fig. 15 View Figs 9–15 ) ( NHRS) .

Paratypes: • 1 ♂, with labels and data: white, small, black printed “ Medan Mjöb .” / white, handwritten with black ink and black printed “ Clivina trachys Andr. Cotype H.E. Andrewes det.” / blue, black printed “4256 E91 +” / white, black printed “ NHRS- JLKB 000065316 ” ( NHRS); • 1 ♀, with labels and data: white, small, handwritten female symbol with black ink / white, small, black printed “ Sumatra ” / white, small, black printed “Coll. Kraatz ” / red, printed “COTYPUS” / white, handwritten with black ink and black printed “ Clivina trachys Andr. Cotype H.E. Andrewes det.” / white, black printed DEI Müncheberg Col – 09366 ” / red, printed “ Paratypus ” / white, handwritten with black ink “ Clivina trachys Andr ” ( SDEI) .

REMARKS. In the holotype the right hind leg is missing. In the male paratype the following parts are missing: five right terminal antennomeres, four terminal tarsomeres at the right front and intermediate leg, each. The holo- and paratype show a pin hole at the right elytron. In the female paratype, the right five terminal antennomeres and the intermediate leg are missing, the right elytron shows cracks latero-apically. In addition, the specimen exhibits an empty hind body obviously due to a former dissection attempt. The specimen is glued (DEI). The three specimens are conspecific.

DIAGNOSIS. Alarge sized species with smooth lateral margin of the pronotum and elytron, and without reticulation on the intervals of the elytron. The only other species which shows on the elytron two additional tubercles at the base and glossy intervals is C. clivinoides . However, C. clivinoides differs in the much smaller size, the subsquare outline of the pronotum where the lateral channel is not widened between the setigerous punctures, and the position of the first setigerous puncture on interval three of the elytron.

REDESCRIPTION. Measurements. Holotype: Body length 9.18 mm, width 2.69 mm; ratio length/width of pronotum 0.84; ratio length/width of elytra 1.9. All material: Body length 9.18– 9.49 mm (: = 9.3 mm *), width 2.65–2.76 mm (: = 2.7 mm *), ratiolength/widthofpronotum 0.81–0.83 (: = 0.82*), ratiolength/widthofelytra 1.83–1.89 (: = 1.87*); (*n = 3).

Colour: Glossy. Fuscous. Intermediate and hind leg, antennae and tarsomeres hinnuleous.

Head: More than a third narrower than pronotum. Clypeus distinctly emarginate anteriorly, laterally angled; wing slightly less protruding as clypeus, rounded, flattened, separated from clypeus by distinct notch; supraantennal plate convex; clypeus and supraantennal plate distinctly reflexed margined. Supraantennal plate extended up to mid-eye level, with rugae at mid-eye level, separated from wing by sharp notch. Clypeus with transverse elevation, separated from frons by distinct deep furrow. Frons moderately convex, with distinct pore at middle, with blunt lateral carina at posterior eye-level. Clypeus and frons with some fine scattered punctures, separated from wing and supraantennal plate by deep and wide furrow continuing posteriorly as deep and wide supraorbital furrow with two supraorbital setigerous punctures at posterior eye level. Neck constriction developed as distinct step, with narrow band of reticulation. Eye laterally projecting. Gena indistinct. Antenna reaching posterior angle of pronotum, antennomeres four to ten oblongo-elongate (ratio L/ W 2.1 -2.2). Labrum slightly convex anteriorly, with isodiametric reticulation, seven setose. Mentum ( Fig. 42 View Fig ) with isodiametric reticulation, lateral lobe carinate anteriorly and laterally, lateral carina somewhat removed from margin, lateral margin sinuate, anteriorly with acute lateral tooth and second tooth towards middle, emarginated between teeth, with wide median tooth which is nearly straight anteriorly and not as far projecting as teeth of lateral lobes.

Pronotum ( Fig. 62 View Fig ): Disk slightly convex, flattened in frontal and lateral view, distinctly convex at basal declivity. Square, wider than long. Reflexed lateral margin smooth, nearly straight at middle but slightly converging anteriorly, widest at posterior third; anterior angle obtusely rounded off, indistinctly projecting; posterior angle developed as distinct tooth. Lateral channel with series of small pits between the two setigerous punctures, distinctly widened between anterior and posterior setigerous puncture. Median line narrow, line-like; anterior transverse line wider, punctured, joining median line, joining basal constriction. Surface with transverse wrinkles, with group of punctures laterally, with isodiametric reticulation laterally and at base.

Elytron: Disk flattened in anterior half in lateral view, convex on frontal view. Less than twice as long as wide, slightly dilated in apical half, maximum width behind middle. Reflexed lateral margin smooth. Scutellar striole distinct; setigerous tubercle at base of first stria, with distinct tubercle at base of second interval, with small tubercle at base of third interval. Striae moderately deep, punctuate-striate, one to three free at base, four to seven joining at humerus, one to three ending free at apex, four and five just not joining apically, six ending free at apex. Intervals moderately convex, eight carinate at humerus and at apex. Third interval with four setigerous punctures, all approaching third stria, first one removed from base. Surface of all intervals glossy.

Hind wings: Fully developed.

Lower surface: Proepisternum covered completely with distinct isodiametric reticulation and laterally with transverse wrinkles ( Fig. 79 View Fig ). Terminal sternite of abdomen at apex with flat transverse sulcus.

Legs: Legs covered with longitudinal reticulation. Protibia with three slender somewhat elongated spines, sulcate dorsally, movable spur regularly arcuate.

Male genitalia ( Fig. 89 View Fig ): Median lobe of moderate length, slender, moderately and regularly arcuate at middle, nearly straight apically, with two slight cracks, one at end of basal third and one before apical tip. Ventral rim indistinct. Apex flat, wide, rounded, the apical tip is turned by about 45° to the median lobe. Endophallus at middle with some short bristles. Ventral paramere long, slender, both apophyses small, apex regularly tapered, with two long apical setae and two short preapical setae inserted obliquely to paramere. Dorsal paramere more convex at middle, with slender apophyses, at apex with two long setae, preapically with two small setae inserted right-angled to paramere.

Female coxostylus and laterotergite ( Fig. 108 View Fig ): Coxostylus short, slender, dorsally with eight setae of different length and with one long and robust nematiform seta, ventrally with two long and robust nematiform setae and a small series of smaller setae. Laterotergite with three long and two small setae basally and one isolated seta towards coxostylus.

VARIATION. In the paratypes the neck constriction shows a few minute punctures among the reticulation. In one of the paratypes the pronotum is nearly completely covered with isodiametric reticulation.

DISTRIBUTION. Known from the type locality, Medan in Sumatra.


Sweden, Stockholm, Naturhistoriska riksmuseet


Swedish Museum of Natural History, Entomology Collections














Clivina trachys Andrewes, 1930

Balkenohl, Michael 2021

Clivina trachys ANDREWES, 1930a: 1

BALKENOHL M. 2001: 16
LORENZ W. 1998: 134
CSIKI E. 1933: 639
ANDREWES H. E. 1930: 1
2005: 144
GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF