Compsibidion amboroensis, Santos-Silva & Galileo & Wappes, 2017

Santos-Silva, Antonio, Galileo, Maria Helena M. & Wappes, James E., 2017, Descriptions, notes and reassignments in Neoibidionini (Coleoptera: Cerambycidae: Cerambycinae) with a new genus, three new species and keys to species of Brechmoidion Martins, 1969, Compsibidion Thomson, 1864 and Rhysium Pascoe, 1866, Insecta Mundi 2017 (560), pp. 1-21 : 5-6

Compsibidion amboroensis sp. nov.

( Fig. 12–17 )

Description. Holotype female. Head and prothorax dark brown, more reddish brown in gular area; palpi light reddish brown; antennae reddish brown; ventral side of meso- and metathorax dark reddish brown, gradually lighter toward apex of metasternum; legs reddish brown, darker on some areas; abdominal ventrites mostly reddish brown; elytra dark brown in basal half, gradually reddish brown toward apex, except irregular, somewhat transverse yellow spot medially. Pubescence and erect setae yellowish white (more grayish depending on angle of light source).

Head. Frons finely, abundantly, confluently punctate, more so toward antennal tubercles; laterally separated from antennal tubercles by deep depression; pubescence not obscuring integument. Area between antennal tubercles and with narrow carina on each side of coronal suture, gradually divergent, less distinct toward posterior edge of upper eye lobes, then confluent toward prothoracic margin; coronal suture gradually more distinct from between antennal tubercles and apex of lateral carinae; area between carinae moderately coarsely, abundantly punctate; remaining surface of vertex nearly smooth; pubescence on vertex not obscuring integument. Surface behind upper eye lobes nearly smooth and glabrous; area behind lower eye lobes finely punctate and with long, erect setae close to eye, smooth, glabrous toward prothorax. Antennal tubercles finely, abundantly punctate; pubescence not obscuring integument, slightly denser toward apex. Genae minutely punctate, close to eye interspersed with coarser punctures toward smooth apex; pubescence not obscuring integument, interspersed with long, erect setae. Postclypeus finely rugose-punctate in large central area, smooth laterally; with sparse pubescence in rugose-punctate area, glabrous laterally; with one long, erect seta on each side of rugosepunctate area. Labrum coplanar with anteclypeus basally and laterally, distinctly concave in center of distal area; glabrous in coplanar area, with short and long setae in concave area. Distance between upper eye lobes 0.55 times length of scape; distance between lower eye lobes 0.80 times length of scape; upper eye lobes with 5 rows of ommatidia. Antennae 1.65 times elytral length, reaching elytral apex near apex of antennomere IX. Scape gradually widened toward apex, arched in side view; with some long, erect setae throughout. Antennomeres not carinate. Antennomeres III–VII/III–VIII with long, erect setae ventrally (gradually sparser toward VII/VIII). Antennal formula (ratio) based on length of antennomere III: scape = 0.69; pedicel = 0.19; IV = 0.71; V = 0.82; VI = 0.85; VII = 0.84; VIII = 0.73; IX = 0.72; X = 0.62; XI = 0.50.

Thorax. Prothorax subcylindrical, 1.2 times longer than wide, basal constriction distinct and distal constriction absent. Pronotum with five barely visible gibbosities (one on each side of basal quarter; one on each side slightly behind midlength; one centrally elongated, less distinct); surface nearly smooth; sparsely pubescent (primarily in anterior central region), except in central area between lateral gibbosities, interspersed with long, erect setae. Sides of prothorax sparsely pubescent, interspersed with long, erect, sparse setae, nearly glabrous toward ventral side; surface smooth centrally, striate and interspersed with fine, sparse punctures near anterior margin. Prosternum smooth in basal half, transversely striate in distal half; with sparse pubescence, slightly more abundant in basal half (forming slightly distinct V-shaped pubescent area). Central constriction of prosternal process 0.20 times width of procoxal cavity. Mesosternum nearly glabrous centrally, pubescent laterally (pubescence not obscuring integument). Metepisternum and lateral sides of metasternum with pubescence moderately abundant, but not obscuring integument, gradually glabrous toward central region; with long, erect, sparse setae, except near longitudinal sulcus. Scutellum centrally depressed, with pubescence not obscuring integument.

Elytra. Coarsely, sparsely punctate in basal half, gradually finer, denser toward apex; basal half with sparse, decumbent minute setae, gradually denser toward apex, more so laterally; with short, suberect, very sparse setae throughout; apex rounded; sides slightly, gradually widened from humerus to apical fifth.

Legs. Femora pedunculate-clavate; pubescence not obscuring integument, interspersed with long, erect setae. Tibiae not longitudinally carinate. Metatarsomere Islightly longer than II–III together.

Abdomen. Ventrites with abundant pubescence, not obscuring integument, interspersed with long, erect setae, denser laterally and on ventrite V; apex of ventrite Vslightly rounded.

Dimensions (holotype female). Total length 15.00; prothorax: length 2.85; anterior width 2.15; posterior width 2.15; max. prothoracic width 2.35; humeral width 3.10; elytral length 9.90.

Type material. Holotype female from BOLIVIA, Santa Cruz: Amboro Road, above Achira Campo (5,000 -5,800 ’), 9-11.X.2004, Wappes & Morris col. ( MNKM).

Etymology. Named for Amboro National Park, where the holotype and only known specimen was collected along an old logging road entering the park.

Remarks. Compsibidion amboroensis sp. nov. is similar to, but differs from, C. inflatum as follows: prothorax without distal constriction, central area not widened laterally and shorter and wider than in C. inflatum ; elytra with very sparse erect setae; antennomere XI distinctly shorter than X. In C. inflatum (female) the prothorax has a distinct anterior constriction, with central region widened laterally, and is longer and narrower than in C. amboroensis ; the elytra have erect setae distinctly more abundant; and antennomere XI is longer than X. See remarks for Compsibidion achiraensis sp. nov.

Figures

Figures 12–18. New species of Compsibidion. 12–17, Compsibidion amboroensis sp. nov. 12) Dorsal habitus. 13) Ventral habitus. 14) Lateral habitus. 15) Head, frontal view. 16) Head and scape, dorsal view. 17) Eye, frontal view. 18, Compsibidion achiraensis sp. nov.: holotype female, eye, frontal view.