Plocaederus mirim Martins and Monné, 2002

Wappes, James E., Santos-Silva, Antonio & Botero, Juan Pablo, 2018, Description of a new species of Ochraethes Chevrolat, 1860, redescription of Plocaederus mirim Martins and Monné, 2002, and new geographical records for Plocaederus Dejean, 1835 (Coleoptera, Cerambycidae, Cerambycinae), Insecta Mundi 609, pp. 1-8 : 3-5

Plocaederus mirim Martins and Monné, 2002

( Fig. 6–15 )

Redescription. Male ( Fig. 6–14 ). Integument mostly black; mouthparts yellowish-brown, yellower at apex of basal palpomeres; antennae increasingly reddish brown toward distal segments; elytra orange brown with humerus and along epipleural margins darker; tibiae gradually darker brown toward apex; tarsomeres brown.

Head. Frontal plate of frons moderately coarsely, confluently punctate, more so along central area; remaining surface finely rugose-punctate with low, rounded carina laterally from antennal tubercles to clypeus (widened toward clypeus); with minute, sparse grayish white setae, sparser on frontal plate. Area between antennal tubercles distinctly depressed centrally along median groove, tumid laterally; tumid area finely, abundantly punctate, with minute, sparse grayish white setae. Area between upper eye lobes carina-shaped centrally, forming gibbosity toward antennal tubercles, but flattened toward distal margins, confluently punctate close to eyes; with minute, sparse grayish white setae close to eyes. Remaining surface of vertex close to eyes nearly smooth, finely rugose toward prothoracic margin; rugose area with minute, sparse grayish white setae. Area behind upper eye lobes finely rugose-punctate; area behind lower eye lobes finely, transversely striate, with fine punctures interspersed, except smooth area close to eye; entire surface nearly glabrous. Genae finely, abundantly punctate toward dorsal surface, coarser toward ventral side, smooth near apex; with minute, sparse grayish white setae. Postclypeus finely, abundantly punctate on wide central area (less so centrally), smooth laterally; with minute, sparse grayish white setae, with long, erect yellowish setae interspersed laterally. Labrum coplanar with anteclypeus at basal half, inclined at distal half; finely, sparsely punctate on basal half; with a few minute grayish white setae interspersed with long, thick, erect yellowish setae on basal area, with fringe of yellowish setae distally. Antennal tubercles smooth, glabrous, except frontal surface finely punctate and minute, sparse grayish white setae basally. Median groove distinct only between antennal tubercles and upper eye lobes. Distance between upper eye lobes 0.14 times length of scape; in frontal view, distance between lower eye lobes 0.83 times length of scape. Antennae 2.5 times elytral length, reaching elytral apex at basal area of antennomere VIII. Scape coarsely, densely punctate, except smooth distal area, with distinct, narrow, transverse cicatrix near apex ( Fig. 11 ); with minute, sparse yellowish white setae. Antennomere III slightly widened distally (apex nodose), sensorial area occupying small distal area; antennomeres IV–X slightly expanded distally (more so in IV), with outer apex angular, obtusely in IV, acutely from V; sensorial area of antennomere IV occupying distal fourth; sensorial area of antennomere V occupying distal half; sensorial area of remaining antennomeres complete from base to apex. Antennal formula (ratio) based on antennomere III: scape = 0.61; pedicel = 0.15; IV = 0.69; V = 0.93; VI = 0.88; VII = 0.91; VIII = 0.85; IX = 0.85; X = 0.86; XI = 1.27.

Thorax. Prothorax 1.1 times wider than long (including lateral tubercles); lateral tubercle placed at about middle, apex blunt; sides irregular, slightly convergent from lateral tubercle toward distal constriction, parallel-sided from base to lateral tubercle. Pronotum coarsely, transversely striate except for narrow band adjacent to basal and distal margins; finely, abundantly punctate; with minute, sparse grayish white setae throughout, slightly denser basally. Sides of prothorax rugose-punctate on wide central area, nearly smooth on basal and distal areas; with minute, sparse grayish white setae. Prosternum with two transverse sulci, one at about middle, another near distal area; area between procoxal cavities and middle sulci finely, abundantly punctate; area between sulci and between distal sulci and distal margin finely rugosely-punctate; with sparse white pubescence not obscuring integument. Distal area of prosternal process forming distinct rounded tubercle. Ventral side of meso- and metathorax with white pubescence not obscuring integument. Mesoventral process deeply emarginate at apex, not tuberculate dorsally. Scutellum with white pubescence not obscuring integument. Elytra. Coarsely, densely punctate, gradually finer toward apex; apex obliquely truncate, unarmed; with white pubescence not obscuring integument. Legs. Femora densely punctate, distinctly coarser on profemora; with white pubescence not obscuring integument; pro- and mesofemora fusiform; metafemora subcylindrical. Tibiae with yellowish white pubescence not obscuring integument on basal half, gradually with longer, brownish yellow, dense pubescence toward apex of ventral side.

Abdomen. Ventrites finely, abundantly punctate; with white pubescence not obscuring integument; apex of ventrite V sub-truncate.

Description. Female ( Fig. 15 ). It differs from males by the shorter antennae (1.3 times elytral length, reaching elytral apex at basal third of antennomere IX).

Dimensions in mm (holotype male/ males/ females). Total length, 11.20/14.10–15.20/13.20; prothoracic length, 2.40/3.00–3.25/2.80; basal prothoracic width, 2.30/2.85–3.00/2.50; distal prothoracic width, 2.05/2.50–2.75/2.30; widest prothoracic width (between apices of lateral tubercles), 2.80/3.45–3.70/3.10; humeral width, 3.00/3.80–4.05/3.55; elytral length, 6.90/8.80–9.45/7.75.

Material examined. BRAZIL, Amazonas (Rio Urubu, Rodovia AM010, Km 246), holotype male, 12–14.

VII.1982, Penny, Arias & Adams col, “ Armadilla de luz negra) ( INPA). FRENCH GUIANA: Road to Kaw (pk 31), 2 males, 1 female, 23–25.VIII.1995, J. E. Wappes col. (1 male, 1 female, ACMT; 1 male, MZSP) .

Remarks. The two males from French Guiana have the antennae 2.5 times longer than elytra and the scape is slightly longer than twice its distal width. In the holotype male ( Fig. 6–9 ), the antennae are 2.2 times longer than elytra and the scape is shorter than twice its distal width. However, as no other differences were found between the three males examined, these small differences may simply be the result of the smaller size of the holotype. As the original description of P. mirim was based on a single small male, we are re-describing the male, based on the two larger males from French Guiana, as well as detailing the only reliable difference found between the sexes.

Figures

Figures 6–15. Plocaederus mirim. 6–9, holotype male. 6) Dorsal habitus. 7) Ventral habitus. 8) Lateral habitus. 9) Head, frontal view. 10–14, Male. 10) Head, frontal view. 11) Scape showing apical cicatrix. 12) Dorsal habitus. 13) Ventral habitus. 14) Lateral habitus. 15) Female, dorsal habitus.