Microibidion bimaculatum, Mehl, Ole, Galileo, Maria Helena M., Martins, Ubirajara R. & Santos-Silva, Antonio, 2015

Mehl, Ole, Galileo, Maria Helena M., Martins, Ubirajara R. & Santos-Silva, Antonio, 2015, Four new species of Cerambycidae (Coleoptera) from Paraguay, ZooKeys 507, pp. 31-40 : 34-36

Taxon classification Animalia Coleoptera Cerambycidae

Microibidion bimaculatum sp. n. Figs 12, 13, 14, 15

Description.

Male. Integument dark-brown, except for: palpi reddish; large, yellowish, sub-rounded spot on each elytron near middle, not reaching lateral side and suture.

Head. Frons transverse, coarse, abundantly, confluently punctate; pubescence yellowish, sparse, absent on narrow band around coronal suture. Antennal tubercles elevated, with sculpture and pubescence as on frons. Coronal suture distinct from clypeus to about anterior edge of eyes. Vertex moderately fine, densely, confluently punctate; pubescence sparser than on frons. Area behind eyes coarse, sparsely punctate; pubescence very sparse. Genae fine, abundantly punctate, with sparse short setae. Distance between upper eye lobes equal to 0.60 times the length of scape; distance between lower eye lobes, in frontal view, equal to 0.85 times the length of scape. Antennae as long as 1.8 times the elytral length; reaching elytral apex about apex antennomere IX; scape, pedicel and antennomeres with withish-yellow pubescence; antennomeres VII–XI somewhat curved (mainly VII–VIII); antennal formula based on antennomere III: scape = 0.76; pedicel = 0.28; IV = 0.67; V = 0.88; VI = 0.88; VII = 0.88; VIII = 0.85; IX = 0.82; X = 0.73; XI = 0.79.

Thorax. Prothorax narrower at base than anteriorly; with constriction at middle of basal half. Pronotum moderately coarse, sparsely punctate; disc with three small tubercles about middle (central more conspicuous); pubescence moderately yellowish, sparse, except for three large longitudinal glabrous areas (central longest). Lateral side of prothorax sparsely punctate; with short, very sparse setae. Pubescence on metepisterna and metasternum abundant, but not dense. Scutellum with dense, yellowish pubescence. Elytra: moderately coarse, abundantly punctate; nearly all punctures with small, fine setae; with sparse, thick, yellow, moderately long setae, somewhat aligned in three rows on basal two-thirds; apex individually rounded. Legs: pubescence on femora yellowish-brown, distinctly not obliterating integument.

Abdomen. Ventrites with pubescence as on lateral side of metasternum. Ventrite V about as long as IV; apex truncate.

Paratype female. Antennae as long as 1.5 times elytral length; slightly surpassing elytral apex. Ventrite V trapezoidal; about as long as IV; apex rounded.

Type material.

Holotype male: PARAGUAY, Presidente Hayes: Lolita (Laguna Yaragui, 59°37'W, 23°05'S), I.2005, U. Drechsel col. (MZSP). Paratype female: PARAGUAY, Alto Parana: Estancia Dimas (55°13'W, 25 33'S), II.2005, U. Drechsel col. (MZSP).

Dimensions in mm (male/female).

Total length, 5.70/6.60; length of prothorax at center, 1.20/1.30; anterior width of prothorax, 0.85/0.95; posterior width of prothorax, 0.75/0.85; humeral width, 1.15/1.30; elytral length, 3.70/4.10.

Etymology.

Latin, bi = two; maculatus = spotted. Relating to the two spots on elytra.

Remarks.

Microibidion bimaculatum sp. n. is similar to Microibidion exculptum Martins, 1962, but differs as follows: antennae dark-brown; antennomeres somewhat thicker in both sexes; antennomeres X and XI about as long as IV; basal antennomeres without long, sparse setae on ventral side; thick setae on basal two-thirds of elytra aligned in three rows. In Microibidion exculptum (Fig. 16) the antennae are reddish, the antennomeres are slender, antennomeres X and XI are shorter than IV, the basal antennomeres have long, sparse setae on ventral side, and the thick setae on basal two-thirds of elytra are aligned in 4/5 rows.

Microibidion bimaculatum can be included in the alternative of couplet “3”, from Martins (2009) (translated):