Urgleptes curvatum, Nascimento & Heffern, 2018

Nascimento, Francisco E. De L. & Heffern, Daniel, 2018, New species of Acanthocinini Blanchard, 1845 (Coleoptera, Cerambycidae) from Rondônia state, Brazil and notes on some genera, Zootaxa 4446 (2), pp. 292-300 : 297-299

Urgleptes curvatum sp. nov.

( Figs. 13–16 )

Holotype male. Integument yellowish: mouthparts, prosternum, mesoventrite, central area of metaventrite, abdominal ventrites, coxae and proximal half of legs. Head, mesanepisternum, mesepimeron and metanepisternum darkened; central area of pronotum, femoral clubs, tibiae, and tarsomeres brownish.

Head. Frons wider than long; finely, inconspicuously punctate; with yellowish pubescence not obscuring integument; remaining surface less pubescent. Antennal tubercles slightly, gradually elevated from median groove. Lower eye lobes about 1.25 times as long as genal length. Frontoclypeal suture and distal half of labrum with subdecumbent, elongated yellowish setae. Labrum with transverse row of dark-brown erect setae. Mandibles triangularly depressed, darkened toward apex. Labial and maxillary palpomere IV fusiform. Upper eye lobes with five rows of ommatidia; distance between upper eye lobes about 3.5 times width of an upper lobe. Antennae about twice body length; reaching elytral apex at middle-length of antennomere VI; flagellomeres with short, blackened, thick setae sparsely distributed at inner side (especially at apex); remaining surface with sparse yellowish pubescence; scape gradually widened toward apex, slightly sinuous at distal half, brownish at proximal half, gradually blackish toward apex; flagellomere IV light brown, blackish toward apex; remains flagellomeres brownish, slightly blackened toward apex; antennal formula (ratio) based on length of antennomere III: scape = 1.06; pedicel =0.10; IV = 0.98; V = 0.90; VI = 0.84; VII = 0.86; VIII =1.04; IX = 1.08; X = 1.26; XI = 1.54.

Thorax. Prothorax 1.5 times wider than long; sides with tubercle projected at posterior third. Pronotum flattened; sparsely punctate, with transverse row of punctures at posterior fifth; central area with sub-cordiform brownish pubescent maculae; remaining surface with yellowish pubescence evenly distributed. Prosternum with sparse yellowish pubescence; prosternal process laminar at middle. procoxal cavities occupying 0.8 times prosternum length; closed behind. Meso- and metaventrite with moderate yellowish pubescence, not obscuring integument; mesoventral process about 0.2 times mesocoxal cavity diameter. Scutellum about twice wider than long, rounded posteriorly. Elytra. Length about 3.5 times prothoracic length; posterior half slightly convergent toward apex; apex obliquely truncated; surface moderately coarsely punctate, punctures evenly distributed throughout. Yellowish pubescent area as follows: broad, longitudinal band dorsally, sinuous from base to about middle, then distinctly curved toward side and gradually narrowed toward distal third of elytron; narrow band along suture, from scutellum to about distal third, then distinctly widened, almost reaching apex, with narrow projection toward epipleura near its apex, and projection toward longitudinal band at base of widened area. Remaining elytral surface with brownish pubescence. Legs with moderately abundant whitish pubescence; pro- and mesofemora strongly pedunculate-clavate; metafemora slightly clavate, club less broad than pro- and mesofemoral club; tibiae with proximal half brownish, gradually darker towards apex; mesotibiae with crest of thick blackish setae at distal third. Metatarsomere I longer than II + III.

Abdomen with sparse whitish pubescence; abdominal ventrites I–IV yellowish; V brownish. Ventrite I length, from intercoxal process, about 2.5 length of II; II–IV slightly decreasing in length; V length about 1.5 times length of IV, with apex truncate.

Dimensions (in mm), holotype male. Total length, 5.20; prothorax length, 1.00; greatest width of prothorax, 1.50; anterior width of prothorax, 1.10; posterior width of prothorax, 1.20; humeral width, 1.15; elytral length, 3.60.

Type material. Holotype male from BRAZIL, Rondônia: Ariquemes (62 Km SW), 6–12.X.1993, C.W. & L.O’Brien col. ( MZSP).

Etymology. The name refers to the sinuous area of yellowish pubescence of the elytra.

Remarks. The pubescent pattern of Urgleptes curvatum sp. nov. is similar to that in Nyssodrysina pulchella , but differs especially by the row of transverse punctures on pronotum extending behind the lateral spines (diagnostic feature of Urgleptes ). Among its congeneric species, U. curvatum sp. nov. is similar to U. bicoloratus Gilmour, 1960 by the pubescence pattern of the pronotum and U. sinuosus Gilmour 1960 by the elytral pubescence pattern. The new species differs from U. bicoloratus primarily by the darkened color of the head ( Fig. 13 ) and the posterior half of the elytra non-blackened ( Fig. 14 ). In Urgleptes bicoloratus , the head is not darkened (concolorous with the remaining coloration of the body), and the posterior half of the elytra is darkened. It differs from U. sinuosus mainly by the pronotal disc with sub-cordiform brownish pubescence and apical quarter of the elytra with a widened area of yellowish pubescence, with narrow projection toward epipleura. Urgleptes sinuosus has a circular area of yellowish pubescence at pronotal disc and the apical quarter of elytra has irregular yellowish pubescence areas. Moreover, U. sinuosus is recorded only from Central America ( Guatemala, Honduras).

Figures

FIGURES 9–16. 9–12, Nyssodrysina maculosa sp. nov., holotype, male: 9, dorsal view; 10, ventral view; 11, lateral view; 12, frontal view. 13–16, Urgleptes curvatum sp. nov., holotype, male: 13, frontal view; 14, dorsal view; 15, ventral view; 16, lateral view.