Trachelissa opaca, Quintino, Hingrid Yara S. & Monné, Marcela L., 2014

Quintino, Hingrid Yara S. & Monné, Marcela L., 2014, Revision of Trachelissa Aurivillius, 1912 (Insecta: Coleoptera: Cerambycidae), Zootaxa 3793 (5), pp. 501-537 : 519-520

Trachelissa opaca sp. nov.

( Figs 64–76 , 106–113 , 137–140 , 157 , 160 )

Male. Head brownish orange with black longitudinal spots on vertex and behind eyes; submentum black. Mandibles bicolored, brownish yellow with dark-brown apex. Scape and pedicel black; antennomeres III–VIII, basal 2/3 brownish orange and apical third black; antennomeres IX–XI, basal 2/3 brownish red. Pronotum brownish red with six rounded black spots, forming two groups separated by a median longitudinal black band; sides of prothorax with two pairs of black spots; prosternum and metepisternum black; prosternal process and mesosternum brownish orange; mesepisternum dark brown; mesepimeron bicolored, brownish orange and black; metasternum dark brown with two brownish-orange spots in anterior half. Elytra brownish yellow on anterior half and with dark-brown spots on posterior half. Procoxae and mesocoxae bicolored, brownish orange and black; peduncle of femora brownish orange and club dark brown; tibiae and tarsi brownish orange. Abdomen brownish red.

Frons with whitish and yellowish setae. Vertex with fine dense punctures; short, dense yellowish setae. Antennal tubercle with smooth and glabrous apices. Dorsal region of head with fine, moderately sparse punctures. Genae and around the eyes with long whitish setae. Upper eye lobes well separated, distance between them about three times width of upper lobe; lower eye lobes about three times wider than upper lobes. Genae measuring 1/3 of diameter of lower eye lobes; short, dense yellowish setae.

Antennae reaching the elytra apices at antennomere X. Pedicel and antennomeres III–XII with fine shallow dense punctures; short dense yellowish setae; apices of antennomeres III–XI smooth and glabrous; antennomere III with longitudinal groove; antennomere IV not grooved; apical antennomeres filiform; antennomere III about 1.5 times length of scape and subequal in length to IV; antennomeres IV–XI gradually decreasing; antennomere XII about 1/3 shorter than III and 2/3 shorter than XI.

Prothorax with matte surface; prothorax rounded at sides, with two pairs of shallow tubercles, one pair antemedian and the other postmedian; pronotum opaque and microsculptured throughout except on two black rounded tubercles near posterior margin. Pronotum ( Fig. 106 ) with fine dense sexually dimorphic punctation, except in a median smooth longitudinal band, on the rounded tubercles, in the elevated region on the prothorax and in the tubercles at the sides of the prothorax, which have a shiny surface with fine sparse punctures. Sexual punctation with deeper, irregular punctures ( Fig. 107 ); each indentation with two or five groups of pores distributed entirely within indentations ( Fig. 108 ); between indentations are setigerous punctures ( Fig. 109 ). Prosternum with sexually dimorphic punctation denser than pronotum and matte surface, with long whitish setae. Prosternal process narrowed at base, expanded in middle and acuminate to apex. Mesosternum depressed. Scutellum glabrous.

Elytra with fine dense punctures, some evident; glabrous; four longitudinal lines; apices rounded. Sternites I–IV gradually decreasing in length; sternite V with sinuous apical margin.

Terminalia: Sternite VIII ( Fig. 64 ) with sinuous apical margin, lateral margin rounded; sternal apophysis long, subequal to greatest length of sternite. Tergite VIII ( Fig. 65 ) with apical margin rounded and adorned with long setae. Ventral arc ( Fig. 66 ) with apophysis length subequal to arms. Dorsal arc ( Fig. 67 ) with apical margin rounded. Tegmen ( Figs 68–70 ) shorter than median lobe; ring piece ovate. Median lobe ( Figs 71–73 ): ventral lobe subequal to dorsal lobe in length; both with acuminate apices; basal apophysis twice longer than apical region. Internal sac with two sclerotized “C”-shaped pieces.

Female. Head brownish yellow with longitudinal dark-brown spot on vertex and rounded dark-brown spots behind eyes. Scape and pedicel black; antennomeres III–VI bicolored, brownish red with dark-brown apices; antennomeres VII–XI dark brown. Pronotum brownish red with six rounded black spots, forming two groups separated by a median longitudinal black band; sides of prothorax with two pairs of black spots.

Antennae exceeding elytral apices by at most two antennomeres; outer margin of antennomeres, in females, slightly expanding to apex, more evident in antennomeres III–V; antennomeres III–VII with smooth and glabrous apices; antennomeres IV–VI subequal in length, VII–X gradually shorter; antennomere XI about half length of III and subequal to X in length. Prothorax with very shiny surface, not microsculptured and opaque; pronotum and sides of prothorax with smooth surface, with fine shallow sparse punctures. Prosternum with denser punctures; long suberect whitish setae. Sternite V with apical margin slightly sinuous.

Terminalia: Sternite VIII ( Fig. 110 ) about 2.5 times wider than long; sternal apophysis two times longer than greatest length of sternite; lateral margin with long dense setae; intermediate region between brush of setae and apophysis with very short setae ( Fig. 111 ), moderately dense. Ovipositor ( Figs 75, 76 ) with wide vulva; spermathecal gland as long as spermatheca.

Variability. Head and pronotum with brownish-red to almost entirely dark-brown spots. Elytra in males, almost entirely brownish yellow with two continuous lines, evident on anterior half or entire elytra ( Figs 137, 138 ); in females, varying from brownish yellow with dark-brown spots to almost entirely black with two longitudinal brownish-red spots in median region.

Measurements (mm). male/female n= 2/2. Total length 9.6–10.4/10.2; prothorax length 2–2.3/2; greatest prothorax width 2–2.2/2; elytral length 6.2–6.8/6.2–7.2; humeral width 2.4–2.6/2.7.

Type material. Holotype male. ARGENTINA. Córdoba: Huerta Grande, male, XII.1952, H. Foerster leg. ( MNRJ). Paratypes: Córdoba: 3 males ( MNRJ); Anisacate, female ( MNRJ); Santa Fé: Santo Tomé, male and 2 females, 22.X.1952, Bosq leg. ( MNRJ); Santa Fé, 3 females ( MNRJ); Mendoza, female ( MNRJ).

Etymology. The specific epithet is a derivative of the Latin word opaca (= opaque) referring to the opaque appearance of the pronotum.

Comments. Trachelissa opaca sp. nov. differs from the other species of the genus by the following characters: the prothorax surface, in male, with matte sexually dimorphic indentation, contrasting with the rest of the body, with very fine dense punctures on the elytra in both sexes. In females, the prothorax has a shiny surface as in the other species; the color pattern may be confused with T. maculicollis , but the apical antennomeres of females of T. opaca sp. nov. are less serrate than those of females of T. maculicollis . In T. opaca sp. nov. the base of the tegmen is ovate, as in T. maculicollis . The ovipositor in T. opaca sp. nov. is similar to that of T. pustulata in external morphology, and differs in the shorter and more slender apodemes.

Geographical distribution. Recorded from Argentina (Córdoba, Santa Fé) ( Figs 157 , 160 ).

Figures

FIGURE 157. Map of geographical distribution of Trachelissa Aurivillius, 1912.

FIGURES 64 – 73. Trachelissa opaca sp. nov., male. 64, sternite VIII; 65, tergite VIII; 66, ventral arc; 67, dorsal arc; 68 – 70, tegmen: 68, dorsal view, 69, lateral view, 70, ventral view; 71 – 73, median lobe: 71, dorsal view, 72, lateral view, 73, ventral view.

FIGURES 74 – 76. Trachelissa opaca sp. nov., female. 74, tergite VIII; 75 – 76, ovipositor: 75, dorsal view, 76, ventral view.

FIGURES 106 – 113. Trachelissa opaca sp. nov. 106 – 109, pronotum, male: 106, general view, 107 detail of microsculptured surface and of indentations of the sexual punctation, 108, detail of indentation with pores, 109, detail of indentation with setae; 110 – 113, sternite VIII, female: 110, general view, 111, detail of median region with setae, 112, detail of aciculate and conchoidal setae, 113, detail of petiolate setae.

FIGURES 137 – 140. Trachelissa opaca sp. nov. 137 – 138, males, 139 – 140, females.

FIGURES 158 – 161. Maps of geographical distributions. 158, Trachelissa pustulata; 159, T. rugosipennis; 160, Trachelissa bella sp. nov. and Trachelissa opaca sp. nov.; 161, T. maculicollis.