Nyssodrysilla humeralis Bezark and Santos-Silva, 2023

Bezark, Larry G. & Santos-Silva, Antonio, 2023, New species, synonymies and transfers in Neotropical Lamiinae (Coleoptera: Cerambycidae), Insecta Mundi 2023 (993), pp. 1-26 : 2-4

Nyssodrysilla humeralis Bezark and Santos-Silva , new species

( Fig. 1–5 )

Description. Holotype female. Integument mostly blackish; ventral mouthparts dark brown, except yellowish apex of maxillary palpomere IV and apex of labial palpomere III; anteclypeus dark brown except large, subquadrate pale yellowish-brown macula on each side, fused by narrow band of same color close to posterior margin of segment; labrum brown on posterior 2/3, slightly lighter on posterocentral region, yellowish brown on anterior third. Elytra with large, subtriangular brown macula on each side of basal fifth, more orangish-yellow on humerus.

Head. Frons densely, finely punctate; with abundant grayish-white pubescence partially obscuring integument, except mostly glabrous median groove; with one long, erect black seta close to each eye. Vertex and area behind upper eye lobes with abundant whitish pubescence almost obscuring integument, except glabrous area close to prothorax, glabrous median groove, and glabrous, sub diamond-shaped central area between antennal tubercles and upper eye lobes. Area behind lower eye lobes with abundant whitish pubescence close to eye, pubescence denser from superior third, glabrous close to prothorax. Genae with somewhat abundant whitish pubescence not obscuring integument, except glabrous apex and area close to frons and clypeus; with a few long, erect black setae interspersed. Antennal tubercles with pubescence as on frons frontally, slightly sparser posteriorly. Wide central area of postclypeus with abundant grayish-white pubescence partially obscuring integument (pubescence whiter depending on light intensity), except glabrous central area and long, erect, both dark-brown and yellowish-brown setae interspersed. Sides of postclypeus glabrous. Labrum with somewhat abundant grayish-white pubescence not obscuring integument on posterior 2/3, with long, erect dark-brown setae interspersed, glabrous on anterior third, except fringe of pale yellow setae on anterior margin. Gulamentum glabrous except moderately abundant grayish-white pubescence anteriorly and a few long, erect dark-brown setae interspersed on pubescence. Distance between upper eye lobes 0.20 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.57 times distance between outer margins of eyes. Antennae 2.90 times elytral length, reaching elytral apex at basal quarter of antennomere VI. Scape with somewhat sparse brownish pubescence dorsally, and abundant grayish-white pubescence not obscuring integument on remaining surface; with a few long, erect blackish setae near apex of ventral surface. Pedicel with brownish pubescence not obscuring integument dorsally and on superior area of sides, and grayish-white pubescence not obscuring integument on remaining surface; ventral surface with a few long, erect, thick blackish setae. Antennomeres III–XI with abundant dark-brown pubescence, with grayish-white pubescence on some areas of III–IV, short, decumbent grayish-white setae interspersed on V–XI, and somewhat abundant, short, bristly dark-brown setae interspersed from VI; with short, erect, thick black setae interspersed ventrally on III–VI, short, thick black setae interspersed dorsally on III–IX, distinctly sparser on IX. Antennal formula based on length of antennomere III: scape = 0.92; pedicel = 0.12; IV = 0.97; V = 0.87; VI = 0.84; VII = 0.76; VIII = 0.81; IX = 0.79; X = 0.73; XI = 0.76.

Thorax. Prothorax wider than long; anterior constriction narrow, well marked; sides gradually divergent from anterolateral angles to lateral tubercles, then convergent toward posterolateral angles; lateral tubercles located on posterior quarter, with acute apex slightly directed backward and upward. Pronotum densely, finely punctate; with transverse row of coarse punctures posteriorly, bifurcated laterally with punctures following toward lateral tubercles and punctures following toward sides of prothorax; with one coarse puncture on each side of posterior third; mostly with abundant grayish-white pubescence not obscuring integument, slightly denser on longitudinal band on each side, with yellow pubescence interspersed on superior region of longitudinal band; central area with moderately dense, longitudinal, irregular pubescent band, from anterior constriction to near posterior margin, except central area of this band with abundant yellow pubescence, anteriorly projected toward anterior quarter of pronotum, forming irregular Y-shaped macula; with two irregular maculae with sparse brownish pubescence on each side between central pubescent band and lateral pubescent band, one on anterior half, another on posterior half; apex of brownish pubescent maculae with yellowish pubescence; anterior and posterior sulci glabrous; with a few long, erect black setae laterally near posterior margin. Sides of prothorax densely, finely punctate, with a few coarse, shallow punctures interspersed, except coarse posterior punctures; with abundant grayish-white pubescence partially obscuring integument, except glabrous anterior and posterior transverse sulci. Ventral surface of thorax with abundant grayish-white pubescence partially obscuring integument; prosternal process strongly narrowed centrally, with its narrowest area 0.18 times procoxal width; sides of mesoventral process convergent on anterior half, parallel-sided on posterior half, with posterior margin emarginate centrally and 0.61 times mesocoxal width. Scutellum with abundant grayish-white pubescence not obscuring integument. Elytra. Sides slightly widened centrally; apex truncate with outer angle slightly projected; coarsely, somewhat abundantly punctate on anterior quarter, punctures gradually finer and sparser toward apex on remaining surface; with abundant grayish-white pubescence partially obscuring integument, more grayish-brown on large dorsal area on anterior half; with dense, large, subtriangular orangish-yellow pubescent macula on sides of anterior third, not reaching humerus and epipleural margin. Legs. With abundant grayish-white pubescence almost obscuring integument, except: small, glabrous areas surrounding tibial punctures; dark-brown pubescence on dorsal surface of posterior third of mesotibiae; dark-brown pubescence on most of ventral surface of protibiae; and brownish pubescence on posterior quarter of ventral surface of meso- and metatibiae. Meso- and metatibiae with short, erect, thick black setae interspersed. Metatarsomere I longer than II–III together.

Abdomen. Ventrites with abundant grayish-white pubescence partially obscuring integument, except glabrous central apex of ventrites 1–4 and sparser pubescence on posterior quarter of ventrite 5. Ventrite 5 about as long as 3–4 together; sides strongly convergent on anterior third, parallel-sided on posterior third; apex widely emarginate; with long dark-brown setae directed backward on apex. Last tergite triangular apically and surpassing apex of ventrite 5.

Dimensions (mm). Total length, 7.20; prothoracic length, 1.05; anterior prothoracic width, 1.25; posterior prothoracic width, 1.40; maximum prothoracic width, 1.75; humeral width, 2.15; elytral length, 4.90.

Type material. Holotype female from PARAGUAY, Amambay: Camp Chacurru [Chacurru Ecoturismo], 10 km S Pedro Juan Caballero, 9.XI.2018, W.H. and R.W. Tyson leg. ( CASC, formerly WHTC).

Etymology. The specific epithet refers to the orangish-yellow macula present on the elytral base.

Remarks. Nyssodrysilla humeralis new species differs from the other species of the genus by the yellow pubescent maculae on anterior sides of the elytra (absent in the other species).

Figures

Figures 1–5. Nyssodrysilla humeralis new species, holotype female. 1) Dorsal habitus. 2) Ventral habitus. 3) Lateral habitus. 4) Head, frontal view. 5) Left antenna and, left profemora, protibiae, protarsus, and metatarsus.