Euderces lineatus, Bezark & Santos-Silva, 2022

Bezark, Larry G. & Santos-Silva, Antonio, 2022, A new genus and new species of Neotropical Cerambycinae (Coleoptera, Cerambycidae), Zootaxa 5194 (4), pp. 585-594 : 591-594

Euderces lineatus sp. nov.

( Figs 16–22 )

Description. Holotype male ( Figs 16–20 ). Head capsule reddish brown dorsally and laterally, lighter ventrally; ventral mouthparts mostly light reddish brown, except yellowish apex of palpomeres; scape mostly reddish brown with some areas more brownish; pedicel dark brown basally, reddish brown on remaining surface; antennomere III dark reddish brown basally and apically, dark brown on remaining surface; antennomeres IV–XI dark brown. Prothorax reddish brown dorsally, gradually orangish brown toward ventral surface, except brown anterior area. Ventral surface of meso- and metathorax orangish brown, except darkened posterior area of metaventrite. Elytra with transverse eburneous band on apex of anterior third, reaching epipleural margin, not reaching suture; anterior third brownish on wide area close to suture, orangish brown on remaining surface; posterior 2/3 blackish, except somewhat brownish irregular area on anterior region of posterior half. Femora orangish brown on peduncle and apex of club, mostly dark reddish brown on remaining surface; tibiae dark brown; tarsi dark brown basally, slightly reddish toward apex. Ventrites 1–4 dark brown, more dark reddish brown depending on light intensity, except black posterior area and yellowish-brown apex; ventrite 5 reddish-brown.

Head. Frons coarsely, abundantly, partially confluently punctate; with yellowish-white pubescence not obscuring integument, and a few long, erect yellowish setae interspersed close to eyes. Vertex coarsely, densely, confluently punctate, with general appearance somewhat rugose; with abundant yellowish pubescence not obscuring integument, and a few long, erect setae of same color interspersed close to eyes. Area behind eyes with sculpturing as on vertex; area behind upper eye lobes and area between eye lobes with pubescence as on vertex; area behind lower eye lobes with yellowish pubescence and a few long, erect setae of same color close to eye, almost glabrous on remaining surface. Genae coarsely, abundantly, partially confluently punctate, except smooth apex; with sparse whitish pubescence and long, erect setae of same color interspersed, except glabrous smooth area. Wide central area of postclypeus coarsely, confluently punctate centrally, punctures finer and sparser laterally; with sparse yellowish-white pubescence and one long, erect, thick yellowish seta on each side. Sides of postclypeus smooth, glabrous. Labrum finely sparsely punctate on posterior half; anterior half depressed, finely, densely punctate on wide central region; posterior half with a few short, decumbent yellowish-white setae, and a few long, erect, thick yellowishbrown setae on sides; anterior half with long, erect, sparse yellowish setae, and short, dense yellowish-brown setae close to anterior margin. Gulamentum smooth, glabrous on posterior half; anterior half slightly depressed, somewhat finely, sparsely punctate, slightly rugose laterally, with short, sparse, decumbent yellowish-white setae, and a few long, erect setae of same color interspersed. Upper and lower eye lobes not connected by carina; distance between upper eye lobes 0.43 times distance between outer margins of eyes; in ventral view, distance between lower eye lobes 0.60 times distance between outer margins of eyes. Antennae 1.5 times elytral length, almost reaching posterior eighth of elytra. Scape with sparse white pubescence dorsally and laterally, and long, erect yellowish setae interspersed dorsally; ventral surface with long, erect and suberect, moderately sparse white setae, shorter than on dorsal surface. Pedicel slightly longer than wide; with sparse white pubescence, and long, erect setae of same color interspersed, except smooth apex. Antennomeres III–XI with abundant white pubescence, denser from V, not obscuring integument; antennomeres III–VII with long, erect, sparse yellowish setae ventrally, setae gradually sparser toward VII; inner apex of antennomere III with moderately long spine with acute apex, about 1.5 times apical width of antennomere, 0.4 times length of IV; antennomere IV with spicule on inner apex. Antennal formula (ratio) based on length of antennomere III (excluding spine): scape = 0.44; pedicel = 0.15; IV = 0.48; V = 0.63; VI = 0.55; VII = 0.44; VIII = 0.39; IX = 0.37; X = 0.29; XI = 0.41.

Thorax. Prothorax distinctly longer than wide; sides gradually widened from anterolateral angles to about middle, distinctly narrowed toward posterior fifth, then subparallel-sided on posterior seventh; posterior margin widely concave. Pronotum coarsely, longitudinally striate-reticulate on wide central area, finely, densely, somewhat rugose-punctate close to anterior margin, finely punctate close to posterior margin; with somewhat sparse yellowish-white pubescence on anterior seventh, abundant yellowish-white not obscuring integument on posterior seventh, somewhat abundant yellowish-brown pubescence centrally, and abundant whitish pubescence on remaining surface of anterior third, sparse yellowish-brown pubescence on central third, and moderately abundant yellowish-brown pubescence on remaining posterior third, this last pubescent area projected centrally toward middle; with long, erect yellowish setae interspersed throughout. Sides of prothorax finely, densely rugose-punctate, except coarsely rugose anterior region, this last area gradually widened toward prosternum. Prosternum opaque, coarsely, abundantly punctate on posterior 2/3; anterior third shining, transversely striate close to anterior margin, transversely striate with a few fine punctures interspersed close to posterior 2/3, somewhat coarsely and sparsely punctate between these two areas; posterior 2/3 with whitish pubescence centrally and close to anterior shiny area, shorter and slightly distinct on remaining surface, and long, erect setae of same color interspersed; anterior third with a few short, bristly yellowish setae on wide central area, longer laterally. Prosternal process with short, sparse white pubescence on anterior 2/3, and long, erect, abundant white setae on posterior third; narrowest area 0.23 times procoxal width. Mesoventrite with a few short, both white and yellowish-brown setae, and a few long, erect, both white and yellowish-brown setae on wide central area, dense white pubescence on sides of inferior region, and moderately abundant white pubescence close to procoxal cavities (this last area partially with yellowish pubescence); mesanepisternum with pubescence and setae as on wide central area of mesoventrite, except dense, wide, oblique white pubescent band close to elytra and inferior region of mesoventrite; mesepimeron with sparse white pubescence close to elytra, dense toward procoxal cavity. Mesoventral process with both, white and yellowish pubescence not obscuring integument. Metanepisternum with moderately sparse yellowish-white pubescence, except posterior region with dense white pubescence. Metaventrite with sparse, bristly, both white and yellowish setae, except posterior region with dense white pubescence. Scutellum with abundant yellowish-white pubescence not obscuring integument. Elytra. Centrobasal crest well-marked, elongate, somewhat roughened; anterior third coarsely, abundantly punctate, punctures finer and denser close to suture; central third densely punctate, general appearance of surface somewhat roughened; posterior third finely, moderately abundantly punctate; anterior third with U-shaped pubescent macula, from humeri to area between eburneous maculae, this macula with both whitish and yellowish pubescence; sutural region on anterior third with somewhat abundant yellowish-brown pubescence not obscuring integument; remaining surface of anterior third with sparse yellowish-brown pubescence, a few short, thick, erect yellowish-brown setae close to inner side of centrobasal crest, and a few long, erect yellowish setae interspersed; central third with a few short, decumbent yellowish-brown setae close to eburneous band, distinctly more abundant toward posterior third, and long, erect yellowish-brown setae interspersed; beginning of posterior third with wide, transverse yellowish-white pubescent band, remaining surface with abundant yellowish pubescence not obscuring integument, and long, erect pale-yellow setae interspersed. Legs. Femora with long, erect yellowish-white setae, and a few short yellowish setae interspersed, except sides of femoral club with dense, longitudinal yellowish-white pubescent band, slightly less distinct on outer side of profemora. Protibiae with a few short yellowish-white setae on dorsal surface and posterior 2/3 of sides, and abundant yellowish-white pubescence on anterior third of sides and ventral surface, this pubescence gradually denser, bristly, and longer toward apex; with long, erect yellowish-white setae interspersed dorsally and laterally. Mesotibiae with moderately abundant, long, erect yellowish-white setae, setae longer and more abundant ventrally. Metatibiae with long, erect, sparse pale-yellow setae dorsally, long, decumbent, both paleyellow and whitish on sides, and both short and long, gradually denser toward apex, yellowish-white setae ventrally. Metatarsomere I slightly longer than II–III together.

Abdomen. Ventrites 1–2 with abundant yellowish-white pubescence laterally, pubescence very sparse on wide central area, absent on apex, and a few long, erect yellowish-white setae interspersed; ventrites 3–4 with abundant yellowish-white pubescence, except almost glabrous anterocentral and posterocentral regions, glabrous apex, and long, erect yellowish-white setae interspersed laterally; ventrite 5 five times wider than long, with abundant yellowish pubescence, more whitish centrally, except almost glabrous anterocentral region, and long erect yellowish setae interspersed.

Female ( Figs 21–22 ). Similar to males; antennae shorter, 1.15 times elytral length, almost reaching posterior third of elytra; ventrite 5 2.5 times wider than long.

Dimensions in mm (holotype male / paratypes male / paratype female). Total length, 6.70/5.75–7.50/5.10– 7.70; prothoracic length, 1.80/1.55–2.10/1.35–1.95; anterior prothoracic width, 1.20/1.05–1.35/0.95–1.30; posterior prothoracic width, 0.95/0.80–1.10/0.75–1.05; widest prothoracic width, 1.40/1.20–1.70/1.15–1.60; humeral width, 1.60/1.40–1.95/1.30–1.85; elytral length, 4.00/3.50–4.50/3.10–4.55.

Type material. Holotype male from MEXICO, Mexico: Cerro Texcotingo , about 7 km S Texcoco, 19º29.993′N 98º48.843′W, beating branches of Quercus sp. , 10.VI.2004, R.L. Westcott leg. ( CASC, formerly LGBC) . Paratypes — MEXICO, Mexico: same data as holotype, 7 males, 6 females (1 male, 1 female, MZSP; 6 males, 5 females, LGBC) ; Km 41-42.5 Hwy Texcoco-Calpulapan, 2685-2720 m, 19º30′43″N 98º52′40″W, beating branches of Quercus sp. , 1 female, 10.VII.2001, R.L. Westcott leg. ( LGBC) .

Etymology. The specific epithet “ lineatus ” (Latin) refers to the longitudinal line of pubescence on the femora.

Remarks. Euderces lineatus sp. nov. is similar to E. nelsoni Chemsak, 1969 ( Figs 23–24 ), but differs as follows: Femoral clubs with distinct longitudinal yellowish-white pubescent band on sides ( Figs 16–18, 21–22 ); pedicel about 1.3 times longer than wide ( Fig. 20 ); antennomere IV with spicule on the inner apex; antennomere V without spicule on the inner apex; antennomere V longer than IV. In E. nelsoni , the pubescence on the femoral clubs does not form a longitudinal band ( Fig. 23 ), pedicel ( Fig. 24 ) is distinctly longer than wide, about 1.85 times, antennomere IV has short, but distinct spine on the inner apex, antennomere V has spicule on the inner apex, and the antennomere V is about as long as IV. It differs from E. hefferni Vlasak & Santos-Silva, 2020 ( Figs 25–26 ), by pubescent band on the femoral club and length of the pedicel (in E. hefferni , they are as in E. nelsoni ), but also by the sparser pubescence on frons (denser in E. hefferni ), and by the prothorax slender ( Fig. 16 ) in males (wider— Fig. 25 - in males of E. hefferni , and ventrite 5 without oblique dense pubescent band on each side (present in E. hefferni ).

Euderces lineatus sp. nov. can be included in the alternative of couplet “33” from Giesbert & Chemsak (1997) (modified):

33(31). Integument of pronotum reddish.................................................................... 33’

- Integument of pronotum dark brown, piceus or black..................................................... 34

33’(33). Ventrite 1 with oblique and dense white pubescent band on each side. Honduras................................................................................................. E. hefferni Vlasak & Santos-Silva, 2020

- Ventrite 1 without dense white pubescent band......................................................... 33”

33”(33’). Pedicel slightly longer than wide; antennomere IV with spicule on the inner apex; antennomere V without spicule on the inner apex; antennomere V longer than IV; femoral clubs with longitudinal white pubescent band on sides. Mexico ( Mexico)........................................................................... E.lineatus sp. nov.

- Pedicel much longer than wide; antennomere IV has short, but distinct spine on the inner apex; antennomere V has spicule on the inner apex; antennomere V is about as long as IV; femoral clubs without longitudinal white pubescent band on sides. Mexico (Sinaloa, Jalisco, Guerrero, Chiapas, Michoacán).............................. E. nelsoni Chemsak, 1969

Figures

FIGURES 16–26. Euderces spp. 16–20) Euderces lineatus sp. nov., holotype male: 16) Dorsal habitus; 17) Ventral habitus; 18) Lateral habitus; 19) Head, frontal view; 20) Scape, pedicel, antennomere III. 21–22) Euderces lineatus sp. nov., paratype female: 21) Dorsal habitus; 22) Ventral habitus. 23–24) Euderces nelsoni Chemsak, 1969, male from Mexico, Sinaloa: 23) Meso- and metafemora; 24) Head, dorsal view. 25–26) Euderces hefferni Vlasak & Santos-Silva, 2020, holotype male: 25) Head, dorsal view; 26) Meso- and metafemora.