Baryssinus giuglarisi, Santos-Silva & Bezark & Tavakilian & Audureau, 2025

Baryssinus giuglarisi sp. nov.

( Figs 1–7 View FIGURES 1–5 View FIGURES 6–7 )

Description. Male holotype ( Figs 1–5 View FIGURES 1–5 ). Integument mostly dark brown, blackish on some areas; ventral mouthparts mostly reddish brown; labrum dark reddish brown on posterior 2/3, reddish brown on anterior third; scape and pedicel dark reddish brown, browner depending on light intensity; antennomeres III–VII orangish brown about basal 2/3, gradually lighter toward VIII (missing antennomeres VIII–XI on left antenna, and IX–XI on right antenna), then gradually reddish brown to brown on apical third, reddish-brown and brown areas gradually lighter toward VII. Elytra dark brown basally, gradually brown from anterior half. Femora mostly dark reddish brown, lighter depending on light intensity. Tibiae dark reddish brown on base and apical half, orangish on remaining surface. Tarsomeres I orangish brown on basal 2/3, mostly reddish brown on apical third; tarsomeres II–IV mostly reddish brown; protarsomere V mostly reddish brown; meso- and metatarsomeres V orangish on basal 3/4, brownish on apical quarter. Apex of abdominal ventrites 1–4 reddish brown; ventrite 5 dark brown on basal quarter, light reddish brown on apical quarter, dark reddish brown on remaining surface.

Head. Frons densely, finely punctate; with abundant straw-colored pubescence not obscuring integument, pubescence denser close to eyes. Area between antennal tubercles with dense pale-yellow pubescence, except glabrous median groove; area between antennal tubercles and upper eye lobes transversely glabrous, forming a cross with median groove; area between upper eye lobes with abundant straw-colored pubescence not obscuring integument, except glabrous median groove; remaining surface of vertex glabrous. Area behind upper eye lobes with abundant straw-colored pubescence partially obscuring integument close to eyes, glabrous on remaining surface. Area behind lower eye lobes with abundant straw-colored pubescence partially obscuring integument on superior region close to eyes, with sparse narrow pubescent band close to eye toward ventral surface, glabrous on remaining surface. Genae 0.4 times length of lower eye lobe; with moderately abundant straw-colored pubescence close to eye, sparse on remaining surface, except glabrous apex; with one long, erect, thick blackish seta laterally. Antennal tubercles with pubescence as on central area of frons, except denser pubescence on part of frontal region. Wide central area of postclypeus with abundant straw-colored pubescence not obscuring integument, and one long, erect dark-brown seta on each side. Sides of postclypeus glabrous. Labrum with moderately abundant straw-colored pubescence not obscuring integument on posterior 2/3, glabrous on anterior third, except short yellowish-brown setae on anterior margin; pubescent area with long, erect dark setae interspersed. Gulamentum smooth, glabrous, except intermaxillary process with straw-colored pubescence not obscuring integument. Distance between upper eye lobes 0.15 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.47 times distance between outer margins of eyes. Antennae (from base of scape to apex of antennomere VIII) 1.9 times elytral length, reaching elytral apex at apical third of antennomere VI. Scape with abundant whitish pubescence not obscuring integument; with a few long, erect grayish setae near apex of ventral surface. Pedicel with abundant whitish pubescence not obscuring integument; with a few thick, erect, both moderately short and long black setae ventrally. Antennomere III with abundant whitish pubescence on basal 2/3, pubescence slightly denser basally, and yellowish-brown pubescence not obscuring integument on apical third; with a few thick, both moderately short and long black setae ventrally; with a few moderately long, thick black setae directed forward on sides of apex. Antennomere IV with abundant whitish pubescence on basal 2/3, pubescence slightly denser basally, and yellowish-brown pubescence not obscuring integument on apical third; with a few thick, both moderately short and long black setae ventrally; with a few moderately long, thick black setae directed forward dorsally and laterally; with two very long, erect setae on apex, one located ventrally, another on inferior region of inner surface, setae black basally, gradually paler toward apex. Antennomeres V–VII with abundant whitish pubescence not obscuring integument, except sparser pubescence on apical area; V–VI with two very long, erect setae on apex, one located ventrally, another on inferior region of inner surface, setae black basally, gradually paler toward apex; VII with one very long, erect seta on apex of inferior region of inner surface, seta black basally, gradually paler toward apex. Antennomere VIII with abundant whitish pubescence not obscuring integument, except sparser pubescence on apex of apical third. Antennal formula based on length of antennomere III: scape = 0.95; pedicel = 0.14; IV = 0.83; V = 0.69; VI = 0.69; VII = 0.67; VIII = 0.67.

Thorax. Prothorax distinctly transverse; anterior constriction narrow, well marked; sides slightly tumid close to anterior constriction, distinctly divergent from this point to slightly after middle, subparallel-sided toward apex of lateral tubercle, which are a continuation of the sides of the prothorax, convergent toward posterolateral angles, except narrow parallel-sided apical area; anterior transverse sulcus well marked throughout. Pronotum densely, very finely, shallowly punctate, except moderately abundant, coarse punctures near posterior margin; with abundant straw-colored pubescence not obscuring integument, except: glabrous anterior and posterior sulci; one large, irregular yellowish-brown pubescent macula on each side of anterior half; moderately sparse yellowish pubescence anterocentrally; two irregular whitish pubescent spots on each side of anterior half, obliquely arranged, innermost smaller; moderately abundant white pubescent band on each side of middle on coarsely punctate area; and narrow white pubescent band on posterior margin. Sides of prothorax with abundant yellowish-brown pubescence not obscuring integument, except glabrous anterior sulcus. Prosternum with abundant pale yellowish-brown pubescence laterally and abundant whitish pubescence centrally, both not obscuring integument.Prosternal process with abundant whitish pubescence not obscuring integument; narrowest area 0.24 times procoxal width. Ventral surface of meso- and metathorax with abundant pale yellowish-brown pubescence laterally and sparser whitish pubescence centrally, both not obscuring integument. Sides of mesoventral process convergent on anterior 3/4, then widened on apical quarter; narrowest area 0.70 times mesocoxal width; apex 0.78 times mesocoxal width. Scutellum with moderately abundant pale yellowish-brown pubescence not obscuring integument, except glabrous central region of apical 2/3. Elytra. Sides slightly, gradually narrowed from base to apex; apex subtruncate; abundantly, coarsely punctate on anterior third, punctures gradually sparser, finer toward almost smooth apical quarter; dorsal surface with four longitudinal carinae, some of them reaching posterior fifth and fused on their apices; humeral carina moderately well marked; dorsal surface with abundant pale yellowish-brown pubescence not obscuring integument on anterior region, and remaining surface with abundant yellowish pubescence gradually whiter toward apex not obscuring integument, except dense, irregular, longitudinal white pubescent bands, partially fused on some areas, partially absent on sides between anterior third and area just after middle, and white pubescent spot close to anterior margin of centrobasal crest; area between humeral carina and epipleural margin with abundant yellowish-brown pubescence not obscuring integument from base to just after middle, then abundant, whitish, not obscuring integument toward apex; centrobasal crest with dense, long, erect tuft of dark-brown setae directed backward; remaining elytral surface without erect setae. Legs. Femora with abundant whitish pubescence not obscuring integument.Tibiae with abundant whitish pubescence not obscuring integument except: apical half of ventral surface of protibiae with abundant, bristly yellowish pubescence not obscuring integument; apical third of mesotibiae with sparser whitish pubescence, with dense, bristly pale-yellow pubescence on dorsal sulcus, short, thick, erect dark-brown setae between beginning of apical third and dorsal sulcus, apical third of ventral surface with abundant, bristly yellowish-brown pubescence, and a few short, erect, thick dark brown setae interspersed on apical half of ventral surface; and apical fifth of ventral surface of metatibiae with dense, bristly yellowish-brown pubescence, and a few short, erect setae interspersed on apical 2/3 of ventral surface. Dorsal surface of tarsomeres with whitish pubescence not obscuring integument, pubescence sparser toward tarsomere V; metatarsomere I slightly longer than II–III together.

Abdomen. Ventrites with abundant white pubescence not obscuring integument, except glabrous central apex of ventrites 1–4; apex of ventrite 5 slightly concave centrally.

Female. ( Fig. 7 View FIGURES 6–7 ). Similar to male, differing by the abdominal apex distinctly surpassing elytral length, and last tergite and ventrite elongated.

Dimensions (mm) ( holotype male). Total length, 7.30; prothoracic length, 1.45; anterior prothoracic width, 1.55; posterior prothoracic width, 1.90; maximum prothoracic width, 2.40; humeral width, 2.75; elytral length, 5.20.

Type specimens. Male holotype from FRENCH GUIANA: Matiti, ex larva, 19.II.2010, J.L. Giuglaris leg. ( CASC, formerly LGBC). Paratypes 19/II/2010, 4 males, 3 females, Z.A. Wayabo Matiti EX LARVA J.L. Giuglaris leg. ( JLGC) , 15/III/2011 1 female Z.A. Wayabo Matiti EX LARVA, J.L. Giuglaris leg. ( JLGC) , 23/I/2014 1 female Z.A. Wayabo Matiti Glazed Intercept Trap J.L. Giuglaris leg. ( JLGC) .

Etymology. The species is named in honor of our colleague Jean-Louis Giuglaris, of Matoury, French Guiana, in recognition of his ongoing efforts in collecting and rearing cerambycids and making them available for study.

Remarks. Baryssinus is a problematic genus that includes species with ( e.g. B. marisaea Martins & Monné, 1974 ) and without ( e.g. the type species, B. penicillatus Bates, 1864 ) erect setae on the elytra. Females of Baryssinus have the ovipositor long and distinctly surpassing the elytral apex. Therefore, we chose to describe the new species in Baryssinus until it is possible to make a complete revision of the genus.

Baryssinus giuglarisi sp. nov. is similar to B. albifrons Monné & Martins, 1976 (see photographs on Bezark (2025) and in Monné et al. (2020a)) and B. bilineatus Bates, 1864 (see photographs on Bezark (2025) and in Monné (1990)), but differs as follows: pronotum without longitudinal dark band on each side of middle; elytra without oblique dark pubescent band from apex of centrobasal crest to near suture; elytra without longitudinal dark pubescent band dorsally after middle; elytra with longitudinal white pubescent bands dorsally; elytra without dense white pubescent macula apically; and apex of abdomen distinctly surpassing elytral apex in females. In B. albifrons and B. bilineatus , the pronotum has a longitudinal dark band on each side of the middle, elytra with oblique dark pubescent band from apex of centrobasal crest to near suture and dark longitudinal pubescent band dorsally after middle (sometimes, absent in B. bilineatus ), elytra without longitudinal white pubescent bands dorsally and with dense white pubescent macula apically, and apex of the abdomen slightly surpassing the elytral apex in females.