Nealcidion sublineatum, Vlasak & Santos-Silva, 2022

Vlasak, Josef & Santos-Silva, Antonio, 2022, Five new species of Nealcidion Monné, 1997 from Ecuador (Coleoptera, Cerambycidae, Lamiinae), Zootaxa 5209 (5), pp. 535-554 : 546-549

Nealcidion sublineatum sp. nov.

( Figs 23–27 )

Description. Holotype male. Integument mostly black; ventral mouthparts reddish brown, except palpomeres mostly black; anteclypeus partially pale; labrum dark brown posteriorly, dark yellowish brown anteriorly; scape and pedicel dark brown, lighter depending on light intensity; antennomeres III–VII dark reddish brown except darkbrown apex, blacker on III; antennomeres VIII–X orangish brown, except brown apex; antennomere XI orangish brown, slightly darker apically. Elytra dark brown anteriorly and on sides, brown between innermost dorsal carina and suture from apex of anterior quarter to apex. Femora dark brown; tibiae dark brown except dark reddish-brown central ring; protarsomere I dark reddish brown basally; meso- and metatarsomere I reddish brown on basal 2/3; meso- and metatarsomere IV and basal 2/3 of V dark reddish brown. Apex of ventrites 1–4 yellowish brown; posterior quarter of ventrite 5 dark reddish brown.

Head. Frons abundantly, minutely punctate, except one coarse puncture close to each eye, from which emerges a long, erect brownish seta, and smooth diamond-shaped central area located superiorly; with abundant yellowish-brown pubescence not obscuring integument, pubescence partially brownish on wide, oblique band on each side of median groove, from about middle to antennal tubercles, except glabrous median groove and diamondshaped central area. Antennal tubercles abundantly, minutely punctate; with abundant brownish pubescence not obscuring integument, with yellowish short and decumbent setae interspersed on basal area of frontal surface and part of dorsal surface, and abundant yellow pubescence on remaining surface. Area between antennal tubercles with dark-brown pubescence laterally, and abundant yellow pubescence centrally, except smooth median groove; area between antennal tubercles and superior region of upper eye lobes with abundant yellow pubescence, except glabrous median groove and triangular-shaped central area; remaining surface of vertex with large, subtriangular dark-brown pubescent macula on each side, and pale-yellow pubescent band on each side of glabrous median groove; with long, erect yellowish-white setae interspersed close to eyes.Area behind upper eye lobes and superior 2/3 of lower eye lobes with dense yellow pubescence, except glabrous, subtriangular area behind superior third of lower eye lobe, not reaching eye; remaining surface behind lower eye lobes with yellowish pubescence close to eye, this area distinctly narrower than area with yellow pubescence, glabrous close to prothorax. Genae with sparse yellowish pubescence, and a few long, erect setae interspersed, setae dark brown basally, gradually paler toward apex. Wide central area of postclypeus with somewhat abundant yellowish-brown pubescence close to frons, sparser, bristly close to anteclypeus; with long, erect yellowish-brown setae interspersed laterally, and one very long, erect seta on each side, setae dark brown basally, gradually yellowish toward apex. Sides of postclypeus glabrous. Labrum with yellowish pubescence posteriorly, not obscuring integument, glabrous anteriorly, except yellowish-brown setae on anterior margin; posterior region of pubescent area with long, erect yellowish-brown setae interspersed, some setae dark brown basally. Gulamentum smooth, glabrous, except depressed anterocentral region with sparse yellowish-white pubescence. Distance between upper eye lobes 0.19 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.51 times distance between outer margins of eyes. Antennae 2.7 times elytral length, reaching elytral apex at apex of antennomere V. Scape ( Fig. 24 ) distinctly widened from basal region on inner surface; flattened on anterior 3/4 of dorsal surface; with abundant yellowish-brown pubescence, except dark-brown pubescence with short, decumbent yellowish-white setae interspersed on inner anterior 2/3 of dorsal surface and transverse band on dorsal surface near apex; ventral surface with somewhat abundant, short, erect yellowish-brown setae, erect setae longer and more abundant close to apex. Pedicel with abundant yellowish-brown pubescence, except apex with brown pubescence; ventral surface with a few long, erect brown setae. Antennomere III arched; with abundant yellowish-brown pubescence, except inner surface with sparse pubescence between anterior eighth and base of posterior quarter, and posterior eighth with dark-brown pubescence; ventral surface with long, erect yellowish-brown setae, denser apically. Antennomeres IV–VI with abundant yellowish-white pubescence basally, yellowish-brown pubescence close to dark-brown pubescent area on posterior quarter; antennomeres IV–V with sparse, long, erect yellowish-brown setae ventrally, setae sparser on V. Antennomeres VII–XI with abundant yellowish-white pubescence basally, somewhat abundant light yellowish brown on remaining surface, except sparse yellowish-brown pubescence on apical region of VII–X. Antennal formula based on length of antennomere III: scape = 0.90; pedicel = 0.10; IV = 0.77; V = 0.60; VI = 0.59; VII = 0.57; VIII = 0.57; IX = 0.57; X = 0.56; XI = 0.52.

Thorax. Prothorax wider than long; sides uniformly rounded centrally. Pronotum with large, longitudinal, slightly elevated gibbosity on each side of central region, from anterior fifth to posterior quarter; finely, sparsely punctate on anterior third, with one fine puncture close to outer side of each gibbosity, located slightly after middle, arched row of fine punctures on center of posterior third, one somewhat coarse puncture on each side of posterior third, and irregular row of coarse deep punctures on posterior sixth; anterior 2/3 of gibbosities with abundant black pubescence;with small dark-brown pubescent spot on posterior third of gibbosities,fused with previous dark pubescent region on left gibbosity; with arched, transverse dark-brown pubescent band on each side of middle of posterior third; with inverted 4-shaped dark-brown pubescent macula on each side, from slightly before middle to posterior quarter, more irregular on left side; with short, slightly oblique dark-brown pubescent band on each side below 4- shaped pubescent macula, pubescence very sparse; with somewhat circular brown pubescent ring on each side, from anterior quarter to slightly after middle; with dark-brown pubescence with yellow pubescence interspersed on each side of anterior fifth; with abundant pale yellowish-brown pubescence between gibbosities, except glabrous spot on each side of anterior region, glabrous subelliptical central area on posterior 1/3, and subglabrous longitudinal central area on anterior half; remaining surface with dense yellow pubescence, including oblique band on posterior region of gibbosities, except wide central area of posterior quarter mostly with sparser yellowish-white pubescence. Sides of prothorax with dense yellow pubescence and both large and small dark-brown pubescent maculae interspersed. Prosternum with abundant yellow pubescence laterally, sparser, slightly yellowish centrally, except almost glabrous narrow anterior region. Sides of prosternal process strongly convergent from base to posterior quarter, then strongly widened; narrowest area 0.34 times procoxal width; with yellowish-white pubescence not obscuring integument, sparser laterally and apically. Mesoventrite with sparse yellowish-white pubescence on wide central region, dense, yellowish on superior region of sides, dense, yellowish brown on posterior region of sides, almost glabrous between these two areas. Mesanepisternum and mesepimeron with dense yellow pubescence internally, brown, with yellowish pubescence interspersed externally. Mesoventral process slightly, longitudinally carinate centrally; narrowly sulcate laterally close to margins; truncate apically; with somewhat abundant yellowish pubescence, except mostly glabrous sides; apex 0.54 times mesocoxal width. Metanepisternum with dense yellow pubescence, with darkbrown pubescent maculae interspersed. Sides of metaventrite with abundant dark-brown and yellow pubescence interspersed, pubescence mostly yellow apically; remaining surface with abundant yellowish-white pubescence not obscuring integument, except glabrous metathoracic discrimen, and posterocentral region with longer and yellower pubescence. Scutellum excavated centroapically; with longitudinal yellowish-brown pubescent band centrally and dense black pubescence laterally. Elytra. Distinctly inclined anteriorly from base to base of centrobasal crest; centrobasal crest elevated, with posterior region not distinctly separated from the innermost longitudinal carina, but shorter than metatarsomere I, with dense, decumbent black setae dorsally; innermost longitudinal carina ending near elytral apex; outermost longitudinal dorsal carina distinct from anterior fifth to about posterior quarter; humeral carina distinct only from anterior quarter, ending about posterior fifth; apex obliquely truncate; with short, transverse straw-colored pubescent band basally close to scutellum, not reaching humerus; with longitudinal strawcolored pubescent band from apex of transverse yellowish-brown pubescent band to centrobasal crest, following fragmented by brown pubescent spots toward quadrilateral large macula before middle on innermost longitudinal carina; with longitudinal straw-colored pubescent band from base to quadrilateral large macula before middle on outermost longitudinal carina, fragmented by black pubescent spots; with dense, oblique straw-colored quadrilateral pubescent maculae between longitudinal carinae, located about middle of elytra; with longitudinal straw-colored pubescent band from apex of anterior third to base of posterior third, located near humeral carina, fragmented by black pubescent spots; with longitudinal straw-colored pubescent band along humeral carina, from base to near apex, fragmented by black pubescent spots; with longitudinal pale straw-colored pubescent band on epipleural margin, fragmented by almost glabrous spots; with dense, oblique, quadrilateral straw-colored pubescent macula on anterior third, from innermost longitudinal carina to suture; with somewhat abundant yellowish pubescence between centrobasal crests; with dark yellowish-brown pubescence, with dark-brown pubescent spots interspersed, from apex of centrobasal crest to base of first quadrilateral straw-colored pubescent macula, between innermost longitudinal carina and suture; with dense, subdiamond-shaped straw-colored pubescent macula on posterior third, with its center on innermost longitudinal carina; with dense straw-colored pubescence macula on posterior fifth, entirely covering apex and gradually narrowed toward its anterior region; with longitudinal, fragmented straw-colored pubescent band along suture, pubescence lighter toward elytral apex; with large, irregular black pubescent macula close to posterior quadrilateral pubescent macula; with irregular black pubescent macula on posterior quarter, partially on innermost longitudinal carina; remaining surface mostly with yellowish-brown pubescence, darker toward central region, lighter toward sides. Legs. Femora with abundant yellowish-brown pubescence, except two irregular areas with sparse yellowish-brown pubescence on posterior half of protibiae, one on inner side, another ventrally, and three similar areas on meso- and metafemoral clubs, one dorsally on base, one on posterior half, covering dorsal surface and superior region of sides, another ventrally on posterior half. Tibiae with abundant yellowish pubescence, except two areas on protibiae with sparse pubescence, one on anterior third dorsally and on part of sides, another, larger, after middle dorsally and laterally, area with sparse pubescence on anterior third of meso- and metatibiae, dorsally and laterally, inner side of posterior half of meso- and metatibiae with sparse pubescence, and remaining surface of meso- and metatibiae with abundant yellowish-brown pubescence not obscuring integument, except dense, bristly yellowish-brown pubescence on posterior region of ventral surface; posterior half of dorsal surface of mesotibiae with abundant, short, erect, thick yellowish-brown setae; inner posterior half of mesotibiae with sparse, short, thick, erect yellowish-brown setae; posterior half of metatibiae with somewhat abundant, short, erect, thick yellowish-brown setae dorsally and laterally. Metatarsomere I longer than II–III together.

Abdomen. Ventrites with abundant yellowish-brown pubescence laterally, less so on ventrite 5, slightly sparser, more yellowish white centrally, except glabrous apex of ventrites 1–4; apex of ventrite 5 concave, not spiniform laterally.

Dimensions (mm). Total length, 9.10; prothoracic length, 1.65; anterior prothoracic width, 1.90; posterior prothoracic width, 2.30; maximum prothoracic width, 2.55; humeral width, 3.65; elytral length, 6.50.

Type material. Holotype male from ECUADOR, Napo: 1400 m, 10 km N Wawa Sumaco , 30.IX.2021, J. Vlasak leg. ( MZSP).

Etymology. The specific epithet “sublineatum” (Latin prefix “sub,” meaning almost or nearly, and the Latin adjective “lineatum,” meaning lined) refers to the similarity with N. lineatum .

Remarks. Nealcidion sublineatum sp. nov. belongs to the group of species with a distinct longitudinal carina on the dorsal surface of the elytra. It is similar to N. lineatum ( Figs 17–21 ) but differs as follows: body proportionally wider ( Fig. 22 ); elytra more distinctly narrowed from middle; elytral apex with outer angle not acutely projected, and sutural angle not projected; prosternal process narrower, narrowest area 0.34 times procoxal width; mesoventral process narrower, apical width 0.54 times mesocoxal width. In N. lineatum , the body is proportionally more slender ( Figs 20–21 ), elytra are more parallel-sided from base to about posterior third, elytral apex with outer angle acutely projected and sutural angle projected, prosternal process in males is wider, narrowest area 0.46 times procoxal width, mesoventral process in males is wider, apical width 0.60 times mesocoxal width.

Figures

FIGURES 23–27. Nealcidion sublineatum sp. nov., holotype male: 23) Dorsal habitus; 24) Ventral habitus; 25) Lateral habitus; 26) Head and pronotum; 27) Scape and centrobasal crests.

FIGURES 17–22. 17–21) Nealcidion lineatum (Bates, 1863): 17) Female from Colombia (Saladito, Valle del Cauca), dorsal habitus; 18) Holotype, dorsal habitus, by Jesus Santiago Moue; 19) Protarsus, male from Venezuela (Tachira); 20) Male from Colombia (Saladito, Valle del Cauca), dorsal habitus; 21) Male from Venezuela, dorsal habitus. 22) Nealcidion sublineatum sp. nov., holotype male, dorsal habitus.