Polymitoleiopus coronatus, Vlasak & Santos-Silva, 2025

Vlasak, Josef & Santos-Silva, Antonio, 2025, The surprisingly little-known fauna of Cerambycidae (Coleoptera) of Ecuador: description of one new genus and eight new species of Acanthocinini (Lamiinae) and new records in Cerambycinae and Lamiinae, Zootaxa 5653 (2), pp. 151-195 : 172-175

Polymitoleiopus coronatus sp. nov.

( Figs 34–37, 37a )

Description. Holotype female ( Figs 34-37 ). Head capsule dark brown, except light-brown ventral surface and apex of genae, intermaxillary process more orangish brown; ventral mouthparts light reddish brown, except palpomeres mostly yellowish brown;postclypeus light brown with irregular dark-brown areas laterally;anteclypeus dull yellowish brown with irregular light reddish brown areas; labrum dull yellowish brown laterally, mostly brown centrally; scape orangish brown on basal third, brown on remaining surface; pedicel orange basally, gradually brown toward apex; antennomere III dark orangish brown on basal half, reddish brown from middle to apical third, then dark brown, except orangish-brown apex; antennomeres IV–VIII yellowish brown basally, dark brown apically, dark brown area gradually wider toward VIII; antennomere IX reddish brown about basal fifth, dark brown on remaining surface; X–XI dark brown. Pronotum dark brown. Sides of prothorax dark brown, except reddish area close to inferior region of posterior margin. Prosternum dark brown laterally, light reddish brown centrally. Prosternal process light reddish brown. Ventral surface of mesothorax light reddish brown. Metanepisterna and sides of metaventrite light reddish brown; remaining surface of metaventrite mostly dark orangish brown. Scutellum brownish. Anterior half of elytra orangish basally, subtriangular brown macula dorsally on anterior quarter close to suture, lighter in region projected toward humerus, large, subelliptical dark-brown macula laterally, from anterior seventh to near middle, not reaching epipleural margin, and remaining surface of anterior half orangish brown, except longitudinal light reddish-brown macula about middle of dorsal surface, this macula darkened posteriorly, black longitudinal, elliptical macula dorsally near suture, and dark-brown area on sides of previous macula; posterior half of elytra surface blackish on its superior half, dark brown on its inferior half, except sutural area brownish anteriorly, gradually orange toward apex, and orange area close to posterior margin. Coxae yellowish brown. Trochanters and pro- and mesofemoral peduncles pale-yellow; metafemoral peduncles light yellowish brown; about basal half of femoral clubs somewhat dull yellowish brown on outer surface, pale brown on remaining surface, yellowish-brown dorsally; inner surface of femoral clubs light yellowish brown with large longitudinal, slightly oblique dark-brown band on inferior region. Tibiae mostly brownish basally, orange on remaining basal third of protibiae and basal half of meso- and metatibiae, dark brown on apical half. Dorsal surface of protarsomeres I–II orange basally, dark brown on remaining surface; tarsomeres III–IV orange; tarsomeres V orange basally and apically, dark brown on remaining surface; tarsal claws yellowish-brown with dark-brown apex. Abdominal ventrite 1 mostly orangish brown; ventrite 2 mostly orangish brown centrally, dark brown laterally; ventrites 3–5 dark brown with irregular orangish-brown areas.

Head. Frons densely, minutely punctate; with abundant grayish-white pubescence not obscuring integument, pubescence more yellowish white depending on light intensity and source. Area between antennal tubercles mostly with yellowish-brown pubescence close to glabrous median groove; remaining surface with dark-brown pubescence not obscuring integument. Remaining surface of vertex with abundant dark-brown pubescence not obscuring integument, with sparse, short, decumbent yellowish-brown setae interspersed, except glabrous area centrally between antennal tubercles and upper eye lobes, and area close to eyes mostly with yellowish-brown pubescence. Area behind upper eye lobes with abundant yellowish-brown pubescence not obscuring integument. Area behind lower eye lobes with abundant yellowish-brown pubescence not obscuring integument superiorly close to eye, abundant grayish-white pubescence not obscuring integument inferiorly close to eye, glabrous close to prothorax. Genae slightly shorter than lower eye lobe in frontal view; finely, transversely striate-punctate; with somewhat abundant grayish-white pubescence not obscuring integument, pubescence slightly denser close to eye, except glabrous apex; with a few long, erect dark-brown setae interspersed. Wide central area of postclypeus with sparse grayish-white pubescence close to frons, pubescence absent close to anteclypeus; with one long, erect, thick dark-brown seta on each side near frons and long, erect yellowish setae directed forward close to anteclypeus. Labrum with sparse yellowish pubescence on posterior half, glabrous on anterior half, except short yellowish-brown setae directed forward on anterior margin; posterior half with long, erect yellowish setae interspersed, some setae darkened basally. Gulamentum smooth, glabrous, except sparse yellowish pubescence on intermaxillary process. Distance between upper eye lobes 0.30 times distance between outer margins of eyes, about 4.0 times maximum width of one upper lobe; in frontal view, distance between lower eye lobes 0.56 times distance between outer margins of eyes. Antennae 3.7 times elytral length, reaching elytral apex at apical sixth of antennomere V. Scape with abundant yellowish pubescence not obscuring integument, pubescence appearing darker toward apex due to the integumental color. Pedicel with yellowish-white pubescence not obscuring integument and a few long, erect, thick dark-brown setae interspersed ventrally. Antennomeres III–VIII with yellowish-white pubescence not obscuring integument on light integumental area; with dark-brown pubescence not obscuring integument on dark integumental area, with short, decumbent yellowish-white setae interspersed. Antennomeres IX–XI with abundant dark-brown pubescence not obscuring integument with short yellowish-white setae interspersed, light setae more bristly on XI. Antennal formula (ratio) based on length of antennomere III: scape = 0.94; pedicel = 0.09; IV = 1.00; V = 0.88; VI = 0.88; VII = 0.85; VIII = 0.94; IX = 1.06; X = 1.09; XI = 1.42.

Thorax. Prothorax wider than long; anterior constriction distinct, narrow; sides divergent from anterior constriction to lateral tubercles, then strongly narrowed, subparallel-sided toward posterolateral angles; lateral tubercle large, with apex acutely projected backward, located on posterior quarter. Pronotum densely, finely punctate, except transverse row of coarse punctures on posterior quarter, and a few coarse punctures close to base of lateral tubercles of prothorax; with three longitudinal, wide pale-yellow pubescent bands on posterior third, one on each side, another centrally, fused close to posterior margin; remaining surface with abundant dark-brown pubescence not obscuring integument, except grayish-white pubescence not obscuring integument close to lateral tubercles of prothorax and yellowish-white pubescence laterally close to anterior constriction; with a few long, erect dark-brown setae laterally on posterior quarter. Sides of prothorax with abundant dark-brown pubescence not obscuring integument superiorly and abundant grayish-white pubescence not obscuring integument inferiorly. Prosternum with dense yellowish-white pubescence laterally and abundant yellowish pubescence not obscuring integument centrally, except glabrous anterior sulcus. Prosternal process with abundant yellowish pubescence not obscuring integument; narrowest area 0.08 times procoxal width. Central area of mesoventrite with sparse yellowish pubescence, sides with dense yellowish-white pubescence. Mesanepisterna and mesepimera with dense yellowish-white pubescence. Mesoventral process with sparse yellowish-white pubescence; sides slightly narrowed centrally; apex concave; narrowest area 0.21 times mesocoxal width. Metanepisterna and metaventrite with dense yellowish-white pubescence, slightly sparser centrally on metaventrite. Scutellum with sparse yellowish pubescence, slightly denser apically. Elytra. Abundantly, coarsely punctate on anterior half, punctures gradually finer, sparser toward apex on posterior half; apex obliquely truncate. Anterior half with abundant yellowish-white pubescence partially obscuring integument on orangish region and close to suture on anterior quarter, sparser on humeral region, very sparse, brownish pubescence on subtriangular brown macula and longitudinal light reddish-brown macula, abundant dark-brown pubescence not obscuring integument on lateral dark-brown macula and central elliptical black macula; posterior half with abundant dark-brown pubescence not obscuring integument, except abundant whitish pubescence close to suture and entire apex, white pubescent area close to suture widened close to middle of elytron, narrowed toward posterior third, strongly widened, with sinuous sides about beginning of posterior third, then narrowed toward apical pubescent region, and somewhat sparse grayish-white pubescent macula close to epipleural margin about middle. Legs. Femora and tibiae with abundant whitish pubescence not obscuring integument, pubescence appearing darker on dark areas due to integumental color; dorsal surface of posterior half of mesotibiae with short, erect, thick dark-brown setae. Dorsal surface of tarsomeres with sparse, both brownish and yellowish pubescence; apex of I–III and V with long, erect dark-brown setae; Metatarsomere V 1.5 times longer than II–III together.

Abdomen. Ventrites with abundant yellowish-white pubescence not obscuring integument; ventrite 5 with long, erect dark-brown setae interspersed on posterior quarter and apex slightly concave.

Male ( Fig. 37a ). Similar to female, differing especially by the femora stouter.

Variation. In the paratype male the longitudinal light reddish-brown macula on basal half of elytra is fused on its anterior side with the lateral brown macula, the latter slightly less dark than in the holotype.

Dimensions (mm) (holotype female/ paratype male). Total length, 3.45/3.35; prothoracic length, 0.60/0.70; anterior prothoracic width, 0.75/0.75; posterior prothoracic width, 0.75/0.80; maximum prothoracic width, 1.05/1.05; humeral width, 1.15/1.20; elytral length, 2.30/2.25.

Type specimens. Holotype female from ECUADOR, Napo: Pacto Sumaco , 1500 m, 0°40’10”S 77°35’52”W, 23 Nov 2022, J. Vlasak leg. ( MZSP, formerly JVCO) . Paratype male, same data as holotype ( JVCO) .

Etymology. The specific epithet “coronatus ” (Latin, meaning crowned) alludes to the crown-like structure formed by the pale-yellow pubescent bands on the pronotum.

Remarks. Polymitoleiopus coronatus sp. nov. is similar to Polymitoleiopus amoenulus (Bates, 1863) (see photographs on Bezark (2025) and in Monné et al. (2020b)), but differs as follows: prothorax shorter, about 0.65 times maximum prothoracic width; pronotum without yellowish-white pubescence close to all margins; and metatarsomere I distinctly longer than II–III together. In P. amoenulus , the prothorax is longer, about 0.75 times the maximum prothoracic width, the pronotum has yellowish-white pubescence close to all margins, and the metatarsomere I is about as long as II–III together. It differs from Polymitoleiopus histrionellus ( Bates, 1885) (see photographs on Bezark (2025) and drawing in Bates (1885)), by the light pubescent bands on the pronotum not reaching the anterior margin (reaching in P. histrionellus ), and the different elytral pubescent pattern, especially on posterior half; from Polymitoleiopus litoralis (Gilmour, 1962) (see photographs on Bezark (2025) and in Gilmour (1962a)), by the light pubescent bands on the pronotum not reaching the anterior margin (reaching in P. litoralis ), and the different color and elytral pubescent pattern, especially on posterior half; from Polymitoleiopus ornatissimus ( Bates, 1885) ( Fig. 45 ; see also photographs on Bezark (2025) and drawing in Bates (1885)), especially by the upper eye lobes narrower and the distance between them about 4.0 times the maximum diameter of one upper lobe (wider, with the distance between them slightly shorter than twice the maximum diameter of one upper lobe in P. ornatissimus ); and from Polymitoleiopus charillus ( Bates, 1885) (see photographs on Bezark (2025) and in Santos-Silva et al. (2024)), and Polymitoleiopus colibri ( Vlasak & Santos-Silva, 2024) (see photographs on Bezark (2025) and in Vlasak & Santos-Silva (2024)) by the elytra partially orangish anteriorly (dark anteriorly in P. charillus and P. colibri ) and the pronotal light pubescent bands not reaching the anterior margin (reaching in P. charillus and P. colibri ).

Figures

FIGURES 34–37. Polymitoleiopus coronatus sp. nov., holotype female: 34) Dorsal habitus; 35) Ventral habitus; 36) Lateral habitus; 37) Head, frontal view. 37a) Paratype male, dorsal habitus.

FIGURES 43–46. Polymitoleiopus spp. 43–44) Polymitoleiopus mindoensis sp. nov., paratype female: 43) Dorsal habitus; 44) Ventral habitus. 45) Polymitoleiopus ornatissimus (Bates, 1885), holotype, dorsal habitus. 46) Polymitoleiopus clerulus (Bates, 1881), holotype, dorsal habitus. Figures 45–46 by Jesus Santiago Moure.