Leptostylus guianensis, Vlasak & Santos-Silva, 2021

Vlasak, Josef & Santos-Silva, Antonio, 2021, Description of five new species of American Acanthocinini (Coleoptera, Cerambycidae, Lamiinae), Zootaxa 5061 (3), pp. 476-492 : 485-489

Leptostylus guianensis sp. nov.

( Figs 22–27 )

Description. Holotype male ( Figs 22–25 ). Head capsule dark brown, except reddish-brown ventral surface; ventral mouthparts reddish-brown, except dark brown palpomeres (apex of maxillary palpomere IV and labial palpomere III reddish brown); anteclypeus brownish; labrum brownish posteriorly, slightly lighter toward anterior margin; scape reddish brown, except dark brown dorsal apex; pedicel reddish brown basally, gradually dark brown toward apex; antennomeres III–IV reddish brown, except dark brown apex; antennomeres V–X reddish brown basally, dark brown apically, pale yellow on wide central area; antennomere XI reddish brown. Pronotum and sides of prothorax dark brown; prosternum and prosternal process reddish brown. Mesoventrite light brown, except orangish-brown area near mesocoxae; mesoventral process mostly orangish brown, except brown margins, and yellowish-brown apical tabs; mesanepisternum, mesepimeron, metanepisternum, and narrow sides of metaventrite dark brown; remaining surface of metaventrite reddish brown. Scutellum dark brown. Elytra mostly dark brown, with central area reddish brown from scutellum (this area gradually widened from anterior third), and light reddish brown on posterior fifth; sides of anterior 2/3 mostly blackish. Meso- and metafemora reddish brown on peduncle and part of club, dark brown on remaining surface of club; mesofemora mostly reddish brown, with large dark brown macula on sides of club. Tibiae reddish brown on about basal half, dark brown on remaining surface. Tarsi mostly dark brown. Ventrites mostly reddish brown, with some areas brown, especially sides of ventrite 5.

Head. Frons finely, shallowly, abundantly punctate; with abundant pale yellowish-brown pubescence partially obscuring integument, and two transverse, irregular brownish pubescent bands between eyes, another between frontal area of antennal tubercles; with one long, erect dark seta on each side close to eyes. Antennal tubercles with pale yellowish-brown pubescence partially obscuring integument on basal half, brownish on distal half. Area between antennal tubercles and upper eye lobes with abundant pale yellowish-brown pubescence not obscuring integument, except glabrous median groove; central area of vertex between posterior margin of eyes and prothorax with pale yellowish-brown pubescence not obscuring integument; remaining surface of vertex and superior area behind upper eye lobes with brownish pubescence not obscuring integument; remaining surface behind upper eye lobes and behind connection between lobes with dense pale yellow pubescence. Area behind lower eye lobes with dense, pale yellow pubescence superiorly close to eye, followed by glabrous area close to eye, dense pale yellow pubescent macula, and sparse pale yellow pubescence not obscuring integument toward ventral surface; area close to prothorax glabrous. Genae with somewhat abundant pale yellowish-brown pubescence not obscuring integument, except glabrous apex; with a few long, erect dark setae interspersed between the pubescence. Wide central area of postclypeus with somewhat abundant pale yellowish-brown pubescence not obscuring integument, and long, erect dark setae interspersed. Labrum with pale yellowish-brown pubescence not obscuring integument posteriorly, and long, erect dark setae interspersed, almost glabrous anteriorly, except anterior margin with fringe of yellow setae. Gulamentum smooth, glabrous, except anterior region narrowly depressed, with pale yellowish-brown pubescence not obscuring integument. Distance between upper eye lobes 0.25 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 2.55 times elytral length, reaching elytral apex at middle of antennomere VI. Scape with dense white pubescence and abundant nearly glabrous areas interspersed, except dorsal apex with brownish pubescence. Pedicel and antennomeres III–IV with minute very sparse yellowish pubescence; antennomeres V–X with dense white pubescence on light central area, sparse, brownish, with short white setae interspersed on dark areas; antennomere XI with light yellowish-brown pubescence not obscuring integument, and short white setae interspersed. Antennal formula based on length of antennomere III: scape = 0.89; pedicel = 0.15; IV = 1.00; V = 0.83; VI = 0.70; VII = 0.67; VIII = 0.65; IX = 0.65; X = 0.63; XI = 0.61.

Thorax. Prothorax distinctly wider than long; sides gradually divergent from anterolateral angles to large, nearly rounded tubercle after middle, parallel-sided close to posterolateral angles. Pronotum with three very slightly elevated tubercles, one on each side of anterior third, another centrally on posterior half; coarsely, somewhat abundantly punctate; with dense white pubescence, except narrow, longitudinal brownish pubescent band from anterior to posterior margin, narrow, transverse brownish pubescent band close to anterior margin, and short, longitudinal brownish pubescent band on each side of middle on anterior third. Sides of prothorax with dense white pubescence close to pronotum and dark pubescence on remaining surface. Prosternum with pale yellowish-brown pubescence laterally (inferiorly forming longitudinal band); remaining surface with yellowish-white pubescence not obscuring integument. Prosternal process with abundant yellowish-white pubescence not obscuring integument; narrowest area 0.25 times procoxal width. Mesoventrite with somewhat sparse yellowish-white pubescence; mesoventral process with abundant yellowish-white pubescence not obscuring integument. Mesanepisternum, mesepimeron, and metanepisternum with abundant yellowish-brown pubescence. Sides of metaventrite with abundant yellowishbrown pubescence and irregular maculae with brownish pubescence interspersed; remaining surface with abundant yellowish-white pubescence not obscuring integument, whiter toward central apex. Scutellum with central, longitudinal white pubescent band, and sides with brownish pubescence. Elytra. Subparallel-sided on anterior 2/3, convergent on posterior third; apex subrounded; centrobasal crest slightly elevated, dorsally tuberculate; with small, sparse tubercles throughout, nearly all with short dark setae; dorsal surface with dense white pubescence on dark area, mostly yellowish on basal third of light central area, except white pubescence close to suture and interspersed about middle of this area; light central area on posterior 2/3 mostly with yellowish-brown pubescence, longitudinal white pubescent bands interspersed on posterior third, more irregular on posterior fifth, and subelliptical dark brown pubescent macula just after middle; sides of basal 2/3 with dark brown pubescence, and sides of posterior third with white pubescence. Legs. Pro- and mesofemoral peduncle with white pubescence not obscuring integument; pro- and mesofemoral club with abundant yellowish-brown pubescence on lighter areas, brownish on dark area; metafemoral peduncle with yellowish-brown pubescence not obscuring integument, club with abundant white pubescence on lighter areas, brownish on dark areas. Tibiae mostly with white pubescence on basal half, and dark pubescence on posterior half; ventral surface with short, erect dark setae, more abundant toward apex; posterior third of dorsal surface of mesotibiae with short, erect, thick, abundant black setae. Metatarsomere I about as long as II–III together.

Abdomen. Ventrites with abundant white pubescence not obscuring integument.

Female ( Figs 26–27 ). Similar to male. Differs by the antennae slightly shorter (2.4 times elytral length, reaching elytral apex at posterior quarter of antennomere VI).

Dimensions (mm) (holotype male/ paratype female). Total length, 5.40/5.60; prothoracic length, 1.10/1.10; anterior prothoracic width, 1.05/1.10; posterior prothoracic width, 1.30/1.35; maximum prothoracic width, 1.55/1.60; humeral width, 1.85/1.90; elytral length, 3.70/3.95.

Type material. Holotype male from FRENCH GUIANA: Camp Caimans , Kaw Mt. 26.VII-7.IX.2019, J. Vlasak leg. ( MZSP) . Paratype males (4) all from FRENCH GUIANA, all in ( AACP): PK 37 (1 km from the track) light trap, Route de Kaw , 09.IX.1999, Alain Audureau leg. ; PK 37.5 light trap, Route de Kaw , 18.IX.2001, Alain Audureau leg. ; PK 32 light trap, Route de Kaw , 21-28.X.2003, Alain & Sylvaine Audureau leg. ; PK 27 light trap, Route de Kaw , 05.VII.2017, Alain Audureau leg. Paratype males (3) all from FRENCH GUIANA, all in ( JLGC) : 04.X.1999, piège lumineux ( UV), piste de Bélizon PK 15, JL Giuglaris & J Hulin leg. ; 10.I.2005, piège lumineux ( UV), piste de Bélizon PK 15 G15, J.L. Giuglaris leg. ; 26.XI.2006, ex larva, Bélizon, J.L. Giuglaris leg. Paratype males (2, the same locality) all from FRENCH GUIANA, all in ( OMCO): Route de Kaw PK 43, 18.X.1992, piège lumineux, Jean Aimé Cerda leg. Paratype female from FRENCH GUIANA: Amazone Nature Lodge , Kaw Rd. 6, 4.550330, -52.170310, 11-23.VIII.2017, Morris & Wappes leg. ( RFMC) . Paratype females (3) all from FRENCH GUIANA, all in ( AACP): PK 32 light trap, Route de Kaw , 29-31.VIII.2005, Alain Audureau leg. ; ex larva, Route de Kaw , XI.2006, Jean Louis Giuglaris leg. ; PK 36-37 light trap; Route de Kaw , 04-13.IX.2010, Alain & Sylvaine Audureau leg. Paratype females (2) all from FRENCH GUIANA, all in ( JLGC): 06.XI.1994, piège lumineux ( UV), route de Kaw PK 41, JL Giuglaris leg. ; 30.I.1998, piège lumineux ( UV), RD06 PK 45 , J.L. Giuglaris & J. Hulin leg. Paratype females (6) all from FRENCH GUIANA, all in ( OMCO): Route de Kaw PK 27, 15.II.1986, piège lumineux, Odette Morvan leg. ; Route de Kaw PK 45, 25.XII.1986, piège lumineux, Odette Morvan leg. ; Route de Kaw PK 45, 1.I.1987, piège lumineux, Jean Marie Baloup leg. ; Route de Kaw PK 33, 6.XII.1986, piège lumineux, Johannes Chacun Francoz leg. ; Route de Kaw PK 37.5, 4.IX.1999, piège lumineux, Odette Morvan leg. (2 specimens) . Paratype (sex not determined) from FRENCH GUIANA: Saint Georges de l’Oyapock PK 1.5 (pont), 23.IX.2006, piège lumineux, Jean Philippe Champenois leg. ( OMCO) . Paratype (1, sex not determined), FRENCH GUIANA: Montagne des Chevaux (Roura), 28.V.2016, light trap, Frédéric Robin coll. ( FRC) . Paratypes (18, sex not determined): all from FRENCH GUIANA, all in ( PHDC), all Pierre-Henri Dalens leg. : piste de Bélizon pk15+17 (Régina), 10.II.2005, light trap ; Route de Kaw pk29 (Roura), 27.II.2007, ex larva ; Montagne des Chevaux (Roura), 09.IX.2012, automatic light trap ; Montagne des Chevaux (Roura), 10.VIII.2013, automatic light trap ; Montagne des Chevaux (Roura), 17.VIII.2013, automatic light trap ; Montagne des Chevaux (Roura), 11.I.2014, automatic light trap ; Montagne des Chevaux (Roura), 15.VIII.2014, automatic light trap ; Montagne des Chevaux (Roura), 17.I.2015, automatic light trap ; Montagne des Chevaux (Roura), 12.XII.2015, automatic light trap ; Montagne des Chevaux (Roura), 08.IX.2018, canopy automatic light trap ; Montagne des Chevaux (Roura), 17.XI.2018, canopy automatic light trap ; Montagne des Chevaux (Roura), 26.I.2019, canopy automatic light trap ; Montagne des Chevaux (Roura), 08.II.2019, canopy automatic light trap ; Montagne des Chevaux (Roura), 18.V.2019, canopy automatic light trap ; Montagne des Chevaux (Roura), 25.V.2019, canopy automatic light trap ; Montagne des Chevaux (Roura), 27.VII.2019, canopy automatic light trap ; Montagne des Chevaux (Roura), 26.X.2019, canopy automatic light trap ; Savane Flèche (Iracoubo), 22.XII.2020, automatic light trap .

Etymology. The name refers to the type locality of the species.

Remarks. Leptostylus guianensis sp. nov. is somewhat aberrant to this genus due to the pronotal tubercles only slightly developed. However, as it is very similar to L. cretatellus Bates, 1863 ( Figs 28–29 ), we are describing the new species in this genus. It differs from L. cretatellus as follows: body slender; posterior area of the elytra with yellowish-brown pubescence distinctly more acutely and more distinctly projected toward anterior area; narrowest area of the prosternal process slender (0.25 times procoxal width). In L. cretatellus , the body is stouter, the posterior area of the elytra with yellowish-brown pubescence is more triangular and less projected toward anterior area, and the narrowest area of the prosternal process is wider (0.4 times procoxal width).

According to Monné et al. (2013) on L. cretatellus (translated): “Specimens from French Guiana were not examined, although the species was recorded for this area by Monné & Giesbert (1994).” However, we already saw photographs of specimens of L. cretatellus collected in French Guiana, confirming the occurrence of the species there.

Figures

FIGURES 22–29. 22–25) Leptostylus guianensis sp. nov., holotype male: 22) Dorsal habitus; 23) Ventral habitus; 24) Lateral habitus; 25) Head, frontal view. 26–27) Leptostylus guianensis sp. nov., paratype female: 26) Dorsal habitus; 27) Ventral habitus. 28–29) Leptostylus cretatellus Bates, 1863, female from Brazil (Pará, Óbidos): 28) Dorsal habitus; 29) Ventral habitus.