Leptostylus skillmani, Santos-Silva, 2022

Santos-Silva, Antonio, 2022, Two new species of Acanthocinini (Coleoptera, Cerambycidae, Lamiinae) from the Neotropical Region, Zootaxa 5091 (4), pp. 559-566 : 560-561

Leptostylus skillmani sp. nov.

( Figs 1–6 )

Description. Holotype female ( Figs 1–5 ). Integument mostly dark brown; apex of palpomeres yellowish brown; antennomere III reddish brown with abundant dark brown areas interspersed; base of antennomere IV reddish brown; antennomere V yellow with dark brown apex; antennomere VIII yellow on distal 2/3. Tarsomeres V yellowish brown.

Head. Frons minutely punctate toward clypeus and laterally, minutely striate-punctate centrally toward vertex; with grayish-white, yellowish-white, and brownish pubescence not obscuring integument, slightly denser centrally toward vertex. Area between antennal tubercles and upper eye lobes minutely punctate; with abundant yellow pubescence, except small brownish pubescent spot on each side of median groove, and glabrous median groove; remaining surface of vertex glabrous. Area behind upper eye lobes with abundant yellow pubescence close to eye, glabrous close to prothorax. Area behind lower eye lobes with abundant yellowish-brown pubescence not obscuring integument close to eye, this area gradually widened and with brownish pubescence interspersed toward ventral surface, glabrous close to prothorax. Genae 1.7 times length of lower eye lobes; with yellowish pubescence not obscuring integument and grayish-white pubescence interspersed, except glabrous apex. Area between base of antennae and eyes with dense yellow pubescence. Wide central area of postclypeus with sparse grayish-white pubescence and both short and long, erect yellow setae interspersed. Sides of postclypeus glabrous. Labrum coplanar with anteclypeus at posterior 3/4, inclined at anterior quarter; coplanar area with sparse grayish-white pubescence close to anteclypeus, and sparse yellowish setae about middle, longer laterally; inclined area with fringe of yellow setae anteriorly. Distance between upper eye lobes 0.35 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.65 times distance between outer margins of eyes. Antennae 1.35 times elytral length, reaching posterior sixth of elytra. Dorsal and lateral surfaces of scape with brownish pubescence not obscuring integument, and irregular, transverse yellowish-white pubescent bands interspersed; ventral surface mostly with abundant yellowish-white pubescence partially obscuring integument on basal 3/4, and brownish pubescence with yellowish-white pubescence interspersed on apical quarter. Pedicel with yellowish pubescence not obscuring integument. Antennomere III slightly arched; cylindrical in basal 3/4, slightly widened in apical quarter; with yellowish-white pubescence not obscuring integument, and dense, irregular white pubescent maculae interspersed. Antennomere IV slightly, gradually widened toward apex; with white pubescent ring basally, brownish pubescence not obscuring integument, and short suberect white setae interspersed on remaining surface. Antennomere V cylindrical, with abundant white pubescence partially obscuring integument, except yellowish pubescence apically. Antennomeres VI–VII, and IX–X cylindrical; antennomere VIII cylindrical; with brownish pubescence on dark area and white pubescence on light area; antennomere XI conical elongated; with brownish pubescence and white setae interspersed. Antennal formula based on length of antennomere III: scape = 1.12; pedicel = 0.16; IV = 0.61; V = 0.32; VI = 0.26; VII = 0.22; VIII = 0.18; IX = 0.16; X = 0.14; XI = 0.18.

Thorax. Prothorax distinctly wider than long; with narrow sulcus close to anterior margin, and distinct constriction posteriorly; sides slightly curved and irregular between anterolateral angles and posterior constriction. Pronotum with three gibbosities, one on each side of anterior third, another centrally between middle and posterior quarter; coarsely, sparsely punctate, except coarser, deeper row of punctures on posterior fifth (centrally forming two rows), and smooth central gibbosity; with yellow pubescence not obscuring integument, denser laterally on anterior 2/3, shorter and sparser on posterior quarter, and brownish pubescence interspersed; with a few long, erect brownish setae on posterior quarter. Sides of prothorax coarsely, sparsely punctate; with yellow pubescence not obscuring integument. Prosternum with abundant yellow pubescence laterally, pubescence gradually yellowishwhite, sparser toward center. Prosternal process with slightly conspicuous yellowish-white pubescence; narrowest area 0.3 times procoxal width. Mesoventrite with minute, sparse yellowish-white pubescence, except sides with longer, dense yellowish-white pubescence. Mesanepisternum and mesepimeron with abundant brownish pubescence not obscuring integument, and areas with denser yellowish pubescence. Mesoventral process abruptly elevated anteriorly; apex 0.36 times mesocoxal width. Metanepisternum and metaventrite with brownish pubescence not obscuring integument, and irregular yellowish-white pubescent spots interspersed. Scutellum with brownish pubescence not obscuring integument, and yellowish pubescence interspersed apically. Elytra. Parallel-sided in anterior 2/3, strongly narrowed toward subrounded apex in posterior third. Surface coarsely, moderately abundantly punctate on anterior 2/3, punctures finer on posterior third, forming longitudinal row near suture; anterior 2/3 with yellowish-brown pubescence not obscuring integument, sparser on circum-scutellar region, with irregular brownish pubescence interspersed, yellow pubescent spots interspersed, and two small white pubescent spots, one on apex of tubercle placed between centrobasal crest and suture, another about middle of central area; posterior third with dense yellow pubescence (more yellowish-brown on some areas). Centrobasal crest strongly elevated ( Fig. 5 ); with conical tubercle between centrobasal crest and suture ( Fig. 5 ); with two longitudinal carinae laterally, one sub-humeral, another between the latter and centrobasal crest, from base to about posterior quarter, both irregularly tuberculate dorsally and more elevated on their posterior region; with another longitudinal carina from near middle to posterior quarter, placed between innermost lateral carina and suture, more elevated than lateral carinae, ending abruptly in acute projection, irregularly tuberculate dorsally; centrobasal crest with short tuft of dark setae dorsally; innermost carina with three short tufts of dark setae, one near base, two on posterior third; with a few conical tubercle near suture on posterior half ( Fig. 5 ). Legs. Femora pedunculate-clavate, profemora with short peduncle; with brownish pubescence not obscuring integument, and abundant white pubescent maculae interspersed (more yellowish toward apex). Tibiae with abundant brownish pubescence, bristly, thicker on posterior third, and irregular white pubescent maculae on anterior 2/3. Dorsal area of tarsomeres I with white pubescence about basal 2/3; tarsomeres V with white pubescence not obscuring integument; remaining tarsomeres with dark yellowish-brown pubescence; metatarsomere I shorter than II–III together.

Abdomen. Ventrites with brownish pubescence not obscuring integument; ventrites 1–4 with irregular white maculae interspersed; center of ventrite 5 with yellowish-white pubescence basally, pubescence gradually yellowish toward apex; ventrite 5 1.5 times longer than 4, with apex centrally emarginate.

Male ( Fig. 6 ). Similar to females. Antennae slightly longer, 4.5 times elytral length, reaching elytral apex. Ventrite 5 slightly shorter, 1.4 times length of ventrite 4.

Dimensions (mm) (Holotype female/ paratypes male). Total length, 5.50/4.85–5.20; prothoracic length, 1.10/0.90–1.05; anterior prothoracic width, 1.35/1.15–1.30; posterior prothoracic width, 1.55/1.30–1.50; maximum prothoracic width, 1.60/1.35–1.55; humeral width, 2.45/2.05–2.30; elytral length, 4.00/3.35–3.65.

Type material. Holotype female from GUATEMALA, Baja Verapaz: Hotel Ranchito del Quetzal, 15.407148, -88.696255, Pantin 1690 m, 1.VI.2019, Skillman, Wappes & Monzón leg. ( FSCA, formerly FWSC) . Paratypes – 2 males, same data as holotype ( FWSC; MZSP) .

Etymology. The new species is dedicated to Frederick W. Skillman Jr. (FWSC).

Remarks. Leptostylus skillmani sp. nov. is similar to L. quintalbus Bates, 1885 , L. orbiculus Bates, 1880 , and L. petulans Bates, 1880 (see photographs of all these species on Bezark 2021a). It differs from L. quintalbus by the antennae in male reaching elytral apex (surpassing in L. quintalbus ), antennomere IX dark (yellow in L. quintalbus ), absence of large triangular yellowish-white pubescent macula on posterior area of the pronotum (present in L. quintalbus ), centrobasal crest of the elytra distinctly longer than antennomere V (shorter in L. quintalbus ), and tibiae without yellowish central ring (present in L. quintalbus ); from L. orbiculus by the antennae in male reaching elytral apex (surpassing in L. orbiculus ), antennomere IX dark (yellow in L. orbiculus ), absence of large triangular yellowish-white pubescent macula on posterior area of the pronotum (present in L. orbiculus ), elytral tubercle between centrobasal crest and suture present (absent in L. orbiculus ), and tibiae without yellowish central ring (present in L. orbiculus ); and from L. petulans by the antennae in male reaching elytral apex (surpassing in L. petulans ), absence of large triangular yellowish-white pubescent macula on posterior area of the pronotum (present in L. petulans ), elytra without transverse whitish or yellowish-white pubescent band about beginning of posterior third (present in L. petulans ), and tibiae without yellowish central ring (present in L. petulans ).

Figures

FIGURES 1–7. 1–5) Leptostylus skillmani, holotype female: 1) Dorsal habitus; 2) Ventral habitus; 3) Lateral habitus; 4) Head, frontal view; 5) Frontal oblique view. 6) Leptostylus skillmani, paratype male, dorsal habitus. 7) Leptostylus lilliputanus, holotype, dorsal habitus (by Jesus Santiago Moure).