Strangalia tricolor, Vlasak & Santos-Silva, 2023

Strangalia Dejean, 1835 View in CoL

Strangalia tricolor sp. nov.

( Fig. 1-5)

ZooBank:http://zoobank.org/ 40CC1C7D-FE50-4AED-8B3E-9B1B64EC5157

Holotype, ♀, ECUADOR, Napo: Wawa Sumaco , 1400 m, 29.IX.2021, J. Vlasak leg. ( MZSP).

Description of the holotype

Coloration. – Mostly black; ventral mouthparts dark brown, except pa Integument lpomeres black with apex dark yellowish brown. Elytra with four yellowish-brownmaculae,one subcircularlocatedbasallyondorsal surface, one transverse, slightly oblique, with its anterior margin rounded and its posterior margin concave, located dorsally near apex of anterior third, one transverse, located slightly behind middle, almost reaching epipleural margin, not reaching suture, another transverse, located about posterior fifth, almost reaching epipleural and sutural margins. Femora dark brown basally, black apically, orangish onwide centralarea.Abdominal ventrite4mostly reddishbrown;basal half of ventrite 5 reddish brown.

Head. – Frons with anterior plate large, triangular, smooth, glabrous, except transversely, finely striate central area close to clypeus; sides elevated, smooth, glabrous; remaining surface of frons densely, moderately coarsely punctate; with abundant, short, erect black setae not obscuring integument, and long, erect setae interspersed, setae

Reviewer:

black basally, gradually pale toward apex. Area of vertex between antennal tubercles and posterior constriction of head densely, moderately coarsely punctate, with a few coarser punctures interspersed, except narrow smooth area close to superior region of eyes; area close to prothorax somewhat sparsely, finely punctate, punctures denser laterally; nearly all punctures before posterior constriction of head with short, erect dark seta and some punctures with long, erect pale seta; punctures on area of posterior constriction of head with minute, erect dark seta. Area behind eyes densely, moderately coarsely punctate on superior area close to eye, with a few coarse, shallow punctures on remaining surface close to eye; remaining surface moderately abundantly, shallowly punctate; some punctures with minute pale seta. Genae densely, moderately coarsely punctate close to frons and clypeus, except smooth apex, sparsely punctate toward ventral surface; punctures with minute, erect dark seta. Clypeus abundantly, coarsely punctate centrally close to frons; remaining central surface gradually sparsely and finely punctate toward smooth apex; area close to frons with moderately abundant, short, erect dark setae and remaining punctures with pale erect setae, setae longer laterally and toward smooth area. Labrum with transverse row of coarse punctures with long, erect, pale seta on posterior third; sides with moderately abundant, long, erect, brownish setae; remaining surface glabrous except anterior margin with fringe of dark-brown setae. Maxillary palpomere IV fusiform. Gulamentum smooth, glabrous on posterior third, coarsely rugose, glabrous between posterior third and middle, abundantly, coarsely punctate on anterior half, most punctures with a short, brownish seta and some lateral punctures with a long, erect pale seta. Distance between upper eye lobes 0.52 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.62 times distance between outer margins of eyes; in ventral view, distance between lower eye lobes 0.64 times distance between outer margins of eyes. Antennae about as long as elytra, slightly surpassing middle of elytra. Scape abundantly, finely punctate; with abundant, short, bristly blackish setae. Pedicel with sculpturing as on scape; with abundant, short blackish setae directed backward, setae longer than on scape and slightly more abundant ventrally. Antennomeres III–IV with sculpturing as on scape, slightly widened from base to apex; with abundant, decumbent blackish setae not obscuring integument dorsally and laterally, setae slightly longer and more abundant than on scape, projected backward on apex of dorsal surface, setae distinctly bristly and denser ventrally, thicker on apical third of III, throughout on IV. Antennomere V with sculpturing as on scape, distinctly widened from base to apex; setae as on IV. Antennomeres VI–X densely, minutely punctate; with dense blackish pubescence partially obscuring integument, and short blackish setae directed backward on apex. Antennomere XI densely, minutely punctate, parallel-sided on basal 2/3, curved toward apex on ventral surface.

Antennal formula (ratio) based on length of antennomere III:

– Scape = 0.76. – Pedicel = 0.15. – IV = 0.83. – V = 1.00. – VI = 0.65. – VII = 0.55. – VIII = 0.46. – IX = 0.45. – X = 0.41. – XI = 0.60.

Thorax. – Prothorax slightly wider than long; sides distinctly divergent from anterolateral angles to spiniform posterolateral angles. Pronotum abundantly, moderately coarsely punctate, punctures transverse, except smooth area close to posterior margin, smooth anterocentral eight, smooth, narrow longitudinal band on center of remaining anterior region, almost reaching apex of anterior third, and smooth, narrow, longitudinal band on center of posterior 2/3; each puncture with short dark-brown seta, except a few punctures on posterior quarter with long, erect brownish seta; with one coarse, circular puncture with one long, erect yellowish-brown seta on each side of posterior quarter. Sides of prothorax abundantly, moderately coarsely punctate except subsmooth area close to anterior margin, this area gradually widened toward prosternum, and subsmooth area close to posterior margin; punctures with short, bristly brownish seta. Prosternum smooth laterally close to sides of prothorax, abundantly, coarsely punctate on remaining posterior third, punctures transverse, almost smooth on central third, and somewhat sparsely, finely punctate on remaining anterior third; posterior third with moderately abundant, short, yellowish-white setae not obscuring integument, sides glabrous, and remaining anterocentral 2/3 with a few short yellowish-white setae. Prosternal process laminiform centrally; with abundant yellowish-white pubescence, distinctly denser on widened apical region. Mesoventrite abundantly, finely punctate, except almost smooth apex of lateral surface; with moderately sparse yellowish-white pubescence except glabrous smooth area. Mesanepisternum and mesepimeron abundantly, finely punctate, with moderately abundant yellowish-white pubescence not obscuring integument, punctures and pubescence sparser on center of mesanepisternum. Mesoventral process with abundant yellowish-white pubescence not obscuring integument; apical width 0.46 times mesocoxal width. Metanepisternum with abundant yellowish pubescence basally, pubescence distinct sparser on remaining surface. Metaventrite moderately abundantly finely punctate, except smooth area close to metathoracic discrimen; with abundant yellowish pubescence on sides of anterior third, pubescence sparser on remaining surface, except glabrous area close to metathoracic discrimen. Scutellum subtriangular; with sparse brownish pubescence.

Elytra. –Distinctly narrowed from rounded humerus to apex; apex obliquely truncate, triangularly projected on outer angle and shortly projected on sutural angle; dark area with abundant blackish pubescence not obscuring integument; yellowish-brown maculae with moderately abundant yellowish pubescence not obscuring integument.

Legs. – Femora abundantly, finely punctate, except subsmooth posterior half of ventral surface and basal 2/3 of inner surface of meso- and metafemora, and most of basal 2/3 of profemora; pro-, meso- and metafemora with sparse yellowish-white pubescence on basal 2/3, except glabrous inner surface of basal 2/3 of meso- and metafemora, and moderately abundant blackish pubescence on posterior third, except glabrous ventral surface of posterior third; metafemora carinate dorsally on basal third. Tibiae densely, finely punctate; protibiae with abundant blackish pubescence not obscuring integument, except dense, bristly dark pubescence on sides of posterior third and on posterior half of ventral surface; meso- and metatibiae with abundant blackish pubescence not obscuring integument, except denser, bristly dark-brown pubescence on apical third of ventral surface. Metatarsomere I 1.9 times longer than II–III together; metatarsomere II 2.5 times longer than III.

Abdomen. –Ventrites 1–4 with apical margin crenulated ( Fig. 5); 1– 3 densely, finely punctate on sides of anterior region, this area not reaching lateral margin, sparsely, finely punctate on remaining surface, except smooth apex; 4–5 sparsely, finely punctate; posterocentral region of ventrite 5 gradually depressed toward apex; densely punctate area on ventrites 1–3 with abundant yellowish-white pubescence, and remaining surface with sparse, short, decumbent yellowish-white setae; ventrites 4–5 with sparse, decumbent yellowish-white setae. Apex of ventrite 5 and apical tergite with long pale-yellow setae directed backward.

Dimensions (mm)

– Total length, 13.70;

– Prothoracic length, 2.45;

– Anterior prothoracic width, 1.25;

– Posterior prothoracic width, 2.55;

– Humeral width, 3.15;

– Elytral length, 8.65.

Etymology. – The name “ tricolor ” (Latin,meaning with three colors) refers to the three distinct body colors: black, yellow, and orange.

Remarks. – Among the South American species, Strangalia tricolor sp. nov. is similar to S. flavocincta (Thomson, 1860) ( Fig.6-11), but differs as follows (females): antennomeres VI-IX shorter and wider ( Fig. 1); pronotal pubescence sparser, shorter, and dark. In S. flavocincta , the antennomeres VI-IX are longer and slender ( Fig. 7), and the pronotal pubescence ( Fig. 9) is more abundant, longer, and yellowish brown. It is also somewhat similar to S. lachrymans ( Bates, 1885) (see photographs on Bezark 2023) but differs especially by the anterior yellowish-brown macula on elytra not longitudinal (longitudinal in S. lachrymans ), and by the elytral apex

FAUNITAXYS - ISSN (Print): 2269 - 6016 - ISSN (Online): 2970 - 4960

1 - 3. Habitus. 1. Dorsal. 2. Ventral. 3. Lateral. 4. Head, frontal view. 5. Abdominal ventrites 2-3. not strongly oblique, making the outer angle very projected (strongly oblique making the outer angle very projected in S. lachrymans ); it differs from S. saltator ( Bates, 1885) (see photographs on Bezark 2023) by the pronotum entirely black (bicolor in S. saltator ), elytral punctures distinctly finer and more abundant (coarser and less abundant in S. saltator ), and femora black basally (not black basally in S. saltator ); and from S. sexocellata Hovore & Chemsak, 2005 , not considering elytral and femoral colors, by the sides of the prothorax not sinuate (sinuate in S. sexocellata ). Dark areas within the subcircular yellowish-brown maculae on elytral base have formed during drying of the specimen. Originally, the maculate had a smooth margin.