Cycnoderus ( Cycnoderus ) viridescens, Vlasak & Santos-Silva, 2025

Cycnoderus ( Cycnoderus) viridescens sp. nov.

( Figs 15–24 View FIGURES 15–19 View FIGURES 20–24. 20–22 )

Description. Male holotype ( Figs 15–19 View FIGURES 15–19 , 23 View FIGURES 20–24. 20–22 ). Integument mostly metallic green, darker on parts of prothorax, especially on pronotum. Ventral mouthparts brown, except mentum partially dark brown, palpomeres dark brown with yellowish apex, and lacinia partially yellowish; anteclypeus brown; labrum metallic green posteriorly, brown anteriorly; scape metallic green, except brown dorsal apical region; pedicel dark brown with violaceous reflections; antennomere III dark reddish brown with violaceous reflections, except dark-blue apical fifth; antennomeres IV–XI orangish brown, gradually lighter toward apical segments, except dark-blue apical region, gradually wider toward XI; antennomere XII orangish brown, slightly darker on apical quarter. Elytra with irregular brown areas (may appear to be more brownish depending on light intensity and source). Trochanters reddish brown; femoral peduncles orangish brown; pro- and mesotibiae mostly dark reddish brown, darker basally, with violaceous reflections on some areas; metatibiae dark violaceous basally and apically, dark reddish brown centrally; tarsomeres I and V mostly dark violaceous; remaining surface of I and V, and II–IV mostly dark reddish brown.

Head. Frons abundantly, coarsely punctate; with yellowish-white pubescence not obscuring integument, slightly denser laterally close to clypeus. Vertex abundantly, coarsely punctate, except smooth median groove and posterocentral area; with abundant yellowish pubescence not obscuring integument, absent on smooth areas. Area behind upper eye lobes abundantly, coarsely punctate; with abundant yellowish pubescence not obscuring integument close to eyes, mostly glabrous close to prothorax.Area behind lower eye lobes confluently, coarsely punctate close to eye, sparsely, coarsely punctate close to prothorax; with sparse, bristly yellowish-white setae close to eye, glabrous close to prothorax. Genae abundantly, moderately coarsely punctate close to eye, smooth on remaining surface; with abundant yellowish pubescence close to eye, glabrous on smooth area. Wide central area of postclypeus sparsely, coarsely punctate; with moderately sparse, bristly yellowish-white pubescence. Sides of postclypeus smooth, glabrous. Labrum abundantly, finely punctate close to anteclypeus and anteriorly, smooth centrally; with a few short whitish setae on posterior third, with long, erect yellowish-brown setae interspersed centrally and tuft of long, erect yellowish-brown setae on each side; smooth area glabrous, anterior third with abundant, bristly light yellowish-brown setae, and long, erect yellowish-brown setae interspersed. Antennal tubercles with sculpturing and pubescence as on frons, except smooth and glabrous apex. Area between eyes and antenna with dense golden pubescence. Gulamentum smooth glabrous on posterior half; anterior half coarsely striate-punctate, with sparse, both short and long yellowish setae. Distance between upper eye lobes 0.29 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.50 times distance between outer margins of eyes. Antennae 12-segmented, 3.5 times elytral length, reaching elytral apex at apex of antennomere VI. Scape minutely striate on some areas; sparsely, coarsely punctate, except smooth dorsal apex; with sparse, short, decumbent white setae, except on smooth area; with a few long, erect dark-brown setae interspersed ventrally near apex. Pedicel with sparse, short, decumbent, both white and dark-brown setae; with abundant, long, erect dark-brown setae ventrally. Antennomeres III with moderately sparse, decumbent, short dark-brown setae; with abundant, long, erect dark-brown setae ventrally, longer and more abundant on apical quarter. Antennomere V with moderately abundant, short, decumbent brownish setae not obscuring integument; with a few long, erect dark-brown setae ventrally. Antennomeres VI–XI with moderately abundant, decumbent, short brownish setae not obscuring integument, setae gradually more yellowish white toward XI, except dark-brown setae on dark integumental apical area. Antennomere XII with abundant, decumbent, short yellowish-white setae not obscuring integument. Antennal formula based on length of antennomere III: scape = 0.42; pedicel = 0.14; IV = 0.90; V = 0.97; VI = 0.93; VII = 0.90; VIII = 0.90; IX = 1.01; X = 1.09; XI = 1.22; XII = 1.55.

Thorax. Prothorax distinctly longer than wide; subparallel-sided on anterior third, then slightly widened and rounded toward posterolateral angles. Pronotum abundantly, coarsely punctate, except smooth area close to anterior margin and transversely, finely striate-punctate close to posterior margin; with moderately abundant pubescence not obscuring integument, except glabrous smooth anterior area, pubescence mostly whitish close to glabrous area, yellow on remaining anterior third and on posterior quarter, whitish on remaining posterior third, yellowish white on central third. Sides of prothorax abundantly, coarsely punctate, except transversely rugose-punctate area close to anterior and posterior margins; with narrow, longitudinal, yellow pubescent band close to pronotum, not reaching anterior margin and posterior quarter; remaining surface with sparse whitish pubescence. Prosternum abundantly, coarsely punctate on posterior 2/3, transversely, moderately finely rugose-punctate on anterior third; with sparse whitish pubescence, more abundant close to procoxal cavities and prosternal process. Prosternal process with abundant whitish pubescence not obscuring integument; narrowest area 0.32 times procoxal width. Ventral surface of mesothorax with abundant whitish pubescence not obscuring integument. Mesoventral process with abundant whitish pubescence not obscuring integument; apex widely concave; narrowest area about as wide as mesocoxal width. Metanepisterna with abundant yellowish pubescence not obscuring integument, pubescence denser on posterior quarter. Metaventrite moderately abundantly and coarsely punctate laterally, punctures finer and sparser centrally; with moderately sparse yellowish pubescence laterally, distinctly sparser centrally; with somewhat long, erect whitish setae interspersed throughout. Scutellum with dense pale-yellow pubescence. Elytra. Sides slightly convergent on anterior third, parallel-sided toward posterior sixth, then distinctly narrowed toward acute sutural angle; sutural region divergent on posterior sixth; abundantly, coarsely punctate; with abundant yellowish-white pubescence dorsally close to suture, not reaching sides of dorsal surface; remaining dorsal surface and epipleural region with short, bristly whitish setae in punctures, except abundant whitish pubescence not obscuring integument on posterior third. Legs. Femora strongly pedunculate-clavate; with sparse whitish pubescence, except abundant pubescence on outer surface of metafemoral club; with a few long, erect whitish setae on mesofemoral club and a few long, erect, both whitish and dark-brown setae on metafemoral club. Protibiae with sparse yellowish-white pubescence, except abundant light yellowish-brown pubescence on apical third of inner surface and dense, bristly yellowish-brown pubescence on apical 2/3 of ventral surface. Mesotibiae with sparse yellowish-white pubescence, except dense, bristly yellowish-brown pubescence on apical third of dorsal surface, apex and inferior region of inner surface, and apex of outer surface; with a few long, erect whitish setae. Metatibiae with sparse whitish pubescence, except dense whitish pubescence on apex of dorsal surface, dense, bristly yellowish-brown pubescence on ventral apex, and abundant, bristly dark-brown pubescence on remaining apical third of ventral surface; with long, erect dark-brown setae interspersed. Dorsal surface of pro- and mesotarsomeres with somewhat sparse yellowish pubescence and a few long, erect dark-brown setae interspersed; dorsal surface of metatarsomeres I with moderately abundant whitish pubescence not obscuring integument, and a few long, erect dark-brown setae; metatarsomeres II–V with moderately sparse yellowish pubescence and a few long, erect dark-brown setae.

Abdomen. Sides of ventrites 1–4 with abundant yellowish-white pubescence not obscuring integument; remaining surface with sparse yellowish-white pubescence, except glabrous apex; with long, erect yellowish-white setae interspersed. Ventrite 5 with abundant yellowish-white pubescence not obscuring integument and long, erect yellowish-white setae interspersed; apex truncate.

Female ( Figs 20–22, 24 View FIGURES 20–24. 20–22 ).Antennae, 12-segmented, 3.1 times elytral length, reaching elytral apex at basal quarter of antennomere VI; antennomere XII slightly shorter than XI; apex of abdominal ventrite 5 slightly rounded.

Dimensions (mm) (Male holotype / paratype males/female paratype). Total length, 8.80/8.90–9.45/8.40; prothoracic length, 2.20/2.35–2.60/2.05; anterior prothoracic width, 1.10/1.15–1.20/1.05; posterior prothoracic width, 1.20/1.20–1.30/1.10; maximum prothoracic width, 1.35/1.40–1.50/1.30; humeral width, 1.55/1.70–1.75/1.50; elytral length, 5.15/5.35–5.75/5.05.

Type specimens. Male holotype from ECUADOR, El Oro: Arenillas , < 100 m, on flowers, 19 Feb 2024, J. Vlasak leg. ( MZSP, formerly JVCO). Two paratype males, same data as holotype ( JVCO) ; female paratype, same data as holotype ( MZSP) .

Etymology. The specific epithet “ viridescens ” (“greenish”) refers to the color of the beetle.

Remarks. Cycnoderus ( Cycnoderus) viridescens sp. nov. is similar to C. ( C.) metallicus Bezark, Santos-Silva & Galileo, 2016 (see photographs on Bezark 2025 and in Bezark et al. 2016), but differs as follows: elytra with abundant and moderately long pubescence dorsally; outer surface of metafemora with abundant whitish pubescence; femoral club shorter than metathoracic width; and apex of metafemora slightly surpassing elytral apex in males. In males of C. ( C.) metallicus , the elytral dorsal pubescence is sparser and shorter, especially on the anterior half, the outer surface of the metafemora does not have abundant pubescence, the length of the metafemoral club is equal to metathoracic width, and the apex of the metafemora distinctly surpasses the elytral apex. The new species differs from C. ( C.) chlorizans Chevrolat, 1859 ( Figs 25–29 View FIGURES 25–29 ), as follows: prothorax in males without differentiated sculpturing on pronotum, anterolaterally and laterally, and on sides of the prothorax (present in males of C. ( C.) chlorizans ); pronotal sculpturing coarser in both sexes (finer in both sexes of C. ( C.) chlorizans ); and metatarsomere I distinctly shorter in both sexes (longer in both sexes of C. ( C.) chlorizans ). It differs from C. ( C.) expeditus Chevrolat, 1859 ( Figs 30–31 View FIGURES 30–32 ) by the pronotum in both sexes without longitudinal smooth central area (present in both sexes of C. ( C.) expeditus ), males without longitudinal pubescent band on sides of the pronotum (present in males of C. ( C.) expeditus ), and the sides of the prothorax in males without distinct subsmooth longitudinal area close to prothorax (present in males of C. ( C.) expeditus ); from C. ( C.) rufithorax Gounelle, 1911 ( Fig. 32 View FIGURES 30–32 ) by the antennae in female with long antennomere XII (very short or not free in females of C. ( C.) rufithorax ), prothorax in males without differentiated sculpturing and pubescence on pronotum, anterolaterally and laterally, and on sides of the prothorax (present in males of C. ( C.) rufithorax ), and the pronotal sculpturing coarser in both sexes (finer in both sexes of C. ( C.) rufithorax ); and from C. ( C.) wappesi Santos-Silva & Tavakilian, 2023 (see photographs on Bezark 2025 and in Santos-Silva & Tavakilian 2023), especially by the integument mostly metallic green (not metallic green in C. ( C.) wappesi ) and the prothorax in males without differentiated sculpturing on the pronotum, anterolaterally and laterally, and on the sides of the prothorax (present in males of C. ( C.) wappesi ).