Oncideres anomala, Heffern & Nearns & Santos-Silva, 2025

Heffern, Daniel, Nearns, Eugenio H. & Santos-Silva, Antonio, 2025, Description of two new species and new geographical records from the Neotropical region (Coleoptera, Cerambycidae), Zootaxa 5728 (1), pp. 173-186 : 174-177

Oncideres anomala sp. nov.

( Figs 1–8 )

Description. Male holotype. Integument mostly dark brown, more dark reddish brown on some areas, especially depending on light intensity; postclypeus dark brown close to frons, reddish brown with yellowish-brown margins close to anteclypeus; anteclypeus orangish; labrum orangish brown; pedicel dark reddish brown; antennomeres III–X orangish brown, slightly darker basally and apically; antennomere XI orangish brown basally, orangish on remaining surface. Elytra gradually lighter toward apex. Trochanters and base of femora, apex of dorsal surface of mesofemora, and entire dorsal surface of metafemora reddish brown. Pro- and mesotibia reddish brown, browner depending on light intensity; metatibiae dark reddish brown basally, light orangish brown on remaining surface. Tarsomeres reddish brown, more orangish brown depending on light intensity, except dark brown apex of I–II and V. Abdomen mostly brown, more dark reddish brown depending on light intensity.

Head. Frons coarsely rugose-punctate; longitudinally carinate close to eye; with abundant yellowish-brown pubescence close to eyes; central area with tufts of yellowish-brown pubescence and sparse dark yellowish-brown pubescence between them; with a few moderately long, erect brown setae interspersed laterally; median groove distinct from superior half of frons. Vertex slightly transversely rugose, with fine punctures interspersed, except sides of area close to prothorax obliquely, more strongly rugose; with narrow yellowish-brown pubescent band close to antennal tubercles and upper eye lobes, almost glabrous on remaining surface; with a few long, decumbent dark-brown setae near prothorax and a few short, erect dark-brown setae anteriorly. Area behind upper eye lobes longitudinally striate punctate; with irregular areas with dense yellowish-brown pubescence close to eye, glabrous on remaining surface. Area behind lower eye lobes slightly rugose, with sparse, fine punctures interspersed; with narrow yellowish-brown pubescent band close to eye and moderately sparse yellowish-brown pubescence on remaining surface, pubescence denser toward inferior region. Genae 1.75 times longer than lower eye lobe in frontal view; rugose-punctate, except smooth apex; with wide, oblique abundant yellowish-brown pubescent band laterally, abundant yellowish-brown pubescence superiorly close to frons, and sparse yellowish-brown pubescence on remaining surface, except glabrous smooth area. Gulamentum slightly transversely striate, with a few fine punctures interspersed; almost glabrous. Antennal tubercles elevated, more elevated frontolaterally, somewhat flattened, smooth, glabrous on apex of dorsal surface; rugose-punctate on remaining surface; with abundant yellowish-brown pubescence not obscuring integument, pubescence sparser, whitish toward sides, and tuft of long, erect dark-brown setae frontally close to smooth area. Dark wide central area of postclypeus with dense pale-yellow pubescence laterally and centrally, both with whitish pubescence interspersed and not reaching reddish-brown anterior area, and sparse yellowish pubescence on remaining surface, except glabrous region close to reddish-brown anterior area; reddish-brown area with dense light yellowish-brown pubescence, except glabrous area close to labrum, and tuft of long, erect yellowish-brown setae laterally; with transverse carina between dark-brown and reddish-brown areas. Sides of postclypeus glabrous. Labrum coplanar with anteclypeus on posterior 3/4, inclined on anterior third; posterior 2/3 with sparse yellowish-white pubescence, and area close to inclined area with sparse yellowish-brown pubescence and long, erect, thick dark-brown setae interspersed; anterior quarter with dense yellowish-brown pubescence apically, pubescence sparser on remaining surface. Distance between upper eye lobes 0.39 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 3.0 times elytral length, reaching elytral apex near apex of antennomere VI. Scape coarsely rugose-punctate; outer surface with irregular, moderately deep, longitudinal sulcus not reaching base and apex; dorsal and lateral surfaces with sparse yellowish-brown pubescence and sparse, erect, both short and long dark-brown setae interspersed; ventral surface with abundant, bristly yellowish-brown pubescence and long, erect dark-brown setae interspersed, dark setae forming tuft near apex. Pedicel with abundant yellowish-white pubescence not obscuring integument, pubescence sparser dorsally; with long, erect dark-brown setae interspersed, setae longer and more abundant ventrally. Antennomere III not distinctly tumid; with somewhat sparse whitish pubescence, denser ventrally, and abundant, long, erect dark-brown setae interspersed ventrally, setae gradually denser toward apex. Antennomeres IV–XI with sparse whitish pubescence, slightly denser ventrally; IV–X with moderately long, bristly dark-brown setae on entire apex, distinctly more abundant on apical half of IV; IV–V with sparse, long, erect dark-brown setae interspersed ventrally. Antennal formula (ratio) based on length of antennomere III: scape = 0.86; pedicel = 0.14; IV = 0.86; V = 0.72; VI = 0.76; VII = 0.72; VIII = 0.69; IX = 0.67; X = 0.93; XI = 1.58.

Thorax. Prothorax wider than long; sides slightly divergent from anterolateral angles to lateral tubercles, parallel-sided toward posterolateral angles; lateral tubercles rounded, slightly projected, located about posterior third, anterior margin slightly emarginate centrally. Pronotum coarsely, transversely rugose-punctate on anterior 3/4, somewhat sparsely, minutely punctate on posterior quarter; transversely depressed before middle; with transverse, moderately wide and deep sulcus close to posterior quarter, laterally following obliquely toward anterior region of lateral tubercles of prothorax, and transverse, not deep sulcus near posterior margin; with abundant yellowish-brown pubescence laterally on anterior third and surrounding lateral tubercles of prothorax, moderately abundant yellowish-brown pubescence on center of wide transverse posterior sulcus and part of anterocentral third, abundant whitish pubescence on sides of posterior quarter, and very sparse yellowish-brown pubescence on remaining surface; with a few long, erect dark-brown setae laterally close to lateral tubercles of prothorax. Sides of prothorax transversely rugose, except posterior quarter, which is subsmooth with small tubercles superiorly; with yellowish-brown pubescence, denser on some, areas sparser on others. Prosternum transversely, finely striate on wide central area, slightly finely rugose laterally; with abundant yellowish-brown pubescence laterally and close to coxal cavities, and somewhat sparse yellowish-white pubescence on remaining surface. Prosternal process with dense, bristly light yellowish-brown pubescence laterally and centrally on anterior 4/5, and dense pale yellow pubescence on apical fifth; narrowest area 0.41 times procoxal width. Ventral surface of meso- and metathorax with abundant, long, bristly yellowish-white pubescence centrally, and yellowish-brown pubescence laterally, denser on some areas, sparse or almost absent on others. Mesoventral process partially transversely striate; sides and apex slightly concave; narrowest area 0.68 times mesocoxal width. Scutellum minutely punctate laterally and apically, smooth on remaining surface; glabrous, except dense pubescence along margins of anterior third and sparse, short yellowish-brown setae on apical margin. Elytra. With large, moderately elevated gibbosity dorsally on anterior quarter; with somewhat abundant small tubercles dorsally on anterior quarter, including humerus; abundantly, coarsely punctate on remaining surface; with sparse maculae with dense yellowish-brown pubescence, large and more irregular basally close to scutellum; remaining surface with sparse, minute, dark yellowish-brown pubescence; posterior quarter with long, erect dark-brown setae interspersed, setae reaching posterior third on sides. Legs. Coxae with abundant whitish, pale-yellow, and yellowish-brown pubescence; procoxae not uncate. Trochanters with sparse whitish pubescence, except dense, bristly light yellowish-brown pubescence ventrally. Profemora abundantly, coarsely rugose, except on apex of dorsal and lateral surface; with both pale-yellow and yellowish-white pubescence, denser on some areas, sparser on others. Mesofemora very finely rugose and metafemora mostly smooth; pubescence as on profemora. Protibiae with very sparse yellowish-brown pubescence dorsally and on inner surface, somewhat abundant yellowish-brown pubescence on outer surface, and dense, bristly yellowish-brown pubescence ventrally. Mesotibiae with sparse yellowish pubescence dorsally on basal half, somewhat abundant yellowish pubescence on sides, dense, bristly yellowish pubescence ventrally, and dense, bristly yellowish-brown setae dorsally on apical half, setae partially thicker and dark-brown apically. Metatibiae with abundant yellowish-white pubescence dorsally and laterally, whiter depending on light intensity and source, distinctly sparser basally, and dense, bristly yellowish-brown pubescence ventrally. Tarsi with sparse yellowish-brown pubescence, and long, erect dark-brown setae interspersed on I–III and apical third of V. Metatarsomere I slightly longer than II.

Abdomen. Ventrites 1 with abundant whitish pubescence centrally, except yellow pubescence on entire apex, and somewhat abundant yellowish pubescence on part of sides, almost glabrous on remaining surface. Ventrites 2–4 with abundant whitish pubescence anterocentrally, abundant yellow pubescence on part of sides and entire apex, and almost glabrous on remaining surface. Ventrite 5 with dense yellow pubescence centrally and apically, and sparse yellowish-white pubescence on remaining surface; with sparse, long, erect dark-brown setae interspersed on apical third; apex truncate, slightly emarginated centrally.

Note: The antennae of the holotype appear to be 12-segmented, as the apex of antennomere XI is not acuminate and shows the insertion point of antennomere XII, indicating it is not apically broken ( Figs 7–8 ).

Dimensions in mm. Total length, 13.50; prothoracic length, 2.50; anterior prothoracic width, 3.40; posterior prothoracic width, 3.25; maximum prothoracic width, 3.85; humeral width, 5.10; elytral length, 9.10.

Type material. Male holotype from MEXICO, Oaxaca: Sierra de Juárez , 800 m, VI.2.1995, G. Nogueira leg. ( TAMU, formerly DHCO) .

Etymology. Latin, “ anomala ” (abnormal); alluding to the probable presence of a twelfth antennal segment in the species.

Remarks. Oncideres anomala sp. nov. is similar to O. truquii (Thomson, 1868) (see photographs on Bezark 2025 and in Nearns & Tavakilian 2015), but differs as follows: dorsal surface of antennal tubercles lacking projection toward upper eye lobe; antennomere III not distinctly tumid; dorsal surface of elytra with distinct gibbosity anteriorly; ventral surface of antennomere III without dense, erect dark-brown setae on entire surface; and ventral surface of antennomere IV with sparser dark-brown setae. In males of O. truquii , the antennal tubercles with distinct projection dorsally toward the upper eye lobe, antennomere III is distinctly tumid in males, ventral surface of the antennomere III with very dense, long, and erect dark-brown setae on entire ventral surface, ventral surface of the antennomere IV with dense and erect dark-brown setae, and the anterior region of the elytra lacks a dorsal gibbosity.

Figures

FIGURES 1–8. Oncideres anomala sp. nov., male holotype: 1) Dorsal habitus; 2) Ventral habitus; 3) Lateral habitus; 4) Head, frontal view; 5) Anterior region of elytra, postero-anterior view; 6) Anterior region of elytra, latero-oblique view; 7) Apex of antennomere XI, latero-oblique view; 8) Apex of antennomere XI, oblique view.