Oideterus ecuadorensis, Vlasak & Santos-Silva, 2022

Vlasak, Josef & Santos-Silva, Antonio, 2022, Descriptions, notes, and a new record in Oideterus Thomson (Coleoptera, Cerambycidae, Prioninae, Anacolini), Zootaxa 5175 (5), pp. 535-547 : 543-545

Oideterus ecuadorensis sp. nov.

( Figs 24–29 )

Description. Holotype female ( Figs 24–28 ). Integument mostly metallic dark blue; elytra reddish, except dark blue apex and posterior third of epipleural margin. Femora, tibiae, and tarsomeres I–II dark reddish brown with violaceous and bluish reflections.

Head. Frons and area between antennal tubercles abundantly, coarsely punctate, except smooth central area of frons close to clypeus; with abundant, long, erect brownish setae, most of them paler apically, and a few entirely pale setae interspersed. Vertex coarsely punctate, punctures slightly coarser than on frons, sparser centrally, more abundant close to eyes; punctures with long, erect dark seta, gradually paler toward apex. Area behind upper eye lobes mostly smooth close to eye, abundantly, coarsely punctate on remaining surface; with not abundant, long, erect dark setae gradually paler toward their apex. Area behind lower eye lobes abundantly, coarsely punctate; with abundant, long, erect dark setae; ventral surface close to lower eye lobes with short, somewhat sparse dark brown setae. Antennal tubercles coarsely punctate basally, punctures distinctly finer on remaining surface, except smooth apex; setae as on frons basally, shorter, sparser on remaining surface, except glabrous apex. Genae coarsely punctate toward ventral surface, smooth toward clypeus; with abundant, long, erect brownish setae on punctate area, glabrous on smooth area. Wide central area of clypeus concave, abundantly, coarsely punctate laterally, punctures sparser centrally; with long, erect dark setae gradually paler toward their apex. Sides of clypeus smooth, glabrous. Labrum with both short and long brownish setae directed forward. Gulamentum coarsely rugose-punctate, especially on anterior 3/4, punctures finer on center of anterior quarter; with long, erect, somewhat sparse dark setae. Distance between upper eye lobes 0.40 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.67 times distance between outer margins of eyes. Antennae 1.55 times elytral length, reaching elytral apex at basal quarter of antennomere X. Scape flattened dorsally and ventrally; coarsely, moderately coarsely and sparsely punctate, except smooth dorsal apex; with short, erect, sparse brownish setae, and long, decumbent setae of same color interspersed ventrally. Pedicel and basal area of antennomere III with short, erect brownish setae, distinctly sparser on III; outer apical angle of III rounded; outer apical angles of IV–V not projected, angulate; outer apical angles of VI–X triangularly projected; XI flattened on posterior half, with rounded apex. Antennal formula (ratio) based on length of antennomere III (not including projection of VI–X): scape = 0.44; pedicel = 0.12; IV = 0.85; V = 0.70; VI = 0.58; VII = 0.50; VIII = 0.39; IX = 0.37; X = 0.27; XI = 0.53.

Thorax. Prothorax distinctly wider than long, even excluding lateral tubercles; lateral tubercles subtriangular, flattened dorsoventrally, somewhat expanded and sinuous before central projection, which has blunt apex; posterior margin sinuous, widely convex centrally. Pronotum with large, slightly elevated, strongly irregular gibbosity on each side of central region, and narrow, slightly elevated, longitudinal, carina-shaped gibbosity centrally, from near base to near apex; coarsely, densely punctate between gibbosities, coarsely rugose-punctate on remaining surface; with abundant, long, erect brown setae throughout. Prosternum coarsely rugose-punctate, slightly triangularly tumid close to base of prosternal process; with abundant, long, erect brownish setae. Prosternal process with sculpturing and setae as on prosternum; reaching level of anterior margins of mesocoxal cavities; sides slightly narrowed on basal third; apex rounded; middle 2.2 times the narrowest length of prosternum. Ventral surface of meso- and metathorax with abundant, long, erect brownish setae, most gradually paler toward their apex; metaventrite abundantly, coarsely punctate, except smooth area close to metathoracic discrimen. Scutellum coarsely punctate laterally, smooth centrally; with short, erect, somewhat sparse brownish setae on punctate area, glabrous on smooth area. Elytra. Sides explanate, widened on basal quarter after humerus, then distinctly narrowed toward rounded apex; coarsely, densely punctate; humerus somewhat projected upward; sutural margins gradually divergent from near scutellum; with short, erect yellowish-brown setae on sides of scutellum, glabrous on remaining surface. Legs. Femora with long, erect yellowish-brown setae, more abundant ventrally; tibiae with short, erect yellowish-brown setae, slightly more abundant and longer ventrally. Metatarsomere I shorter than II–III together.

Abdomen. Ventrites 1–4 coarsely, somewhat sparsely punctate, except smooth apex; ventrite 5 abundantly, coarsely punctate laterally and close to apex, smooth on remaining central area; punctate areas with long, erect yellowish-brown setae, more abundant laterally; smooth areas glabrous.

Variation. Sides of elytra not widened on basal quarter after humerus, and not distinctly narrowed toward apex ( Fig. 29 ).

Dimensions in mm (holotype female/ paratype female). Total length, 23.20/21.95; prothoracic length, 3.20/2.80; anterior prothoracic width, 4.10/3.55; posterior prothoracic width, 4.80/4.35; maximum prothoracic width, 6.60/6.70; humeral width, 7.50/7.25; elytral length, 12.95/12.65.

Type material. Holotype female from ECUADOR, Azuay: Hwy 582, 10 km NW Cuenca, 3200 m, 6.VIII.2021, J. Vlasak leg. ( MZSP) . Paratype female, same data ( JVCO) .

Etymology. The specific epithet “ecuadorensis” refers to the country where the holotype was collected.

Remarks. The holotype female of Oideterus ecuadorensis sp. nov. is similar to females of O. leoninus sp. nov. but differs as follows: body distinctly wider ( Fig. 24 ); elytra strongly narrowed toward apex ( Fig. 24 ); and prosternal process distinctly wider than the narrowest area of prosternum ( Fig. 25 ). In females of O. leoninus , the body is distinctly slender ( Fig. 17 ), elytra subparallel-sided on basal 2/3 ( Fig. 17 ), and prosternal process distinctly narrower centrally than the narrowest area of prosternum ( Fig. 19 ). Although the elytra in the paratype female of O. ecuadorensis ( Fig. 29 ) is not strongly narrowed toward the apex, they are not parallel-sided on the basal 2/3, and the body is also more robust than in females of O. leoninus , still allowing to use these features to separate these species. Oideterus ecuadorensis differs from O. latithorax Botero, Galileo & Santos-Silva, 2019 (see also photographs on Bezark 2022) especially by the elytra not strongly dehiscent on suture (strongly dehiscent in O. latithorax ); and from O. inaequalis Galileo & Santos-Silva, 2015 by the elytra strongly and gradually narrowed from basal quarter to apex (slightly narrowed from humerus to about posterior third in O. inaequalis ). See key to females of Oideterus .

Figures

FIGURES 24–29. Oideterus ecuadorensis. 24–28) Holotype female: 24) Dorsal habitus; 25) Ventral habitus; 26) Lateral habitus; 27) Head, frontal view; 28) Prosternal process. 29) Paratype female, dorsal habitus.

FIGURES 17–23. Oideterus leoninus: 17–19) Paratype female: 17) Dorsal habitus; 18) Ventral habitus; 19) Prosternal process. 20–23) Pupae: 20) Oblique habitus, male; 21) Ventral habitus, male; 22) Dorsal habitus, paratype female; 23) Ventral habitus, paratype female.