Oideterus leoninus, 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 : 539-542

Oideterus leoninus sp. nov.

( Figs 12–23 )

Description. Holotype male ( Figs 12–16 ). Integument mostly metallic dark blue; elytra metallic dark green, except blue sutural margin; legs with greenish reflections.

Head. Frons, vertex, and area behind eyes abundantly, moderately coarsely punctate, denser close to upper eye lobes and to area between eye lobes behind them; frons with abundant, long, erect dark-brown setae, part of them pale yellow toward apex; area between antennal tubercles and anterior margin of upper eye lobes with setae as on frons; area between upper eye lobes with abundant, short, erect brownish setae, part of them pale yellow toward apex (setae sparser than on previous area); remaining surface of vertex and area behind upper eye lobes with abundant, long erect setae, most of them entirely pale yellow or pale yellow toward apex; area behind eyes with setae as on frons; ventral surface close to lower eye lobes with abundant, short dark-brown setae.Antennal tubercles with sculpturing and setae as on frons, with a few long, erect, entirely pale-yellow setae interspersed. Genae smooth, glabrous close to clypeus, somewhat coarsely and abundantly punctate, with abundant, long, erect dark-brown setae on remaining surface. Wide central area of clypeus concave, coarsely, partially confluently punctate, punctures coarser than on frons; with abundant, long, erect brownish pubescence, gradually pale yellow toward apex. Sides of clypeus smooth, glabrous. Labrum with abundant, long, erect yellowish-brown setae. Gulamentum coarsely, somewhat shallowly, densely punctate from base to apex; with long, erect brownish setae throughout. Distance between upper eye lobes 0.40 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.71 times distance between outer margins of eyes. Antennae 2.75 times elytral length, reaching elytral apex at middle of antennomere VI. Scape wide, not flattened dorsally; abundantly, somewhat finely punctate, except narrow smooth apex; with abundant, long, erect brown setae with yellowish-brown apex, slightly less abundant ventrally. Antennomere III without apical projection; IV with projection on outer apical angle slightly shorter than maximum diameter of antennomere; V with projection on outer apical angle slightly longer than maximum diameter of antennomere; VI with projection on outer apical angle almost twice maximum diameter of antennomere; VI with projection on outer apical angle about as long as half length of antennomere; VII with projection on outer apical angle slightly shorter than length of antennomere; VIII–X with projection on outer apical angle longer than length of antennomere; XI arcuate. Antennal formula (ratio) based on length of antennomere III (excluding projections of IV–X; only one male measured): scape = 0.46; pedicel = 0.14; IV = 0.85; V = 0.63; VI = 0.54; VII = 0.46; VIII = 0.42; IX = 0.42; X = 0.41; XI = 0.88.

Thorax. Prothorax wider than long, even excluding lateral tubercles; lateral tubercles subconical basally, with apical half cylindrical with slightly blunt apex, located centrally; posterior margin sinuous, with central area slightly projected backward and slightly emarginate centrally. Pronotum widely, transversely depressed on anterior third; with one large, irregular, slightly elevated gibbosity on each side, from apex of anterior third to near posterior margin, another centrally, slightly elevated, carina-shaped, from anterior quarter to near posterior margin, slightly widened posteriorly; coarsely, densely punctate; with abundant, long, erect brownish setae gradually yellowishbrown toward their apex. Prosternum abundantly, somewhat coarsely punctate; with abundant, long erect setae that are brownish basally and gradually yellowish-brown towards apex. Prosternal process with sculpturing and setae as on prosternum; reaching about anterior third of mesocoxae; subparallel-sided on anterior 3/4, distinctly narrowed on posterior quarter; width on middle 0.64 times narrowest length of prosternum. Ventral surface of meso- and metathorax with abundant, long erect setae that are brownish basally and gradually yellowish-brown towards apex, except glabrous posterocentral area of metaventrite; metanepisternum and metaventrite somewhat coarsely, densely punctate, except smooth posterocentral area of metaventrite; metathoracic discrimen distinct only on wide central area. Scutellum abundantly, coarsely punctate; with abundant, long, erect brownish setae. Elytra. Almost reaching apex of fourth visible abdominal segment; strongly narrowed toward apex; sutural margin dehiscent from scutellum; apex acute on sutural margin; coarsely, densely punctate; with long, erect brownish setae basally, glabrous on remaining surface. Legs. Femora with sparse brownish setae dorsally and laterally, longer basally, and abundant, long, erect brownish setae ventrally. Tibiae with moderately abundant, short, bristly brownish setae. Metatarsomere I slightly shorter than II–III together.

Abdomen. Ventrites abundantly, somewhat coarsely punctate, punctures sparser on center of ventrites 1–3, except smooth apex of ventrites 1–4; with moderately abundant, long, erect brownish setae laterally, mostly shorter centrally on ventrites 1–4 and anterior 2/3 of ventrite 5.

Female ( Figs 17–19 ). Differs from male by the elytra divergent from about middle along sutural margin, subparallel-sided on basal 2/3, slightly narrowed on posterior third; general setae sparser, especially on abdomen. Antennae shorter, 1.6 times elytral length, reaching elytral apex on apex of antennomere IX; antennomeres without long projections on outer apical angle; antennomeres VII–X serrate. Color: integument mostly metallic blue; scape mostly reddish brown ventrally; femora and tibiae reddish brown, except metallic blue basal and apical area of femora, and basal area of tibiae; tarsomeres I–III dark reddish brown with metallic bluish reflections, especially on metatarsomeres, and tarsomeres IV–V metallic blue.

Variation in paratypes female. Lateral pronotal tubercle ranging from broad triangular shape from base to apex to having the apical half narrow and cylindrical. Sutural angle of elytra spiniform or not.

Pupae ( Figs 20–23 ). Integument mostly cream color; exarate; head slightly bent ventrally, vertex visible dorsally; antenna curved from anterior region ventrally about its middle. Male antennae ( Fig 21 ) thicker than female ( Fig 23 ) due to the long projections on most male antennomeres. The projections are folded down in the pupa and are therefore much less apparent than in the imago. Prothorax wider than long, with wide, rounded projection on sides. Elytra reaching apex of second visible abdominal segment in both sexes ( Figs 21, 23 ). Abdominal tergites with short, thick, blackish spines, distributed on a transverse, irregular row; sides of abdominal segments I–IV with spicules; sides of abdominal segments V–VII with spines as on dorsal surface; segment IX with a pair of divergent urogomphi.

Dimensions in mm (holotype male/ paratypes male/female). Total length, 13.10/10.05–14.25/18.50–19.10; prothoracic length, 2.30/1.55–2.25/2.30–2.40; anterior prothoracic width, 3.10/1.90–2.80/2.90–3.15; posterior prothoracic width, 3.00/2.00–3.00/3.15–3.60; maximum prothoracic width, 4.70/3.00–4.50/4.80–5.35; humeral width, 4.90/3.40–5.05/5.35–6.00; elytral length, 7.35/5.25–7.65/10.40–11.40.

Type material. Holotype male from ECUADOR, Azuay: Hwy 582, 10 km NW Cuenca, 3200 m, 6.VIII.2021, J. Vlasak leg. ( MZSP) . Paratypes — 2 females, same data as holotype ( MZSP) ; 3 males and 1 female, same data as holotype ( JVCO) .

Etymology. The specific epithet “leoninus” (Latin, meaning lion-like) refers to the robust, setose pronotum of the male.

Remarks. All specimens were reared from larvae extracted from the same decayed branch (about 10 cm in diameter), which allowed us to assign both sexes to the same species.

By the presence of abundant and long erect setae, males of Oideterus leoninus sp. nov. are similar to males of O. niger Botero, Galileo & Santos-Silva, 2019 (see photographs on Bezark 2022), but differs as follows: prothorax strongly wider, almost as wide as humeral width; elytra gradually narrowed from base; and prosternal process distinctly narrower centrally than the narrowest area of prosternum. In O. niger , the prothorax is distinctly narrower than humeral width, elytra is subparallel-sided from middle, and the prosternal process is distinctly wider centrally than narrowest area of prosternum. As females of O. niger are unknown, it is not possible to compare this sex of the two species. See keys to males and females.

Figures

FIGURES 12–16. Oideterus leoninus, holotype male: 12) Dorsal habitus; 13) Ventral habitus; 14) Lateral habitus; 15) Head, frontal view; 16) Prosternal process.

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.