Eurysthea nearnsi, Botero & Santos-Silva, 2017

Botero, Juan Pablo & Santos-Silva, Antonio, 2017, Review of the genus Eurysthea Thomson, 1861 (Coleoptera: Cerambycidae: Cerambycinae), Journal of Natural History (J. Nat. Hist.) 51 (45 - 46), pp. 2721-2743 : 2735-2738

Eurysthea nearnsi sp. nov.

( Figures 2d ‒ f and 3d )

Description

Male. Integument dark brown, blackish on head and prothorax; mouthparts reddish-brown; scape dark reddish-brown, gradually lighter toward apex; remaining antennal segments brown, gradually lighter toward distal segments; dorsal surface of femora reddish-brown; elytra with wide, yellowish band starting near middle of lateral margin, following obliquely toward apex of anterior eighth, then, abruptly, obliquely down toward middle of suture, down along suture to about base of posterior quarter, obliquely sloped toward lateral margin near apex, then up along suture, ending before base of posterior quarter; epipleura yellowish.

Head. Frons smooth on triangular plate, except one small, oblong, transverse depression on each side, opaque, minutely, densely punctate between plate and clypeus, interspersed with some fine punctures, shiny, smooth, between plate and vertex; with decumbent, moderately abundant, golden setae on opaque region (gradually shorter, sparser toward centre), interspersed with long, sparse, erect setae, glabrous on triangular plate and toward vertex. Area between antennal tubercles minutely, densely punctate, slightly carinate, finely, sparsely punctate on each side along coronal suture; with short, decumbent, abundant golden setae on punctate region, glabrous centrally. Area between upper eye lobes finely, abundantly punctate laterally, smooth centrally; with decumbent, abundant, golden setae laterally (following that between antennal tubercles), interspersed with long, erect setae, glabrous centrally. Area between upper eye lobes and prothoracic margin minutely, densely punctate laterally, smooth centrally (this area widened toward prothoracic margin); with short, decumbent, abundant golden setae laterally (following that between upper eye lobes), interspersed with long, erect,sparse setae, glabrous on smooth region. Area behind upper eye lobes sub-smooth on narrow area close to eye, minutely, densely punctate toward prothoracic margin, gradually finer, confluently punctate toward lower eye lobe; with decumbent, abundant, golden setae on centre of punctate region (this area narrowed toward lower eye lobe), almost glabrous on remaining surface. Area behind lower eye lobes moderately sparsely, longitudinally sulcate; glabrous except for some erect, sparse,whitish setae. Coronal suture distinct from apex of apex of triangular plate of frons to middle of area between antennal tubercles. Antennal tubercles minutely, densely punctate except for smooth, elevated apex; with short, decumbent, abundant golden setae on punctate region, glabrous on smooth region. Genae finely, moderately sparsely punctate (punctures slightly denser on ventral side); with decumbent, moderately long, sparse golden setae. Gula smooth, glabrous except for some erect setae laterally. Submentum coarsely striate-punctate; with short, decumbent, moderately sparse golden setae, interspersed with long, erect, moderately abundantly yellowish-white setae. Postclypeus opaque, finely, sparsely punctate except smooth sides; with short, decumbent, moderately sparse setae on punctate region, glabrous laterally; with some long, erect setae on sides of punctate region. Labrum finely, abundantly punctate on transverse, narrow area near anteclypeus, smooth on remaining surface except for transverse sulcus centrally near apex (this sulcus minutely, densely punctate); with long, sub-erect, moderately sparse yellowish setae, except for brush with short, abundant, golden setae on transverse sulcus. Mandibles coarsely, confluently punctate laterally and dorsally on basal 3/4, smooth distally and toward inner side; with short and long, moderately sparse, sub-erect yellowish-white setae (long setae more erect). Distance between upper eye lobes 0.5 times length of scape; distance between lower eye lobes in frontal view equal to length of scape. Antennae 1.9 times elytral length, reaching elytral apex at basal quarter of antennomere VII. Scape slightly, gradually enlarged toward apex; finely, abundantly punctate on basal 3/4, smooth on distal quarter; with decumbent, moderately abundant, short, yellowish-white setae interspersed with long, yellowish-white setae. Antennomeres III–XI with short, decumbent, moderately abundantly yellowish-white setae (distinctly shorter, denser toward distal segments); with long, erect, yellowish-white setae on inner side of ventral side (gradually shorter, sparser toward distal segments), with long, erect, yellowish setae around apex of antennomeres III–X. Antennomere III not carinate, with long spine at inner apex (as long as 0.15 times length of antennomere; 0.23 times length of antennomere IV). Antennomere IV not carinate, with long spine at inner apex (as long as 0.15 times length of antennomere). Antennomeres V–X unarmed at apex. Antennal formula (ratio) based on antennomere III (without spine): scape = 0.55; pedicel = 0.17; IV = 0.71; V = 0.96; VI = 1.01; VII = 1.01; VIII = 0.93; IX = 0.82; X = 0.79; XI = 0.86.

Thorax. Prothorax slightly wider than long (1.05 times). Sides rounded, without tubercles, with largest width placed on basal half; coarsely, densely punctate except subsmooth, transverse band at base, widened toward procoxal cavity, and area close to head with transverse, fine striae (this area widened toward ventral side); with short, abundant, golden setae (not obscuring integument); with oblique, narrow band with golden pubescence from angle of procoxal cavity to sub-smooth area close to head. Pronotum with five gibbosities: two sub-circular, placed at each side just after middle; two sub-circular, placed on each side of posterior quarter; one elongated, from midlength to posterior quarter; lateral gibbosities interconnected by distinct, longitudinal carina. Pronotal surface coarsely, moderately sparsely punctate between gibbosities; area outside of region delimited by gibbosities coarsely, densely punctate except for narrow, smooth, central area between apex of central gibbosity and anterior quarter; with short, abundant, golden setae (not obscuring integument), slightly denser between gibbosities, basally, laterally, and close to carinae between lateral gibbosities; glabrous on gibbosities and carinae between lateral gibbosities; with long, erect, sparse, yellowish-white setae, mainly between gibbosities. Prosternum coarsely, densely punctate on posterior 2/3, finely, transversely striate (subsmooth on some areas) on anterior third (this area widened centrally); with short, abundant golden setae on punctate area, with short, erect, sparse golden setae on distal third. Prosternal process smooth, longitudinally sulcate; with short, erect, sparse, whitish setae, denser, golden near apex. Mesoventrite, mesepimeron and mesanepisternum with short, decumbent, abundant golden setae (slightly distinct depending on angle of light) interspersed with moderately short, sub-erect yellowishwhite setae. Mesosternal process abundantly punctate (punctures coarser, sparser centrally, finer denser laterally); apex deeply emarginate, with distal lobes rounded at apex. Metanepisternum with short, decumbent, abundant golden setae (almost indistinct depending on angle of light) interspersed with long, sub-erect, yellowish-white setae (more erect, abundant basally). Metaventrite microsculptured laterally and around mesocoxal cavities, finely, sparsely punctate on remaining surface; with short, decumbent, abundant golden setae on microsculptured area; with long, sub-erect, yellowish-white setae throughout. Scutellum with short, dense, decumbent golden setae.

Elytra. Moderately coarsely, abundantly punctate on anterior half, gradually finer, sparser toward apex; with long, erect, sparse, thick, yellowish-white setae throughout (more abundant basally, laterally, and near apex); apex obliquely truncate, with long spine at outer angle and short, triangular projection at sutural angle.

Legs. Inner and outer apices of meso- and metafemora with triangular projection; femora and tibiae with moderately long, abundant yellowish-white setae (denser toward apex of tibiae).

Abdomen. Ventrites finely, moderately abundantly punctate; with moderately long and abundant, decumbent, yellowish-white setae (denser laterally; denser centrally toward distal ventrite). Ventrite V 0.65 times as long as IV; apex truncate, slightly emarginate centrally.

Dimensions in mm (female). Total length, 29.50; prothorax length, 4.80; anterior width, 3.20; posterior width, 3.80; largest prothoracic width, 4.95; humeral width, 6.05; elytral length, 20.70.

Type material

Holotype male from ECUADOR, Carchi: road El Chical – Carolinae (0°50 ʹ 20 ʺ N / 78°13 ʹ 39 ʺ W; 2360 m), 6–7 February 2013, Sinyaev & Romanov col. ( MZSP).

Etymology

The specific name is in honour of Dr Eugenio Nearns, for his contributions to the knowledge of the cerambycid fauna and for his constant kindness to both authors.

Remarks

Eurysthea nearnsi sp. nov. resembles E. koepckei ( Franz 1956) , E. latefasciata (Fonseca- Gessner 1990), E. magni fi ca Martins, 1985, E. punctata ( Fonseca-Gessner 1990) , E. robertsi ( Fonseca-Gessner 1990) , E. subandina ( Fonseca-Gessner 1990) , and E. tatianakozlovae sp. nov. by the elytral pattern. It differs from all these species by the prothorax without lateral tubercles. It also resembles E. rotundicollis , but differs by the spine of the antennomeres III and IV distinctly longer (about as long as pedicel), and by the femora slender. In E. rotundicollis the spine of antennomere III is shorter than pedicel and in antennomere IV is dentiform, and the femora are sub-fusiform.

Figures

Figure 2. (a–c) Eurysthea tatianakozlovae sp. nov., holotype female: (a) dorsal habitus; (b) ventral habitus; (c) lateral habitus. (d–f) Eurysthea nearnsi sp. nov., holotype male: (d) dorsal habitus; (e) ventral habitus; (f) lateral habitus.

Figure 3. Detail of elytra. (a) Eurysthea antonkozlovi sp. nov.; (b) Eurysthea barsevskisi sp. nov.; (c) Eurysthea tatianakozlovae sp. nov.; (d) Eurysthea nearnsi sp. nov. Arrows show the lanceolate setae.