Obrieniolus robustus del Rio

del Rio, M. Guadalupe & Lanteri, Analia A., 2010, Obrieniolus, a new monotypic genus of Naupactini (Coleoptera, Curculionidae, Entiminae) from the Peruvian Andes and its phylogenetic placement, ZooKeys 102, pp. 51-63 : 53-56

Obrieniolus robustus del Rio sp. n.

Etymology.

The species epithet is an adjective alluding to one of the distinctive characters of the new species, which is its robust body shape.

Material examined.

Holotype. Female, 10.8 mm long, with labels as follows “Perú, La Libertad Dept.,Otuzco P., 1.2 mi NW Agallpampa, on rd. to Trujillo, 2840m, under rocks on dry hillside with sparse brown grass, sparse small brown plants, XI-27-1977, G. Noonan & M. Moffett". Pinned with genitalia dissected and placed in a microvial with glycerin. Deposited at CWOB.

Type locality.

Perú: Department of La Libertad,Otuzco, Agallpampa.

Paratypes.

4 ♀♀ same data as holotype (3 CWOB; 1 MLP).

Description.

Female.Species medium sized (LB: 8.5-10.8 mm), body broadly rounded (Figs 1-2). Integument visible, dark, with imbricate microsculpture, tarsi reddish brown. Vestiture. Dorsum naked of scales; pleura (mesepimeron and metaepisternum) covered with whitish setiform scales; legs and venter with disperse short yellowish decumbent setae, longer and more abundant in inner face of femur and tibia. Rostrum (Fig. 3) slightly shorter than wide (LR/WRa: 0.87-0.94), sides moderately convergent toward apex (WRb/WRa: 1.39-1.40), dorsum flat, punctate-foveolate (with disperse broad punctures and small punctuation between them); dorso-lateral carinae absent; median groove narrow, extended up to posterior margin of eyes or slightly exceeding them. Epistome slightly depressed, narrow, subtriangular, denudate and with strigose sculpture. Scrobes curved, deep, ending below eyes. Mouthparts. Mandibles naked of scales; outer face foveolate, with coarse setae. Maxillae (Fig. 7) with suboval mala, not excavate, almost parallel to longitudinal axis of palpus; basal area with thin long setae (~5), lacinial teeth short, curved and wide (1+3); distal area with wide long setae (~13); palpifer and articles 1-2 of palpi transverse, and article 3 subcylindrical. Prementum (Figs 4-6) subcordate; external surface alveolate, moderately concave and naked of setae; inner surface without setae, with prominent median keel. Palpi smooth, (setae 4 -1-0), forming a very open angle with prementum axis. Gular angle near 90° in lateral view. Eyes medium- sized and moderately convex. Preocular depression absent. Frons wide (ca. 3x diameter of eye), slightly convex, punctate-foveolate. Vertex slightly convex. Postocular constriction distinct. Antennae (Fig. 8) short and robust (LB/LA: 2.80-2.93), covered with wide decumbent setae. Scape slender, reaching middle of eye. Funicular article 2 about 1.2 × as long as article 1; funicular articles 3-7 slightly longer than wide (1.5 ×). Club oval (LC/WC: 2-42-2.47), acuminate.

Pronotum (Figs 1-2) subcylindrical, moderately transverse (WR/LR: 1.27-1.32); flanks moderately curved; disc slightly convex, punctate-foveolate, with imbricate microsculpture; median groove absent; anterior margin slightly emarginated, strongly thickened; base posteriorly “V” shaped. Scutellum subtriangular, minute, convex, denuded.

Elytra (Figs 1-2) subcordate, short (LE/WE: 1.19-1.27), moderately convex, with imbricate microsculpture and finely transversally rugose in the posterior half; base slightly posteriorly curved; humeri subquadrate, slightly prominent; striae well defined, punctures very distant from each other, deep, medium sized in anterior third, smaller in median third and inconspicuous in posterior third; striae 9-10 closer on posterior two-thirds; intervals flat, 3 –4× as wide as striae; apical declivity moderately abrupt; apex subacute. Metathoracic wings absent.

Legs. Black, naked of scales, with imbricate microsculpture. Front coxae slightly separate, 3x closer to anterior margin than to posterior margin of prosternum (almost reaching anterior margin); protibiae with row of 7-11 acute medium sized denticles and strongly acute mucro; meso and metatibiae without denticles and mucro; metatibial apex with broad outer bevel (placed in whole tibial apex), oblique regarding tibial axis, with small whitish iridescent scales; dorsal comb slightly shorter than apical comb or subequal.

Abdomen (Fig. 9) Intercoxal portion of ventrite 1 broader than cavities of hind coxae (1.6 –1.7×); ventrite 2 longer than ventrites 3+4 (1.4 ×); apex of ventrite 5 blunt, slightly emarginated.

Female genitalia. Sternite VIII (Fig. 10) with plate subrhomboidal, elongate, having apical tuft of long setae and a pair of lateral sclerotized stripes reaching 2/3 of plate; apodeme 1.8 –2× longer than plate. Ovipositor (Fig. 11) slender, very long, curved in lateral view, 1.3 –1.35× longer than ventrites 1-5; ventral baculi slender, subparallel; coxites slightly sclerotized; styli well developed, thin, directed backwards. Bursa copulatrix studded with dense and minute spines directed backwards, near the vagina. Spermathecal body (Fig. 12) subcylindrical, strongly sclerotized; nodulus truncate-conical, short; ramus indistinct; cornu of medium length. Spermathecal duct (Fig. 13) very long (~8mm, longer than abdomen) membranous and sinuous.

Morphometrics. Holotype, female: rostrum LR/WRa: 0.94, WRb/WRa: 1.4; antenna LB/LA: 2.93, A2/A1:1.17, club LC/WC: 2.42; pronotum WP/LP: 1.27; elytra LE/WE: 1.22; LE/LP: 2.55.

Male. Unknown.