Orthocentrus tenuiflagellum Veijalainen

Veijalainen, Anu, Broad, Gavin R. & Sääksjärvi, Ilari E., 2014, Twenty seven new species of Orthocentrus (Hymenoptera: Ichneumonidae; Orthocentrinae) with a key to the Neotropical species of the genus, Zootaxa 3768 (3), pp. 201-252 : 226

Orthocentrus tenuiflagellum Veijalainen , sp. nov.

Figs 4 A, 7 G, 9 G, 12 G, 14 G.

Fore wing length 3.6–3.7 mm.

Face medially as wide as high, face papillate-pustulate, eyes with sparse and short setae, dorsal ridge of face inbetween antennal sockets without a median prominence; face in profile almost straight, dorsally slightly impressed, edge of clypeus lightly impressed, antennal sockets not on a distinct shelf; malar groove distinct, sharp, almost straight; maxillary palp fairly long, reaching beyond epicnemial carina. In dorsal view, head posteriorly moderately concave, temples distinct, posterior ocellus separated from eye by 1.0–1.3x ocellar diameter, anterior ocellus separated from eye by c. 2.0x ocellar diameter, lacking ocellar-ocular grooves. Minimum distance between antennal sockets about half diameter of socket; antenna slender, thin, about as long as body, with 33–36 long elongate flagellomeres which gradually shortening towards apex, basal flagellomere 0.2x as wide as high and at least as long as scape; scape with internal surface slightly convex, outer side slightly concave.

Mesosoma smooth and polished except mesopleuron with fine striations postero-ventrally and propodeum dorsally with abundant coriaceous microsculpture; mesoscutum lacking notauli; in profile, scutellum somewhat high, metapleuron slightly convex; propodeum with posterior transverse carina present between lateral longitudinal carinae, median longitudinal carinae complete but sometimes very weak, lateral longitudinal carinae reach the level of spiracles; spiracles small.

Legs rather thin and long; coxae and femora polished-coriaceous, tibiae and tarsi coriaceous-granulate; hind coxa 1.2x as long as first tergite, hind femur 3.8x as long as high, hind tibia 4.9–5.2x as long as apically wide; tibiae without clear spine-like setae.

Wings not particularly narrow; fore wing with areolet closed but 3rs-m very weak, areolet about as wide as high, 2m-cu meeting areolet at apical 0.6, vein Rs straight; hind wing vein cu-a intercepted at lower third.

First tergite apically widening, 1.3x as long as apically wide; evenly coriaceous, with traces of two posteriorly almost complete median longitudinal carinae, with transverse impressions originating at about middle of tergite, sloping posteriorly, not meeting centrally. Second tergite 0.7x as long as apically wide; coriaceous to alutaceous, with transverse impressions originating at about middle of tergite, sloping anteriorly along lateral edges and posteriorly below second thyridia, meeting centrally; basal thyridia rectangular/oval, contrastingly coloured, second thyridia oval slightly raised areas at about middle of tergite. Remaining tergites with coriaceous microsculpture, sculpture sometimes stronger on third tergite; third tergite with second thyridia small, round. Ovipositor very thin, straight, without notch; ovipositor sheaths with comparatively short and inconspicuous backwards pointing setae.

Body largely setose except pronotum, mesopleuron and metapleuron; setae very scattered on propodeum and posterior sides of coxae.

Yellow except antennae, dorsal half of head, pronotum anterodorsally, mesopleuron dorsally, mesoscutum and scutellum except sometimes yellow patches lateromedially on mesoscutum, axilla, propodeum, metasoma except some thyridia and sternites, legs except coxae dorsally and apically, and hind coxa dorsally, brown to dark brown, mouthparts, fore and mid coxae, trochanters, trochantelli and tegula, creamy to light yellow, sternites brownish creamy.

Male. Unknown.

Biology. Hosts unknown. The specimens were collected at ground-level in north-eastern Amazonian Peruvian lowland rainforest.

Etymology. Named after the slender basal flagellomere.

Comments. Compared with the other species that have completely papillate face, setose eyes, and second tergite with a posterior transverse groove, the antennal sockets are not on a clear protruding shelf. In addition, the malar groove is not clearly bent towards the occiput, the basal flagellomere is very long and thin (unlike in O. harlequinus and O. wahlbergi ), and the frons completely brown (unlike in O. flavifrons ).

Material examined. Holotype female: ‘ Peru, Loreto, Río Sucusari, Río Napo, Explornapo Camp, 3º15’ S, 72º55’ W, 100 m, 2 Jun 1992, hand coll./raking, T.L. Erwin et al., Lot#305’ ( BMNH).

Paratype: 1 ♀ as holotype but code Lot#307 ( USNM).

Figures

FIGURE 4. Lateral views: Orthocentrus wahlbergi species-group (in part). A: tenuiflagellum, B: umbrocciput, C: wahlbergi. Scale 0.5 mm except in A 1.0 mm.