Diaparsis (Diaparsis) beta Khalaim & Villemant, 2021

Khalaim, Andrey I. & Villemant, Claire, 2021, Tersilochinae (Hymenoptera: Ichneumonidae) of Papua New Guinea: genus Diaparsis Förster, part 2. Species with notaulus, Zootaxa 5016 (1), pp. 56-80 : 59-60

2. Diaparsis (Diaparsis) beta Khalaim & Villemant , sp. nov.

( Figs 4–10 , 60 )

Material examined. Holotype female ( MNHN) PNG, Madang Prov., Mt. Wilhelm (-5.721022, 145.2703), 1200 m, 29–30.X.2012, leg. Philip, Alois, Novotny & Leponce, Plot 2, understorey; MAL-MW1200B-05/16-d05, P1798- 11309.

Paratypes. PNG, Madang Prov.: 1 ♀ ( MNHN) Mt. Wilhelm (-5.720874, 145.2695), 1200 m, 26–27.V.2013, leg. Sam et al., Plot 4, understorey; MAL-MW1200’D-14/16-d14, P4826-20983 . 1 ♀ ( ZISP) same data, but Plot 1; MAL-MW1200’A-14/16-d14, P4778-20976 .

Description. Female. Body length about 3.6 mm. Fore wing length 2.8 mm.

Head weakly rounded and strongly constricted behind eyes in dorsal view ( Fig. 4 ); gena half as long as eye width. Clypeus ( Fig. 5 ) about 2.6× as broad as long, lenticular, separated from face by very shallow impression, smooth, distinctly punctate in upper half; clypeus flat in lateral view. Mandible slender, weakly constricted in basal half; upper tooth twice as long as lower tooth. Malar space 0.7–0.8× as long as basal mandibular width. Antennal flagellum ( Fig. 6 ) filiform, with 18–20 flagellomeres; all flagellomeres except basal and apical ones 1.3–1.5× as long as broad; flagellomeres 4 and 6 bearing subapical finger-shaped structures on outer surface. Face weakly convex. Face and frons granulate, dull, finely punctate (punctures mostly indistinct because of granulation). Vertex granulate, dull, with very fine indistinct punctures. Gena shallowly granulate, weakly shining, impunctate or with very fine indistinct punctures. Occipital carina complete, evenly arcuate in dorsal view ( Fig. 4 ).

Mesoscutum granulate, dull, finely punctate. Notaulus with distinct wrinkle on anterolateral side ( Figs 4, 6 ). Scutellum with lateral longitudinal carinae present in basal 0.2. Foveate groove extending in anterior half of mesopleuron, strongly oblique, broad and deep, with distinct transverse wrinkles ( Fig. 9 ). Propodeum with distinct basal keel which is 0.5–0.65× as long as apical area; dorsolateral area granulate, dull, impunctate in holotype ( Fig. 7 ) and distinctly punctate in paratypes ( Fig. 8 ). Propodeal spiracle separated from pleural carina by 3.0–4.0× diameter of spiracle ( Fig. 9 ). Apical area flat, widely rounded anteriorly ( Figs 7, 8 ); apical longitudinal carinae reaching transverse carina anteriorly.

Fore wing with second recurrent vein (2m-cu) postfurcal, with weakly pigmented bulla in anterior part. First abscissa of radius (Rs+2r) straight, longer than width of pterostigma. First and second sections of radius (Rs+2r and Rs) meeting at slightly acute angle. Intercubitus (2rs-m) weakly thickened, somewhat shorter than abscissa of cubitus between intercubitus and second recurrent vein (abscissa of M between 2rs-m and 2m-cu). Metacarpus (R1) almost reaching tip of the wing. Second abscissa of postnervulus (Cu&2cu-a) present, thus brachial cell is closed posteriorly. Hind wing with nervellus (cu1&cu-a) weakly reclivous. Legs slender.

First tergite slender, 4.5× as long as posteriorly broad, slightly trapeziform in cross-section centrally, smooth, with very shallow striate laterally, without distinct glymma; in dorsal view, tergite with spiracles situated on conspicuous lateral prominences ( Fig. 60 ), postpetiole slightly wider than petiole; upper margin of tergite, in lateral view, weakly arcuate in basal 0.7 and somewhat stronger arcuate in apical 0.3. Second tergite 1.8× as long as anteriorly broad in holotype and 1.65× in paratypes. Thyridial depression deep, 2.0–2.5× as long as broad, with posterior end rounded. Ovipositor robust, high, strongly compressed laterally, weakly and evenly bent upwards over its total length, with weak dorsal subapical depression, abruptly constricted at apex ( Fig. 10 ); sheath 1.1× as long as first tergite.

Head, mesosoma and first segment of metasoma brownish black to black; clypeus brownish yellow in lower 0.4 ( Fig. 5 ). Palpi and mandible (except dark red teeth) brownish yellow. Antenna brownish black, scape and pedicel yellow-brown ventrally, flagellum slightly paler at base. Tegula yellow-brown to brown. Pterostigma brown. Wings hyaline. Legs brownish yellow, all coxae more or less darkened with brown. Metasoma posterior to first tergite predominantly dark brown, ventrally and at distal end paler.

Male. Unknown.

Variation. Paratypes possess flagellum more slender basally, with subbasal flagellomeres 1.9–2.0× as long as broad; stronger punctures on head and mesosoma; distinctly punctate dorsolateral areas of propodeum ( Fig. 8 ); stronger spiracular prominences on first tergite; and shorter second tergite.

Etymology. The species is named after the second letter of the Greek alphabet (beta).

Distribution. Papua New Guinea.

Comparison. The new species is easily distinguished from all Oriental and Oceanic congeners by its robust, unusually high, strongly compressed laterally and abruptly constricted at apex ovipositor ( Fig. 10 ); similar ovipositor is known in several species of the subgenus Pectinolochus Aubert (genus Tersilochus Holmgren ). Diaparsis beta sp. nov. also possesses a notable first metasomal tergite with spiracles situated on conspicuous lateral prominences, in dorsal view ( Fig. 60 ).

Figures

FIGURES 1–8. Diaparsis alpha sp. nov., holotype, female: 1—head and mesoscutum, dorsal; 2—head with antenna, lateral; 3—apex of metasoma with ovipositor, lateral. Diaparsis beta sp. nov., holotype (6, 7) and paratype (4, 5, 8), females: 4—head and mesoscutum, dorsal; 5—head, front; 6—antenna, lateral; 7, 8—propodeum, dorso-posterior.

FIGURES 9–16. Diaparsis beta sp. nov., holotype (9) and paratype (10), females: 9—head, mesosoma and base of metasoma, lateral; 10—ovipositor, lateral. Diaparsis delta sp. nov., holotype, female: 11—habitus (without wing apices), lateral; 12—head, front; 13—antenna, postero-lateral; 14—head and mesoscutum, dorsal; 15—propodeum, dorsal; 16—apex of tergite 1 and tergite 2, dorsal.

FIGURES 60–62. Diaparsis beta sp. nov., holotype, female: 60—first tergite, dorsal. Diaparsis epsilon sp. nov., holotype, female: 61—head, front. Diaparsis eta sp. nov., holotype, female: 62—veins of fore wing.