Diaparsis (Diaparsis) iota 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 : 70-71

7. Diaparsis (Diaparsis) iota Khalaim & Villemant , sp. nov.

( Figs 39–42 )

Material examined. Holotype female ( MNHN) PNG, Madang Prov., Mt. Wilhelm (-5.759269, 145.2356), 1700 m, 2–3.XI.2012, leg. Valeba, Tulei, Novotny & Leponce, Plot 4, understorey; MAL-MW1700D-09/16-d09, P2224- 8778.

Paratypes. PNG, Madang Prov.: 1 ♀ ( ZISP) Mt. Wilhelm (-5.760916, 145.2353), 1700 m, 2–3.XI.2012, leg. Valeba, Tulei, Novotny & Leponce, Plot 3, understorey; MAL-MW1700C-09/16-d09, P2208-8776 . 1 ♀ ( MNHN) Mt. Wilhelm (-5.720903, 145.2715), 1200 m, 28–29.X.2012, leg. Philip, Alois, Novotny & Leponce, Plot 3, understorey; MAL-MW1200C-04/16-d04, P1813-11304 . 2 ♀ ( MNHN) Mt. Wilhelm (-5.721022, 145.2703), 1200 m, 2–4.XI.2012, leg. Philip, Alois, Novotny & Leponce, Plot 2, understorey; MAL-MW1200B-09/16-d09, P1802- 11323 and MAL-MW1200B-10/16-d10, P1803-11328 . 1 ♀ ( MNHN) Mt. Wilhelm (-5.720874, 145.2695), 1200 m, 8–10.XI.2012, leg. Philip, Alois, Novotny & Leponce, understorey; FIT-MW1200-A-8/8-d15, P1495-9017 .

Description. Female. Body length 4.5 mm. Fore wing length 3.2 mm.

Head roundly constricted behind eyes in dorsal view; gena 0.55× as long as eye width. Clypeus 2.8× as broad as long, lenticular, separated from face by broad and shallow groove, smooth, with distinct punctures in upper 0.7, convex in lateral view. Mandible slender, weakly constricted in basal 0.4; upper tooth about 2.5× longer than lower tooth. Malar space 0.8–1.0× as long as basal mandibular width. Antennal flagellum ( Fig. 40 ) filiform or weakly tapered towards apex, with 17–19 flagellomeres (18 in holotype); subbasal flagellomeres 1.6–1.8× and subapical flagellomeres 1.3–1.6× as long as broad; flagellomeres 4 to 6 bearing distinct subapical finger-shaped structures on outer surface. Face weakly convex, without distinct median prominence. Face and frons with distinct and dense punctures on granulate and dull background, distance between punctures mostly shorter than one diameter of puncture on face and equal to 2.0× diameter of puncture on frons (punctures sometimes indistinct peripherally). Vertex with fine and sparse punctures on shallowly granulate background. Gena smooth, with fine and sparse punctures. Occipital carina complete, arcuate in dorsal view. Hypostomal carina present in upper half and absent in lower part, not reaching occipital carina.

Mesoscutum very shallowly granulate (sometimes almost smooth), weakly shining, with distinct and moderately dense punctures. Notaulus with distinct longitudinal wrinkle on anterolateral side of mesoscutum. Scutellum with lateral longitudinal carinae present in basal 0.2–0.3. Upper end of epicnemial carina abruptly curved to reach anterior margin of mesopleuron ( Fig. 41 ). Mesopleuron with distinct and dense punctures (distance between punctures mostly shorter than one diameter of puncture), more or less smooth between punctures centrally and shallowly granulate peripherally. Foveate groove ( Fig. 41 ) virtually absent, indicated by weak impression in anterior half of mesopleuron, without transverse wrinkles. Propodeum with distinct basal keel which is 0.45× as long as apical area ( Fig. 42 ). Dorsolateral area of propodeum densely punctate on shallowly granulate (sometimes nearly smooth) background. Propodeal spiracle slightly enlarged, separated from pleural carina by 2.5–3.0× diameter of spiracle. Apical area flat, narrowly rounded ( Fig. 42 ) or poinded anteriorly (as in Fig. 15 ); apical longitudinal carinae distinct, reaching transverse carina anteriorly.

Fore wing with second recurrent vein (2m-cu) postfurcal, weakly pigmented in anterior half and distinct posteriorly. First abscissa of radius (Rs+2r) straight, longer than width of pterostigma. First and second sections of radius (Rs+2r and Rs) meeting at right or slightly acute angle. Intercubitus (2rs-m) short and thick, shorter than abscissa of cubitus between intercubitus and second recurrent vein (abscissa of M between 2rs-m and 2m-cu). Metacarpus (R1) reaching tip of the wing. Second abscissa of postnervulus (Cu&2cu-a) present. Hind wing with nervellus (cu1&cu-a) distinctly reclivous, slanted about 70° from horizontal. Legs slender; tarsal claws long, not pectinate.

First tergite very slender, 6.2× as long as posteriorly broad, round in cross-section centrally, entirely polished, without glymma; tergite weakly and evenly widened from base to apex in dorsal view, with petiole not separated from postpetiole; upper margin of tergite, in lateral view, almost straight in basal 0.6–0.7 and arcuate in apical 0.3–0.4. Second tergite 3.0× as long as anteriorly broad. Thyridial depression deep and very long, 4.0–5.0× as long as broad, with posterior end rounded. Ovipositor slender, distinctly and nearly evenly bent upwards over its total length, with very shallow dorsal subapical depression (as in Fig. 38 ); sheath 1.8× as long as first tergite.

Head and mesosoma reddish brown (most paratypes) or black (holotype). Palpi and mandible (teeth dark red to reddish black) yellow. Clypeus dark reddish brown to dark brown in upper 0.7 and brownish yellow in lower 0.3. Scape and pedicel of antenna yellow-brown, dorsally brown; flagellum entirely black in holotype, and brown to dark brown with three subapical flagellomeres slightly paler in paratypes. Tegula brown or dark brown. Pterostigma brown. Legs yellowish brown to brown, hind leg stronger darkened with brown. Metasoma usually uniformly brown or dark brown, ventrally slightly lighter, with first tergite sometimes dark brown or brownish black.

Male. Unknown.

Variation. One paratype has antennal flagellum strongly tapered towards apex and ovipositor sheath 1.4× as long as first tergite.

Etymology. The species is named after the ninth letter of the Greek alphabet (iota).

Distribution. Papua New Guinea.

Comparison. Diaparsis iota sp. nov. is similar to D. gamma sp. nov. by having flagellum with inconspicuous subapical pale band (this band however is very distinct in D. gamma sp. nov., see Fig. 34 ), but differs from this species in having more slender flagellum, weaker foveate groove of mesopleuron ( Fig. 41 ), strongly punctate propodeum ( Fig. 42 ) and longer second tergite.

Figures

FIGURES 39–42. Diaparsis iota sp. nov., holotype (39, 42) and paratype (40, 41), females: 39—habitus (without wing apices), lateral; 40—head with antenna, lateral; 41—head and mesosoma, ventro-lateral; 42—propodeum, dorsal.

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 33–38. Diaparsis gamma sp. nov., holotype, female: 33—habitus, lateral; 34—head with antennae, lateral; 35— head, front; 36—head and mesosoma, lateral; 37—propodeum, dorsal; 38—distal part of ovipositor, lateral.