Diaparsis (Diaparsis) delta 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 : 61-62

3. Diaparsis (Diaparsis) delta Khalaim & Villemant , sp. nov.

( Figs 11–19 )

Material examined. Holotype female ( MNHN) PNG, Madang Prov., Mt. Wilhelm (-5.806698, 145.0729), 3200 m, 31.X.–1.XI.2012, leg. Dahl, Kaupa, Novotny & Leponce, Plot 1, understorey; MAL-MW3200A-16/16-d16, P3353-9166.

Non-type material. PNG, Madang Prov.: 1 ♂ ( MNHN) same data as holotype, but Plot 4, MAL-MW3200D- 16/16-d16, P3401-9167 . 2 ♂ ( MNHN, ZISP) same locality, altitude and collectors, but 24–25.X.2012, Plot 4; MAL- MW3200D-09/16-d09, P3394-9140 .

Description. Female. Body length about 4.0 mm. Fore wing length 3.5 mm.

Head strongly rounded behind eyes in dorsal view ( Fig. 14 ); gena 0.8× as long as eye width. Clypeus ( Fig. 12 ) twice as broad as long, almost flat, separated from face by broad groove, smooth in lower half, with fine and sparse punctures on very shallowly granulate background in upper half. Mandible robust, distinctly constricted in basal half; upper tooth 1.5× longer than lower tooth. Malar space 1.1× as long as basal mandibular width. Antennal flagellum ( Fig. 13 ) slightly clavate, with 18 flagellomeres; subbasal flagellomeres 1.8–2.0× as long as broad, subapical flagellomere square; flagellomeres 4 to 6 bearing subapical finger-shaped structures on outer surface ( Fig. 17 ). Face weakly convex, with very shallow striae centrally on slight median prominence ( Fig. 12 ). Face and frons with fine and dense punctures on granulate and dull background (punctures partly indistinct because of granulation). Vertex granulate, dull, impunctate centrally and with very fine punctures laterally. Gena shallowly granulate, centrally almost smooth, weakly shining, with fine punctures. Occipital carina complete, evenly arcuate in dorsal view ( Fig. 14 ). Hypostomal carina absent at least in lower part, not reaching occipital carina.

Mesosoma granulate, dull; mesoscutum finely and densely punctate; mesopleuron with fine punctures centrally, without distinct punctures peripherally; dorsolateral area of propodeum impunctate. Notaulus with fine longitudinal wrinkle on anterolateral side of mesoscutum ( Fig. 14 ). Scutellum with lateral longitudinal carinae present in basal 0.1–0.2. Foveate groove absent ( Fig. 17 ). Propodeum with distinct basal keel which is half as long as apical area ( Fig. 15 ). Propodeal spiracle separated from pleural carina by 1.5× diameter of spiracle ( Fig. 17 ). Apical area flat, pointed anteriorly ( Fig. 15 ); apical longitudinal carinae weak but complete, reaching transverse carina anteriorly.

Fore wing with second recurrent vein (2m-cu) postfurcal, weakly pigmented in anterior 0.4 and distinct posteriorly. First abscissa of radius (Rs+2r) slightly arcuate, longer than width of pterostigma. First and second sections of radius (Rs+2r and Rs) meeting at slightly acute angle. Intercubitus (2rs-m) thickened, slightly longer 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. Hind wing with nervellus (cu1&cu-a) weakly reclivous. Legs slender; tarsal claws not pectinate.

First tergite 4.0× as long as posteriorly broad, slightly trapeziform in cross-section centrally, smooth, with very slight striae laterally, without glymma; in dorsal view, tergite with spiracles situated on conspicuous lateral prominences, postpetiole distinctly wider than petiole and clearly separated from it ( Fig. 16 ); upper margin of tergite, in lateral view, slightly arcuate in basal 0.7 and stronger arcuate in apical 0.3 ( Fig. 11 ). Second tergite almost twice as long as anteriorly broad. Thyridial depression almost 3.0× as long as broad, with posterior end narrowly rounded. Ovipositor long and slender, weakly bent upwards over its total length, with shallow dorsal subapical depression and distal end broad and somewhat stronger upcurved ( Fig. 18 ); sheath about 3.0× as long as first tergite.

Head, mesosoma and first tergite black. Palpi, mandible (teeth dark red) and lower 0.4 of clypeus brownish yellow. Scape and pedicel of antenna yellow-brown, dorsally brown; flagellum brown basally to brownish black apically ( Fig. 13 ). Tegula brownish yellow. Pterostigma brown. Wings slightly infumate with brown. Legs ( Fig. 11 ) predominantly brownish yellow; mid coxa brownish at base; hind coxae strongly darkened with brown basally; hind femur brownish centrally; fore and mid tibiae and tarsi brownish; hind tibia and tarsus blackish. Metasoma posterior to first tergite predominantly dark brown, ventrally brownish yellow, posterior margin of tergite 2 and distal end of metasoma brownish yellow ( Fig. 11 ).

Male. Unknown (see remarks below).

Etymology. The species is named after the fourth letter of the Greek alphabet (delta).

Distribution. Papua New Guinea.

Comparison. Female of D. delta sp. nov. differs from all Oriental and Oceanic congeners by the combination of its long and flat clypeus ( Fig. 12 ), notaulus with wrinkle, mesopleuron without foveate groove ( Fig. 17 ) and ovipositor apex strongly upcurved ( Fig. 18 ).

Remarks. Three males ( Fig. 19 ) are tentatively assigned with this species, but actually may represent a close undescribed taxon as they differ from the holotype female by the following features: clypeus broad and relatively large, about 2.8× as broad as long; head weakly rounded and strongly constricted behind eyes in dorsal view; flagellum constricted towards apex, with 23–25 flagellomeres; foveate groove of mesopleuron present as shallow and broad impression with weak transverse wrinkles; metacarpus (R1) shorter than in holotype female, not reaching tip of the wing; basal keel about as long as apical area; first tergite, in dorsal view, without spiracular prominences; tergites 1 and 2 very slender and long.

Figures

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 17–22. Diaparsis delta sp. nov., holotype, female (17, 18) and male (19): 17—head and mesosoma, lateral; 18— apex of ovipositor, lateral; 19—habitus (without wing apices), lateral. Diaparsis epsilon sp. nov., holotype, female: 20—head and mesoscutum, dorsal; 21—propodeum, dorsal; 22—apex of ovipositor, lateral.