Diaparsis (Diaparsis) gamma 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 : 68-69

6. Diaparsis (Diaparsis) gamma Khalaim & Villemant , sp. nov.

( Figs 33–38 )

Material examined. Holotype female ( MNHN) PNG, Madang Prov., Mt. Wilhelm (-5.741031, 145.3294), 200 m, 9–10.XI.2012, leg. Dilu, Ray, Novotny & Leponce, Plot 2, understorey; MAL-MW0200B-16/16-d16, P1029- 11974.

Paratypes. PNG, Madang Prov.: 1 ♀ ( ZISP) Wanang 3 Station (-5.22767, 145.0797), 175 m, 12–13.IX.2012, leg. Basset, Plot 3, understorey; MAL-WAN03-D06, P0048-1081 . 1 ♀ ( MNHN) Mt.Wilhelm (-5.720874, 145.2695), 1200 m, 28–29.V.2013, leg. Sam et al., Plot 3, understorey; MAL-MW1200’C-16/16-d16, P4812-20972 .

Description. Female. Body length 4.1 mm. Fore wing length 2.7 mm.

Head roundly constricted behind eyes in dorsal view; gena short, about half as long as eye width. Clypeus about 3.2× as broad as long, lenticular ( Fig. 35 ), separated from face by shallow groove, smooth, with distinct punctures in upper half, convex in lateral view. Mandible slender, weakly constricted in basal half; upper tooth 2.5–3.0× longer than lower tooth. Malar space 0.7–0.8× as long as basal mandibular width ( Fig. 34 ). Antennal flagellum ( Fig. 34 ) filiform, with 17–18 flagellomeres; subbasal flagellomeres 1.3–1.5× and subapical flagellomeres about 1.2× as long as broad; flagellomeres 4 to 6 bearing subapical finger-shaped structures on outer surface ( Fig. 34 ). Face weakly convex, without distinct median prominence. Face and frons with fine and dense punctures on finely granulate and dull background. Vertex shallowly granulate, with very fine and sparse punctures, or impunctate. Gena smooth and shining, impunctate. Occipital carina complete. Hypostomal carina present in upper half and completely absent in lower part, not reaching occipital carina.

Mesoscutum, mesopleuron and dorsolateral area of propodeum very shallowly granulate (partly almost smooth), weakly shining, with distinct and moderately dense punctures. Notaulus with distinct longitudinal wrinkle on anterolateral side of mesoscutum, with deep pit beyound the wrinkle ( Fig. 36 ). Scutellum with lateral longitudinal carinae present in basal 0.3–0.4. Upper end of epicnemial carina abruptly curved to reach anterior margin of mesopleuron. Foveate groove extending in anterior half of mesopleuron, strongly oblique, broad, deep in holotype and shallow in paratypes, with distinct transverse wrinkles ( Fig. 36 ). Propodeum with distinct basal keel which is half as long as apical area ( Fig. 37 ). Propodeal spiracle slightly enlarged, separated from pleural carina by 2.0–3.0× diameter of spiracle ( Fig. 36 ). Apical area flat, finely punctate on granulate or nearly smooth background, more or less pointed anteriorly ( Fig. 37 ); apical longitudinal carinae distinct, reaching transverse carina anteriorly ( Fig. 37 ).

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 slightly acute angle. Intercubitus (2rs-m) short and thick, much 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. Hind wing with nervellus (cu1&cu-a) reclivous, slanted about 70° from horizontal. Legs slender; tarsal claws long, not pectinate.

First tergite slender, 5.2× as long as posteriorly broad, round in cross-section centrally, entirely polished, without glymma ( Fig. 36 ); 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 and arcuate in apical 0.4 ( Fig. 33 ). Second tergite 2.3–2.6× as long as anteriorly broad. Thyridial depression deep, 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 shallow dorsal subapical depression ( Fig. 38 ); sheath 2.2× as long as first tergite in holotype and 1.3–1.4× in paratypes.

Head and mesosoma black. Palpi and mandible (teeth dark red) brownish yellow; lower half of clypeus brownish yellow to reddish brown. Scape and pedicel of antenna brownish yellow to pale brown; flagellum brownish black, somewhat paler basally and with 4–6 distal flagellomeres white ( Fig. 34 ). Tegula and pterostigma brown. Wings slightly infumate with brown. Legs predominantly yellow-brown; all coxae, bases of femora, hind femur and tibia partly or entirely brown. First metasomal tergite dark reddish brown to brownish black; following tergites brown to dark brown, with posterior margins and ventral sides sometimes yellowish.

Male. Unknown.

Etymology. The species is named after the third letter of the Greek alphabet (gamma).

Distribution. Papua New Guinea.

Comparison. Diaparsis gamma sp. nov. is similar to D. alba Khalaim & Villemant as both have antennal flagellum with distal end white ( Fig. 34 ) but differs from this species in having notaulus with distinct wrinkle ( Fig. 36 ), robust flagellum with 17–18 flagellomeres (slender, with 15 flagellomeres in D. alba ), subapical finger-shaped structures on flagellomeres 4 to 6 (on flagellomeres 1 and 2 in D. alba ), broader clypeus ( Fig. 35 ) and much longer thyridial depression.

Figures

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.