Diaparsis (Diaparsis) zeta 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 : 76-79

10. Diaparsis (Diaparsis) zeta Khalaim & Villemant , sp. nov.

( Figs 54–59 )

Material examined. Holotype female ( MNHN) PNG, Madang Prov., 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.

Paratypes. PNG, Madang Prov.: 1 ♀ ( MNHN) Mt. Wilhelm (-5.741031, 145.3294), 200 m, 28–30.X.2012, leg. Dilu, Ray, Novotny & Leponce, understorey; FIT-MW200-L-2/8-d04, P0797-846 (head absent) . 2 ♀, 1 ♂ (1 ♀, 1 ♂ — MNHN; 1 ♀ — ZISP) same data, but FIT-MW200-K-2/8-d04, P0789-576 . 1 ♀ ( MNHN) Mt. Wilhelm (-5.720874, 145.2695), 1200 m, 26–27.X.2012, leg. Philip, Alois, Novotny & Leponce, Plot 1, understorey; MAL- MW1200A-02/16-d02, P1779-11298 .

Description. Female. Body length about 3.2 mm. Fore wing length 2.5 mm.

Head roundly constricted behind eyes in dorsal view (as in Fig. 4 ); gena 0.45× as long as eye width. Clypeus broad, lenticular, 2.4× as broad as long, slightly convex in lateral view, with very shallow transverse ridge in lower 0.3; clypeus separated from face by thin and sharp impression, smooth, with fine punctures in upper half. Mandible slender, weakly constricted in basal half, with upper tooth 2.5–3.0× as long as lower tooth. Malar space 0.8–0.9× as long as basal mandibular width ( Fig. 56 ). Antennal flagellum ( Figs 55 , 59 ) weakly constricted towards apex, with 18–20 flagellomeres (20 in holotype); subbasal flagellomeres 1.6–1.8× and subapical flagellomere 1.4–1.6× as long as broad; flagellomeres 4 to 6 bearing subapical finger-shaped structures on outer surface. Face weakly and evenly convex, with slight nearly smooth median prominence centrally. Face and frons with fine and dense punctures on finely granulate and dull background (punctures partly indistinct because of granulation). Vertex finely and shallowly granulate, dull, impunctate or with very fine punctures. Gena shallowly granulate, centrally almost smooth, weakly shining, impunctate or with fine punctures. Occipital carina complete, evenly arcuate in dorsal view. Hypostomal carina absent at least in lower part, not reaching occipital carina.

Mesoscutum very shallowly granulate, weakly shining, with fine punctures; mesopleuron finely granulate peripherally and more or less smooth centrally, finely punctate (punctures usually distinct and vanishing peripherally); dorsolateral area of propodeum very shallowly granulate, weakly shining, impunctate or with very fine and sparse punctures. Notaulus with longitudinal wrinkle on anterolateral side of mesoscutum. Scutellum with lateral longitudinal carinae present in basal 0.2. Foveate groove extending in anterior 0.5–0.6 of mesopleuron, strongly oblique, straight, broad and deep, with transverse wrinkles ( Fig. 56 ). Propodeum with basal keel 0.5–0.7× as long as apical area (0.5× in holotype). Propodeal spiracle small, separated from pleural carina by about 3.0× diameter of spiracle ( Fig. 56 ). Apical area flat, more or less pointed anteriorly (as in Fig. 37 ); apical longitudinal carinae complete, 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 angle. Intercubitus (2rs-m) thick and short, 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) weakly reclivous. Legs slender; tarsal claws not pectinate.

First tergite 3.5× as long as posteriorly broad, slightly trapeziform in cross-section centrally, smooth, with small isolated glymma somewhat behind centre of tergite (in holotype and one paratype) or without glymma (in two other paratypes); in dorsal view, petiole with lateral margins more or less parallel, and postpetiole distinctly and evenly widened from base to apex; upper margin of tergite, in lateral view, slightly arcuate in basal 0.7 and stronger arcuate in apical 0.3 ( Fig. 56 ). Second tergite 1.2× as long as anteriorly broad. Thyridial depression shallow, about 1.5× as long as broad, with posterior end rounded. Ovipositor slender, weakly bent upwards over its total length, with shallow dorsal subapical depression and weak rounded tooth before this depression ( Fig. 57 ); sheath about 1.2× as long as first tergite.

Head, mesosoma and first tergite dark reddish brown to almost black. Palpi and mandible (teeth dark reddish brown) yellow. Lower 0.3–0.5 of clypeus yellow or reddish brown. Scape and pedicel of antenna yellowish brown, dorsally sometimes darkened; flagellum uniformly black ( Fig. 55 ). Tegula brown. Pterostigma brown, sometimes with weak pale marks at proximal and distal corners. Wings slightly infumate with brown. Legs ( Fig. 54 ) predominantly yellow to brownish yellow, more or less brown-marked on hind coxa and all femora (especially on hind femur), and tibiae and tarsi infuscate. First tergite brown to dark brown. Metasoma posterior to first tergite predominantly brown, ventrally and posteriorly sometimes pale brown or yellowish ( Fig. 54 ).

Male. Mandible with upper tooth 2.5× as long as lower tooth. Antennal flagellum distinctly constricted towards apex (apices of both flagella absent). First and second tergites longer than in female. First tergite round in crosssection centrally, smooth dorsally and with fine striae laterally; upper margin evenly convex in lateral view; weakly and evenly widened from base to apex in dorsal view (i.e. postpetiole not separated from petiole); glymma absent. Thyridial depression twice as long as broad. Otherwise similar to female.

Variation. One paratype female (P1779-11298) possesses metasoma extensively white at its distal end ( Fig. 58 ); otherwise this specimen well corresponds with other material of this species.

Etymology. The species is named after the sixth letter of the Greek alphabet (zeta).

Distribution. Papua New Guinea.

Comparison. Diaparsis zeta sp. nov. differs from all other PNG species of Diaparsis having notaular wrinkle by the combination of short second tergite, constricted towards apex antennal flagellum ( Fig. 55 ), and relatively short unspecialized ovipositor ( Fig. 57 ).

Figures

FIGURES 54–57. Diaparsis zeta sp. nov., holotype, female: 54—habitus, lateral; 55—head with antenna and mesoscutum, dorso-antero-lateral; 56—head, mesosoma and base of metasoma, lateral; 57—ovipositor, lateral.

FIGURES 58–59. Diaparsis zeta sp. nov., paratype, female: 58—habitus, lateral; 59—antenna, lateral.

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 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.