Cymodusa irata, Vas, 2022

Vas, Zoltán, 2022, Contributions to the taxonomy, identification, and biogeography of the Palaearctic species of Cymodusa Holmgren (Hymenoptera: Ichneumonidae: Campopleginae), Zootaxa 5162 (3), pp. 268-276 : 269-272

Cymodusa irata sp. nov.

Type material. Holotype: female, “ Turkmenistan, Kopet-Dagh Mts. , Bikrova, 300m, 6.IV.1993, No L83, 58°08’E, 37°59’N, leg. M. Hreblay, Gy. László, A. Podlussány ”; specimen card-mounted, Id. No. HNHM-HYM 155125 . Paratypes: 3 females and 6 males, same locality and collecting data; specimens card-mounted, Id. No. HNHMHYM 155126–155134, respectively. The holotype and the paratypes are deposited in the Hymenoptera Collection of HNHM .

Diagnosis. The new species can be distinguished from all known Cymodusa species by the following character states in combination: eyes of female very strongly convergent ventrad, their maximum distance 2.9–3.0× as long as minimum distance; anterior tentorial pits of female strongly reduced, touching eyes; gena weakly narrowed behind eyes; malar space of female 0.1× as long as basal width of mandible; propodeal spiracle small, circular, separated from pleural carina by less than its length; propodeum granulate with short, transverse wrinkles in area basalis, and with weak, mostly transverse rugosity on posterior half; longitudinal propodeal carinae complete, median sections of anterior and posterior transverse carinae and costulae absent; area superomedia narrow, 1.2–1.5× as long as wide, anteriorly and posteriorly opened; area petiolaris strongly widened posteriorly; fore wing with subsessile to very short-stalked areolet, 2 m-cu very strongly proximal to middle of areolet; nervellus weakly broken, intercepted, discoidella present; posterior margins of sixth and seventh tergites medially strongly excised; ovipositor sheath 0.7–0.8× as long as hind tibia; body black, tegula yellowish, posterior margins of metasomal tergites inconspicuously suffused with dark brown; hind femur dark chestnut-brown, hind tibia orange-brown, basally and externomedially paler, subbasally and apically darker in females; colouration of legs usually somewhat darker in males than in females.

Description. Female ( Figs 1–4 ). Body length 5–6 mm, fore wing length 3.9–4.1 mm.

Head: Antenna with 25–26 flagellomeres; first flagellomere ca. 4× as long as its apical width; preapical flagellomeres little longer than wide. Head transverse, matt, granulate without punctures, and with moderately long hairs. Eyes large, distinctly hairy; inner eye orbits slightly indented, very strongly convergent ventrad, their maximum distance 2.9–3.0× as long as minimum distance ( Fig. 2 ). Ocelli small, ocular-ocellar distance 1.4× as long as ocellus diameter, distance between lateral ocelli 1.8–2.0× as long as ocellus diameter. Gena in dorsal view 0.55–0.60× as long as eye width, weakly narrowed behind eyes. Occipital carina complete, dorsomedially evenly arched, ventrally slightly weakened and reaching hypostomal carina little before base of mandible; hypostomal carina slightly elevated. Frons flat, impressed above toruli, median longitudinal carina absent. Face and clypeus flat in profile, clypeus very weakly separated from face, its apical margin convex, sharp; anterior tentorial pits strongly reduced, touching eyes. Malar space 0.1× as long as basal width of mandible. Mandible relatively short, lower margin with narrow carina from base towards teeth, carina gradually narrowed before teeth; mandibular teeth of about equal length.

Mesosoma: Mesosoma matt, granulate, not punctate except some indistinct traces of sparse punctures on mesoscutum and scutellum, and with short, dense hairs. Pronotum with strong transverse wrinkles on lower two-third, epomia distinct. Mesoscutum slightly longer than wide, convex in profile; notaulus not developed. Scuto-scutellar groove wide and moderately deep. Scutellum convex in profile, lateral carina not developed. Mesopleuron granulate with weak wrinkles anterior to speculum; speculum smooth, shiny. Epicnemial carina strong, pleural part bent to anterior margin of mesopleuron reaching it below its middle height, transversal part (i.e., the part at the level of sternaulus running through the epicnemium to the ventral edge of pronotum) not developed, ventral part (behind fore coxae) complete, normal, not elevated. Sternaulus indistinct. Posterior transverse carina of mesosternum complete. Metanotum 0.5× as long as scutellum. Metapleuron without juxtacoxal carina; submetapleural carina complete, elevated. Pleural carina of propodeum complete; propodeal spiracle small, circular, separated from pleural carina by less than its length, connected to pleural carina by an indistinctly weak ridge. Propodeum convex in profile, granulate with short, transverse wrinkles in area basalis, and with weak, mostly transverse rugosity on posterior half of propodeum. Propodeal carinae ( Fig. 4 ): lateromedian and lateral longitudinal carinae complete; anterior transverse carina (including median section and costulae) entirely absent; posterior transverse carina strong except median section absent. Area basalis elongate rectangular, ca. 1.7–2.1× as long as its basal width, posteriorly opened, confluent with area superomedia, and densely covered with transverse wrinkles (these not to be confused with the absent median section of anterior transverse carina). Area superomedia entirely granulate, narrow and elongate, 1.2–1.5× as long as wide, posteriorly opened, its lateral sides weakly divergent posteriorly. Area petiolaris confluent with area superomedia, granulate with weak, mostly transverse rugosity, strongly widened posteriorly, and medially slightly impressed. Fore wing with subsessile to very short-stalked, rectangular areolet, 3 rs-m present, second recurrent vein (2 m-cu) very strongly proximal to middle of areolet (M between 2 m-cu and 3 rs-m 1.7–2.1× as long as M between 2 m-cu and 2 rs-m) ( Fig. 3 ); distal abscissa of Rs almost straight, its distal part weakly curved towards wing margin; nervulus (cu-a) interstitial, vertical to slightly inclivous; postnervulus (abscissa of Cu 1 between 1 m-cu and Cu 1a + Cu 1b) intercepted below its middle by Cu 1a; lower external angle of second discal cell about right-angled. Hind wing with nervellus (cu-a + abscissa of Cu 1 between M and cu-a) about vertical, weakly broken and intercepted by discoidella (Cu 1) close to its posterior end; discoidella spectral, proximally connected to nervellus. Coxae finely granulate. Hind femur in profile ca. 5.5× as long as wide. Inner spur of hind tibia ca. 0.4× as long as first tarsomere of hind tarsus. Tarsal claws thin, longer than arolium, without distinct basal pectines.

Metasoma: Metasoma moderately compressed, finely granulate to shagreened, and with dense, short hairs. First tergite slender, ca. 3.2× as long as width of its apical margin, as long as second tergite, without glymma; dorsomedian carinae of first tergite indistinctly weak; postpetiolus weakly bulging. Second tergite 1.5× as long as its apical width; thyridium elongate oval, its distance from basal margin of tergite 1.6–2.1× as long as its length, connected to basal margin of tergite by a weak ridge. Posterior margins of sixth and seventh tergites medially strongly excised. Ovipositor sheath 0.7–0.8× as long as hind tibia; ovipositor compressed, straight.

Colour: Antenna, including scapus and pedicellus, blackish to dark brown. Head black, palpi yellowish, mandible yellowish except basally narrowly blackish and teeth brownish. Mesosoma black, except tegula yellow, rarely light yellowish brown. Metasoma black, posterior margins of tergites inconspicuously, sometimes barely discernibly suffused with dark brown. Wings hyaline, wing veins and pterostigma brown. Fore leg: coxa basally dark brown, apically yellowish brown; trochanter orange, dorsally darkened, apically narrowly yellowish; trochantellus yellowish orange; femur and tibia orange, tibia externo-medially paler; tarsus orange-brown, apical tarsomeres brown. Middle leg: coxa black, apically narrowly yellowish brown; trochanter brownish to blackish, apically more or less yellowish; trochantellus yellowish to yellowish brown; femur brownish orange, basally more or less darkened; tibia orange-brown, externo-medially paler; tarsus brown. Hind leg: coxa black, apically very narrowly yellowish brown; trochanter black, apically narrowly yellowish; trochantellus yellowish brown to brownish; femur dark chestnutbrown; tibia orange-brown, externo-medially paler, basally with a small, inconspicuous pale spot, subbasally and apically brown; tarsus brown.

Male ( Fig. 5 ): Similar to female in characters described above, except: antenna with 27–30 flagellomeres; eyes weakly convergent ventrad, their maximum distance 1.3–1.4× as long as minimum distance ( Fig. 5 ); ocular-ocellar distance 1.1–1.3× as long as ocellus diameter; gena in dorsal view 0.6–0.7× as long as eye width; clypeus with weak traces of punctures; anterior tentorial pits normal, not touching eyes; malar space 0.6× as long as basal width of mandible; hind femur in profile slightly stouter, ca. 5× as long as wide; second tergite slenderer, 1.7–1.9× as long as its apical width; thyridium smaller, its distance from basal margin of tergite 2.1–2.6× as long as its length; posterior margins of sixth and seventh tergites medially not excised; colouration of legs usually somewhat darker than in female, hind femur dark brown to blackish, hind tibia dark brown subbasally, apically and ventrally.

Distribution. Turkmenistan (Eastern Palaearctic region).

Etymology. The specific epithet irata is the feminine form of the Latin adjective iratus, -a, -um, meaning angry or wrathful, referring to the “facial expression” of the new species with the very strongly convergent eyes.

Remarks on identification. The new species belongs to the “australis” species group recognised by Dbar (1985), characterised by the strongly convergent eyes, very short malar space, reduced anterior tentorial pits, medially strongly excised sixth and seventh tergites, and position of 2 m-cu proximal to middle of areolet. Among the Palaearctic species of the “australis” group, due to the very strongly convergent eyes of females and partial similarities in propodeal carination, the new species is somewhat similar to the Western Palaearctic species Cymodusa propodeata Kolarov et Yurtcan , and, to a much lesser extent, to the Eastern Palaearctic species Cymodusa japonica Watanabe. The former species can be readily distinguished from the new species by its distinctly developed costulae and widely reddish posterior margins of second and third tergites, while the latter species by its distinctly longer ovipositor sheath (0.95–1.0× as long as hind tibia), narrower area petiolaris, and presence of median section of anterior transverse carina. Among the Oriental species of the “australis” group, the new species is somewhat similar to Cymodusa dravida Gupta et Gupta , which can be easily distinguished from the new species by its extensively reddish third tergite, entirely reddish fourth tergite and hind tibia, and developed costulae.

Figures

FIGURES 1–8. Morphological details of Cymodusa species. 1–5, Cymodusa irata sp. nov.; 1, habitus (holotype); 2, head, female; 3, areolet; 4, propodeum; 5, head, male; 6, Cymodusa nigra Šedivý, propodeum; 7–8, Cymodusa australis (Smits van Burgst), propodeum, variations.