Casinaria camura, Vas, 2019

Vas, Zoltán, 2019, Contributions to the taxonomy, identification, and biogeography of Casinaria Holmgren and Venturia Schrottky (Hymenoptera: Ichneumonidae: Campopleginae), Zootaxa 4664 (3), pp. 351-364 : 352-353

Casinaria camura sp. nov.

Material examined. Holotype: female, Mongolia, Central aimak , 126 km N v. Ulan-Baator am Wege, 1100m, 7.VII.1964, leg. Z. Kaszab, Nr. 278; specimen pinned, metasoma broken, broken part (from fourth metasomal segment to apex) card-mounted on the same pin, Id. No. HNHM-HYM 153111 .—The holotype specimen is deposited in the Hymenoptera Collection of HNHM (Budapest, Hungary).

Diagnosis. Casinaria camura sp. nov. shows a unique combination of characteristics within the genus, and can be easily identified by the combined presence of the following: transversal part of epicnemial carina strongly developed (it is a rather rare characteristic within the genus); occipital carina ventrally obsolescent, not bent outwards; second tergite less than 1.5× as long as its apical width; hind femur and hind tibia predominantly dark brown with basal ivory spot on hind tibia; metasoma black with second tergite subapically narrowly reddish, third and fourth tergites entirely reddish. Among the Western Palaearctic species of the genus the new species is most similar to C. moesta (Gravenhorst) or to C. scabra Thomson in colouration and body proportions; it differs from both species by the presence of transversal part of epicnemial carina, and additionally it differs from the former species by the lack of nose-like projection on clypeus, and from the latter species by colouration of hind femur and tibia. Another Palaearctic species with well-developed transversal part of epicnemial carina and with partly similar colouration is C. nigripes (Gravenhorst) , however the occipital carina of this species is complete and strongly bent out, second tergite twice or more as long as its apical width, several wing vein characteristics differ, and body is significantly longer. Among the Eastern Palaearctic and Oriental species of the genus the new species is most similar to C. atrata Morley regarding the structure of epicnemial carina and hind leg colouration; however, the colouration of this species is wholly black (except palpi and basal spot of hind tibia).

Description. Female ( Figs 1–3 ). Body length ca 8.5 mm, fore wing length ca 5 mm.

Head: Antenna with 31 flagellomeres; basal flagellomeres relatively stout, first flagellomere 2.3× as long as wide apically; preapical flagellomeres longer than wide. Head transverse, finely rugose-punctate, matt, with dense, greyish hairs. Ocular-ocellar distance slightly shorter than ocellus diameter, posterior ocellar distance almost twice as long as ocellus diameter. Inner eye orbits indented and weakly convergent ventrally. Gena (temple) short, strongly narrowed behind eye, in dorsal view about 0.5× as long as eye width, ventrally weakly concave. Occipital carina ventrally obsolescent, not bent outwards; hypostomal carina slightly elevated. Malar space 0.4× as long as basal width of mandible. Face flat in profile, narrowed ventrally, minimal width of face 0.65× as long as eye length and 0.85× as long as width of frons. Clypeus flat, very weakly separated from face, weakly convex in profile, apical margin convex, sharp. Mandible short, high, lower margin of mandible with wide flange from teeth toward base, mandibular teeth of equal length.

Mesosoma: Mesosoma granulate to finely rugose with dense, superficial punctures, and with dense, relatively long, greyish hairs. Pronotum with transverse wrinkles in ventral half; epomia strong. Mesoscutum convex in pro- file, about 0.9× as long as wide, notaulus not developed. Scuto-scutellar groove deep. Scutellum convex in profile, basal half with distinct lateral carina. Mesopleuron with transverse wrinkles along anterior margin and anterior to speculum; speculum granulate, matt; mesopleural suture deep with strong transverse costae. Pleural part of epicnemial carina very weak, obsolescent, bent to anterior margin of mesopleuron reaching it below its middle height; transversal part of epicnemial carina (i.e. part at the level of sternaulus running through the epicnemium to the ventral edge of pronotum) strongly developed and slightly elevated; ventral part of epicnemial carina (behind fore coxae) complete, normal, not elevated. Sternaulus indistinct. Posterior transverse carina of mesosternum complete. Metanotum short, about 0.5× as long as scutellum. Metapleuron rugose, punctures indistinct; juxtacoxal carina indistinct; submetapleural carina complete, strong. Pleural carina of propodeum strong; propodeal spiracle elliptic, separated from pleural carina by about its length, connected to pleural carina by a ridge. Propodeum coarsely rugose, its apex reaching about middle length of hind coxa. Propodeal carinae mostly indistinct, only carinae bordering about basal half of area superomedia distinct. Area basalis very narrow, inconspicuous; area superomedia very wide, distinctly wider than long, confluent with area petiolaris. Area superomedia and area petiolaris rather deeply and widely impressed with strong transverse wrinkles all along the impression. Fore wing with relatively large, very short-stalked, almost sessile areolet, second recurrent vein (2 m-cu) distal to its middle, posterior third of 3 rs-m weakly pigmented; distal abscissa of Rs straight, its extreme distal part very weakly curved; nervulus (cu-a) strongly postfurcal, by about 0.20–0.25× its length; postnervulus (abscissa of Cu 1 between 1 m-cu and Cu 1a + Cu 1b) intercepted below middle by Cu 1a; lower external angle of second discal cell almost right-angled. Pterostigma long and narrow. Hind wing with nervellus (cu-a + abscissa of Cu 1 between M and cu-a) about vertical, not intercepted; discoidella (distal abscissa of Cu 1) spectral, proximally absent. Coxae finely granulate with dense, weak, superficial punctures. Hind femur 3.9× as long as high. Inner spur of hind tibia about 0.8× as long as first tarsomere of hind tarsus. Tarsal claws small and short, little longer than arolium, with 2–3 basal pecten.

Metasoma: Metasoma finely granulose with short greyish hairs. First tergite relatively long and slender, almost 3× as long as its apical width, 1.3× as long as second tergite, slightly shorter than hind femur, without glymma; dorsomedian carina of first tergite indistinct; basal, lateral and ventral parts of petiolus smooth, other part finely granulate, postpetiolus finely granulate; petiolus about 3.3× as long as high. Suture separating first tergite from first sternite situated above mid-height at basal third of first metasomal segment. Second tergite relatively stout, 1.3× as long as its apical width; thyridium long oval, its distance from basal margin of tergite about 1.2× as long as its length. Third tergite 0.8× as long as its apical width, following tergites all wider than long, medially not excised. Ovipositor sheath short, barely reaching metasomal apex; ovipositor thin, dorsal preapical notch indistinct.

Colour: Antenna blackish to dark brown. Head black except palpi brown to yellowish brown and mandibular teeth dark reddish brown. Mesosoma black except tegula proximally dark brown, distally yellowish. Metasoma: first tergite black, second tergite black with a narrow subapical reddish band, third and fourth tergites entirely reddish, following tergites black; ovipositor sheath dark brown. Wings hyaline, wing veins and pterostigma brown. Fore leg: coxa, trochanter and trochantellus black; femur entirely reddish; tibia externo-medially light yellowish, interno-medially reddish yellow; tarsus yellowish, apical tarsomeres darkened. Middle leg: coxa, trochanter and trochantellus black; femur entirely reddish; tibia light reddish with small basal ivory spot; tarsus reddish, apical tarsomeres darkened. Hind leg: coxa, trochanter and trochantellus black; femur predominantly dark brown, ventrally dark reddish brown, apically blackish; tibia dark brown with basal ivory spot; tarsus dark brown except basal 0.1 of first tarsomere yellowish.

Male: Unknown.

Distribution. Currently known from Mongolia.

Ecology. No host is known. Most probably a koinobiont endoparasitoid of lepidopterous hosts as other Casinaria species.

Etymology. The specific epithet camura is the feminine form of the Latin adjective camurus, -a, -um meaning curved or arched inward; it refers to the well-developed transversal part of the epicnemial carina.

Remarks. By using the identification key of the most recent revision of Western Palaearctic Casinaria species ( Riedel 2018), C. camura sp. nov. runs to couplet 27 together with C. scabra and C. moesta but without further matching to either half of the couplet. The distinctive characteristics from these species are given in the Diagnosis section.

Figures

FIGURES 1–3. Casinaria camura sp. nov.: 1, female, holotype; 2, metasoma of holotype from fourth tergite to apex (cardmounted on the same pin); 3, epicnemial carina (transversal part arrowed, specimen facing left).