Rhinotorus nigrus Sheng, Li & Sun, 2020

Li, Tao, Sun, Shu-Ping & Sheng, Mao-Ling, 2020, A new species of genus Rhinotorus Foerster (Ichneumonidae, Ctenopelmatinae) parasitizing Pristiphora erichsonii (Hymenoptera, Tenthredinidae) and a key to Eastern Palaearctic species, Journal of Hymenoptera Research 77, pp. 203-211 : 203

Rhinotorus nigrus Sheng, Li & Sun sp. nov.

Figures 1-9

Etymology.

The specific name is derived from the entirely black mesosoma and metasoma.

Material examined.

Holotype, female, reared from cocoon of Pristiphora erichsonii (Hartig) in Mt. Maoer , Yanji, Jilin Province, China by Tao Li on 24 May 2009 . Paratypes: 3 females, same data as holotype except 25 May-5 June 2009 .

Diagnosis.

Postocellar line as long as ocular-ocellar line. Area petiolaris of propodeum high (Fig. 7 ) with strong median longitudinal carina and irregular oblique longitudinal wrinkles. First and second tergites (Fig. 8 ) with distinct subposterior transverse depressions. First tergite approximately 0.8 × as long as posterior width. Head except clypeus, mesosoma, metasoma (Fig. 8 ), and hind leg (Fig. 1 ) black, except that basal 0.3 of hind tibia brownish and its spurs white.

Description.

Body length 6.0-7.0 mm. Fore wing length 6.0-6.5 mm.

Head. Inner orbits parallel. Face (Fig. 2 ) approximately 1.9 × as wide as long, slightly evenly convex, lateral portion shagreened, upper-median portion with distinct punctures; lower-median portion with indistinct punctures; upper margin with median small tubercle. Clypeus approximately 2.4 × as wide as long, smooth, shiny, with sparse shallow indistinct punctures, apical median portion convex; median section of apical margin distinctly depressed. Basal portion of mandible with dense indistinct punctures; upper tooth sharper and slightly longer than lower tooth. Malar area and vertex (Fig. 4 ) shagreened. Malar space approximately 0.5 × as long as basal width of mandible. Postocellar line approximately same length as ocular-ocellar line. Gena (Fig. 3 ) with fine punctures. Frons (Fig. 5 ) slightly convex medially, with dense fine punctures. Antenna with 31 flagellomeres; ratio of length from first to fifth flagellomeres approximately: 6.5:4.0:3.5:3.5:3.0. Occipital carina reaching hypostomal carina slightly above base of mandible.

Mesosoma. Along anterior margin of pronotum (Fig. 6 ) with dense fine punctures; lateral concavity with weak oblique transverse wrinkles; upper-posterior portion with dense fine punctures. Mesoscutum, scutellum and postscutellm with fine punctures. Notauli reaching beyond middle. Scutoscutellar groove almost shiny. Mesopleuron (Fig. 6 ) slightly shagreened, upper-median portion with fine transverse wrinkles; speculum shiny, smooth. Upper end of epicnemial carina approximately reaching to 0.6 distance to subtegular ridge. Metapleuron evenly convex, with dense punctures; lower posterior portion with oblique wrinkles. Ratio of length of hind tarsomeres from first to fifth approximately: 10.0:5.0:3.5:2.0:2.5. Wings hyaline. Fore wing with vein 1cu-a slightly distal to M&RS. Postnervulus intercepted at lower 0.4. Hind wing vein 1-cu approximately 1.5 × as long as cu-a. Propodeum (Fig. 7 ) with complete strong median longitudinal and posterior transverse carinae; median longitudinal carinae almost parallel; between median longitudinal carinae and area petiolaris shiny, remain areae with dense distinct punctures; area petiolaris with strong median longitudinal carina and irregular oblique longitudinal wrinkles. Propodeal spiracle small, circular, located at basal 0.25.

Metasoma. First three tergites (Fig. 8 ) with dense punctures. Subposterior portions of first and second tergites with weak transverse depressions. First tergite approximately 0.8 × as long as posterior width, with irregular short wrinkles; dorsal median carina reaching to 0.6 length of first tergite; dorsolateral and ventrolateral carinae complete; postpetiole strongly convex; spiracle small, circular, convex, located approximately at anterior 0.4 of first tergite. Second and third tergites (Fig. 8 ) approximately 0.5 × as long as posterior width. Fourth and subsequent tergites with relatively sparse fine punctures. Ovipositor sheath (Fig. 9 ) approximately 2.3 × as long as its maximum width, from middle evenly narrowed posteriorly.

Colouration (Fig. 1 ). Black, except for following: clypeus, maxillary palpi, labial palpi, malar area, upper-posterior corners of pronotum, tegulae yellowish brown; mandible except base and teeth, fore and middle femora, tibiae and tarsi, apexes and bases of hind femora red brown; ventro-basal portions of hind tibiae brownish yellow; antennae, pterostigma and veins brownish black. Second and third metasomal sternites black brown.

Male. Unknown.

Distribution.

China (Jilin).

Host.

Pristiphora erichsonii (Hartig).

Figures

Figures 1 - 9. Rhinotorus nigrus Sheng, Li & Sun, sp. nov. Holotype, female 1 habitus and host's cocoon, lateral view 2 head, anterior view 3 head, lateral view 4 head, dorsal view 5 head, dorsoanterior view 6 mesosoma, lateral view 7 propodeum 8 metasoma, dorsal view 9 apical portion of metasoma, lateral view.