Research Article |
Corresponding author: Mao-Ling Sheng ( shengmaoling@163.com ) Academic editor: Gavin Broad
© 2020 Tao Li, Shu-Ping Sun, Mao-Ling Sheng.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Li T, Sun S-P, Sheng M-L (2020) A new species of genus Rhinotorus Förster (Ichneumonidae, Ctenopelmatinae) parasitizing Pristiphora erichsonii (Hymenoptera, Tenthredinidae) and a key to Eastern Palaearctic species. Journal of Hymenoptera Research 77: 203-211. https://doi.org/10.3897/jhr.77.53323
|
A new species of Ctenopelmatinae, Rhinotorus nigrus Sheng, Li & Sun, sp. nov. reared from cocoons of Pristiphora erichsonii (Hartig) in Jilin Province, China, is described and illustrated. A key to Eastern Palaearctic species of Rhinotorus is provided.
Key, new species, Rhinotorus, Mesoleiini, taxonomy
The larch sawfly, Pristiphora erichsonii (Hartig) (Hymenoptera, Tenthredinidae), has been a significant pest of Larix spp. in China and other countries (
Rhinotorus Förster (Hymenoptera, Ichneumonidae, Ctenopelmatinae) comprises 15 species (
The species of Rhinotorus Förster were revised by
The diagnostic characters of Rhinotorus were described by
Nineteen host species of Rhinotorus from ten genera of Tenthredinidae have been recorded, 17 of them belong to subfamily Nematinae (
GSFGPM General Station of Forest and Grassland Pest Management, National Forestry and Grassland Administration, P. R. China;
NHMUK Natural History Museum, London, United Kingdom;
Cocoons of sawflies were collected under naturally infested trees in Mt. Maoer, belonging to the branch of Mt. Changbai (42°50'N, 129°28'E, elevation 375 to 400 m), Jilin Province. The forest stand is composed of mixed deciduous angiosperms mainly Quercus mongolica Fischer ex Ledebour and shrubs, with evergreen conifers – Pinus koraiensis Siebold et Zuccarini, P. tabuliformis Carr., and with deciduous conifers – Larix gmelinii (Rupr.) Kuzen., L. kaempferi (Lamb.) Carr., L. principis-rupprechtii Mayr. The detail methods according to
Images were taken using a Leica M205A stereo microscope with LAS Montage MultiFocus. Morphological terminology is mostly based on
Rhinotorus Förster, 1869
Rhinotorus Förster, 1869: 211. Type-species: Spudaea longicornis Schmiedeknecht.
1 | Third metasomal tergite without impression, granulate and impunctate. Coxae yellowish red. Hind tibia black basally and apically and whitish centrally. All tergites black. – Transpalaearctic species, in East: Yakutsk, Kamchatka ( |
Rh. umbrarum (Holmgren) |
– | Third metasomal tergite with distinct transverse impression, distinctly punctate. Coxae black. Hind tibia black in apical 0.3 or more with base usually yellowish brownish. Tergites black or some of them reddish | 2 |
2 | Median longitudinal carinae of propodeum (Fig. |
Rh. nigrus Sheng, Li & Sun, sp. nov. |
– | Median longitudinal carinae of propodeum from anterior margin to posterior transverse carina evidently convergent or divergent posteriorly; area petiolaris without distinct median longitudinal carina. Antennal flagellomeres brown. Hind femur brownish red | 3 |
3 | Median longitudinal carinae of propodeum from anterior margin to posterior transverse carina convergent posteriorly. Scutellum black. Metasomal tergites almost entirely black. – Transpalaearctic species, in East: Yakutsk ( |
Rh. compactor (Thunberg) |
– | Median longitudinal carinae of propodeum from anterior margin to posterior transverse carina divergent posteriorly. Scutellum yellow. Metasomal tergites 2 to 4 reddish brown. – Transpalaearctic species, in East: Kamchatka ( |
Rh. leucostomus (Gravenhorst) |
The specific name is derived from the entirely black mesosoma and metasoma.
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.
Postocellar line as long as ocular-ocellar line. Area petiolaris of propodeum high (Fig.
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.
Body length 6.0–7.0 mm. Fore wing length 6.0–6.5 mm.
Head. Inner orbits parallel. Face (Fig.
Mesosoma. Along anterior margin of pronotum (Fig.
Metasoma. First three tergites (Fig.
Colouration
(Fig.
Male. Unknown.
China (Jilin).
Pristiphora erichsonii (Hartig).
The new species is similar to Rh. jussilai Reshchikov, 2016, but can easily be distinguished from it by the following combinations of characters: occipital carina reaching hypostomal carina slightly above base of mandible; area petiolaris of propodeum with strong median longitudinal carina; hind femur black. Rhinotorus jussilai: occipital carina reaching hypostomal carina distinctly above base of mandible; area petiolaris of propodeum without median longitudinal carina; hind femur brownish red.
The new species is the only species of Rhinotorus recorded in the southeastern part of the Eastern Palearctic Region. The genus is not recorded in this part of Russia, in Korea and Japan. Nevertheless in the collections from the boreal and oriental part of China there are unidentified species of this genus. Rhinotorus need in further taxonomical research.
The authors are deeply grateful to Drs Gavin R. Broad (