Rhinotorus similis ( Brischke, 1892 )

Reshchikov, Alexey V., 2016, A revision of the genus Rhinotorus Förster, 1869 (Hymenoptera, Ichneumonidae, Ctenopelmatinae), with descriptions of three new species and an illustrated identification key, European Journal of Taxonomy 235 (235), pp. 1-40 : 28-30

Rhinotorus similis ( Brischke, 1892)

Fig. 12

Mesoleius similis Brischke, 1892: 35–36 .

Diagnosis

This species is distinguished from other species in the genus by the following characters: female face with yellow coloration ( Fig. 12A ); female with ramulus on the 1m-cu present ( Fig. 12C ); propodeum with area basalis and area superomedia distinctly separated by carina ( Fig. 12B ); metasoma partly reddish.

Material examined

AUSTRIA: 1 Ƌ, Wachau, ex. Cladius pectinicornis (Geoffroy, 1785) , BMNH.

FINLAND: 1 Ƌ, northern Ostrobothnia, Kuusamo, Jäkälämutka, 735:61, 1 Jul. 1997, leg. R Jussila, ZMUT; 2 ƋƋ, Vihti, Siikajäarvi, 12 Jun. 1958, leg. V.J. Karvonen, MZH; 1 Ƌ, Vihti, Siikajäarvi, 6 Jun. 1964, leg. V.J. Karvonen, MZH; 1 Ƌ, Espoo, 29 Jun. 1978, leg. O. Ranin, MZH.

FRANCE: 1 ♀, ZMUC.

SWEDEN: 1 Ƌ, NHRS-HEVA 000002066, NHRS.

Description

Female

Fore wing around 7–8 mm long. Antenna slender, around 0.8 times as long as fore wing, with 28 flagellomeres. Ratio of length of 1 st plus 2 nd flagellomeres to eye height 1.1. Scape as broad as long. Head not narrowed behind eyes, matt and shagreened, without punctures. Lateral ocellus separated from eye margin by 1.5 times their widest diameter. Face transverse, 2.2 times as wide as high, shagreened and parallel sided ( Fig. 10A ). Clypeus 0.35 times as high as wide, distinctly separated from face by deep impression, slightly projecting medially, shining and sparsely punctate, its apical margin weakly obtuse medially and impressed laterally. Clypeal fovea rather deep. Malar space as long as 0.7 basal mandible width. Occipital carina complete. Mandible teeth of equal length.

Mesoscutum matt and finely granulate. Notaulus distinct. Mesopleuron matt and shagreened, with striation in upper part. Metapleuron matt with dense punctation. Propodeum matt and shagreened ( Fig. 12B ). Area superomedia separated from area basalis by distinct carina. Costula absent. Area apicalis trapezoidal, 0.4 times as long as broad and with longitudinal carina. Spiracles weakly oval, 1.2 times as long as broad. Hind femur 4.7 times as long as broad. Hind tibia 7 times as long as apically broad. First tarsomere of hind leg 8.8 times as long as broad and 1.9 times as long as second tarsomere. Claws not pectinate. Fore wing with pterostigma around 3.6 times as long as broad and intercepted by Rs before its middle. Female with ramulus on the 1m-cu present ( Fig. 12C ). 2m-cu straight, with a single bulla. Cu-a weakly inclival, postfurcal. Hind wing with cu-a intercepted far below middle and almost at vein 1A ( Fig. 12C ).

Metasoma finely punctate. First metasomal tergite 1.4 times as long as apically broad, not projecting dorsally ( Fig. 12C ), its dorsal longitudinal carinae reaching middle of tergite and with an impression between carinae in basal part.Area between dorsal carina and spiracle with weak longitudinal impression. Spiracles not projecting laterally. Subapical impression strong and rather broad. First metasomal sternite 0.2 times as long as its tergite. Second metasomal tergite as long as apically broad. Second and third

tergites with weak transverse impressions. Ovipositor sheaths weakly cone-shaped and as long as 0.5 of height of last visible tergite. Ovipositor stout at base with a shallow subapical notch.

Colouration: body mostly black ( Fig. 12 ); face (excluding middle and area around clypeal fovea), clypeus, mandibles and trochanters yellow ( Fig. 12A ); antennal flagellomeres, legs (except coxae, trochanters, and apical part of hind tibia and hind tarsus), and metasomal tergites 2–4 reddish.

Male

Morphologically similar to female, but with ramulus absent. Parameres not elongate apically and not extending beyond aedeagus.

Colouration as in female, but with face, sternites, epipleurum of tergites and parameres yellow.

Host records

Allantus cinctus (Linné, 1758) , Cladius pectinicornis (Geoffroy, 1785) *.

Distribution

Austria *, Belarus, Finland, France, Germany, the Netherlands, Norway, Poland, Romania, Sweden *, U.K.

Comments

These are the first tentative records for Austria and Sweden. As the type specimen of this species is lost and males from Finland and Sweden are rather different in structure of face from the female known from Austria, more work is needed to ascertain their taxonomic status.

Figures

Fig. 12. Rhinotorus similis (Brischke, 1892), Ƌ. A. Face. B. Propodeum. C. Habitus.

Fig. 10. Rhinotorus nasutus (Gravenhorst, 1829). A. Face. B. Head dorsally. C. Propodeum. D. First metasomal tergite dorsally. E. Habitus.