Parastephanellus yixiwui Tan & van Achterberg

Tan, Jiang-Li, Achterberg, Cornelis Van, Tan, Qing-Qing, Zhou, Tong & Li, Tao, 2018, Parastephanellus Enderlein (Hymenoptera: Stephanidae) revisited, with description of two new species from China, Zootaxa 4459 (2), pp. 327-349: 342-345

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Parastephanellus yixiwui Tan & van Achterberg

sp. n.

Parastephanellus yixiwui Tan & van Achterberg  , sp. n.

Figs 70–91View FIGURES 70, 71View FIGURES 72–81View FIGURE 82–84View FIGURES 85–91

Parastephanellus matsumotoi  ; Hong et al. 2011: 43 –44 (p.p.).

Type material. Holotype, ♀ ( NWUX), “NW China: Shaanxi, Meixian, Taibai Mt., Haopingsi to Dadian , swept, N34.4° E107.46°, 16.vii.2017, altGoogleMaps  . 1251 m, T. Zhou & Y-X. Wu, NWUX”. Paratypes (2 ♀+ 11 ♂): 4 ♂ ( NWUX) same data as holotypeGoogleMaps  ; 1 ♀ + 7 ♂ ( NWUX, RMNH), same data, but Jiangli Tan GoogleMaps  ; 1 ♀ ( NWUX) “NW China: Shaanxi, Ningshaan, Xunyangba , N33°54’ E108°55’, Malaise trap, 17.viii-3.x.2016, altGoogleMaps  . 1481 m, Jiangli Tan, NWUX”; 1 ♀ ( ZJUH), “[ China:] Henan, Songxian, Mt. Baiyun , 19.vii.1996., Cai Ping, No. 972997”. 

Diagnosis. Ivory streak of temple distinctly contrasting with dark brown posterior part of temple in lateral view ( Fig. 80View FIGURES 72–81), separated from occipital carina in dorsal view ( Figs 79View FIGURES 72–81, 89View FIGURES 85–91); temples moderately angulate to rather rounded in dorsal view ( Figs 79View FIGURES 72–81, 89View FIGURES 85–91); frons of ♀ largely dark brown; medio-anteriorly pronotum gradually arising behind neck ( Figs 70View FIGURES 70, 71, 73View FIGURES 72–81); pronotum below tegulae costate ( Fig. 73View FIGURES 72–81); posterior part of pronotum and mesoscutum low in lateral view ( Fig. 70View FIGURES 70, 71); vein 1-M of fore wing approx. 1.4 × vein m-cu and 1.3–1.5 × vein 1-SR ( Fig. 72View FIGURES 72–81); vein 1-SR of fore wing strongly angled with vein 1-M and as long as vein 2-M+CU1 ( Fig. 72View FIGURES 72–81); vein m-cu of fore wing approx. 1.5 × longer than vein 2-SR+M; sclerotized part of vein 2-M of fore wing surpassing level of apex of vein r; first metasomal tergite of ♀ moderately slender, 6.2–7.2 × as long as wide ( Fig. 75View FIGURES 72–81); pygidial area of ♀ moderately emarginated apically, distinctly protruding and truncate latero-apically ( Fig. 71View FIGURES 70, 71); ovipositor sheath 1.4– 1.7 × as long as body and 2.5–2.8 × as long as fore wing.

Thanks to the large series from Taibai Mt. it became obvious that the specimens with gradually lowered anterior slope of the pronotum are a separate species because the different pronotum is combined with different venation of the fore wing and different shape of the pygidial area (see couplet 1 of the key). Runs in the key to Parastephanellus  by Elliott (1928) either to P. rubripictus Elliott, 1917  , or to P. polychromus Kieffer, 1916  . The new species differs from P. rubripictus  by having the ovipositor sheath 1.4–1.7 × as long as body (about as long as body in P. rubripictus  ), moderately wide and medium-sized pterostigma (long and narrow) and the coriaceousfoveolate propodeum (coarsely reticulate-rugose). It differs from P. polychromus  by having the ovipositor sheath 1.4–1.7 × as long as body (about as long as body in P. polychromus  ), the pterostigma approx. 6 × as long as wide (8–10 x) and the frons of ♀ black (of ♀ red). The long ovipositor sheath, low posterior part of pronotum and moderately long first metasomal tergite are shared by P. mufeedae Narendran & Surashan, 2001  ( Narendran & Surashan 2001) from S. India. The new species differs by having the ivory streak of the temple remaining far removed from the occipital carina in dorsal view (ivory streak ends close to occipital carina, behind middle level of carina in P. mufeedae  ), the frons wide, minimum width of frons approx. 2.3 × maximum width of eye in anterior view (approx. 1.7 x), and vertex behind posterior level of eyes distinctly transversely rugose (smooth).

Description. Holotype, ♀, length of body 11.8 mm, of fore wing 7.8 mm, and of ovipositor sheath 19.7 mm ( Fig. 83View FIGURE 82–84).

Head. Antenna with 35 segments, third segment without circular sensillum ventrally, fourth segment with 6 circular sensilla; frons coarsely transversely rugose ( Fig. 78View FIGURES 72–81); three anterior coronal teeth large and lobe-shaped ( Fig. 79View FIGURES 72–81), both posterior ones narrow lamelliform and arcuate; vertex largely coarsely transversely rugose anteriorly, near occipital carina only medially transversely aciculate; temple convex, smooth (except some setiferous punctures) and shiny ( Fig. 80View FIGURES 72–81), rounded in dorsal view ( Fig. 79View FIGURES 72–81).

Mesosoma. Neck short and transversely carinate, anteriorly distinctly emarginated ( Fig. 75View FIGURES 72–81), posteriorly with transverse groove in front of low and oblique posterior part of pronotum ( Fig. 73View FIGURES 72–81), posterior part very finely rugulose medio-anteriorly, costate below tegula ( Figs 73, 74View FIGURES 72–81); propleuron largely smooth and shiny except laterally; mesopleuron coriaceous and shiny (except anteriorly), medially superficially foveolate ( Fig. 73View FIGURES 72–81), anteriorly rather densely silvery setose; scutellum with fine curved aciculae medially and foveolate laterally ( Fig. 74View FIGURES 72–81); propodeum remotely foveolate and with wide coriaceous interspaces, posteriorly with two pairs of smooth and strongly shiny shallow depressions ( Figs 74, 75View FIGURES 72–81); metapleuron very coarsely foveolate-reticulate and convex medially.

Wings. Fore wing ( Fig. 72View FIGURES 72–81): pterostigma 5.8 × as long as wide and rather abruptly rounded apically; vein 1-M 1.4 × as long as vein 1-SR and as long as vein m-cu; vein cu-a distinctly antefurcal and subvertical; vein 2-SR 1.7 × as long as vein r; vein r ends  near level of apex of pterostigma; basal part of pterostigma 2.4 × as long as apical part ( Fig. 72View FIGURES 72–81); vein 1-M and vein r nearly  straight; vein 1-SR 1.2 × as long as parastigmal vein; vein 3-CU1 largely nebulous and widened posteriorly, only basal 0.2 tubular ( Fig. 72View FIGURES 72–81).

Legs. Hind coxa elongated, 3.1 × longer than wide, with large flattened cellular-granulate dorso-lateral area ( Fig. 76View FIGURES 72–81), remainder largely coarsely rugose; hind femur coriaceous, ventrally with 2 large teeth and one smaller basal tooth ( Fig. 77View FIGURES 72–81); hind tibia 1.2 × as long as hind femur, largely coriaceous and ventrally with oblique carinae, inner side with distinct c-shaped impression and yellowish setose, basal narrow part of hind tibia as long as widened part; ventral length of hind basitarsus 5.2 × as long as wide.

Metasoma. First tergite densely transversely striate, 6.2 × as long as its maximum width ( Fig. 75View FIGURES 72–81), 2.4 × second tergite and 0.85 × metasoma without first tergite; second tergite basally slightly rugulose; remainder of metasoma rather shiny and very superficially coriaceous; pygidial area triangularly depressed, apically moderately circularly emarginated and latero-apically truncate and moderately protruding ( Fig. 71View FIGURES 70, 71); ovipositor sheath 1.6 × as long as body Fig. 43View FIGURES 43-44) and 2.53 × as long as fore wing.

Colour. Black or blackish brown; temple with ivory streak along eye widened dorsally, well differentiated and remaining far from occipital carina ( Figs 70View FIGURES 70, 71, 79, 80View FIGURES 72–81); middle tibia basally and narrowly apically and basal half of middle basitarsus white; remainder of tarsi, basal half of hind tibia and four basal antennal segments brown; palpi pale yellowish but basally dark brown; face, temple posteriorly, tegula, frons ventrally, fore leg largely (except tarsus and coxa), middle femur, apical half of hind tibia largely, pterostigma (except whitish base) and veins dark brown; apex of hind coxa partly ivory ( Fig. 49View FIGURES 45–54); wing membrane slightly infuscated.

Variation. Female: length of body 11.4–17.2 mm, of fore wing 7.3–10.4 mm, and of ovipositor sheath 15.5– 28.0 mm; vein 1-M of fore wing 1.3–1.5 × vein 1-SR; first metasomal tergite of ♀ 6.2–7.2 × its maximum width; ovipositor sheath 1.4–1.7 × as long as body; wing membrane slightly to distinctly infuscated. Male ( Fig. 84View FIGURE 82–84): similar to female but frons and face yellowish, and temple posteriorly brown to dark brown ( Figs 85, 88View FIGURES 85–91); length of body 6.6–11.7 mm, and of fore wing 4.2–7.2 mm; length of first tergite 7.7–8.7 × its maximum width; parameres convex, long to medium-sized and densely setose ( Fig. 86View FIGURES 85–91); pygidial process medium-sized, yellowish brown (as remainder of tergite and base of parameres: Figs 82View FIGURE 82–84, 86View FIGURES 85–91).

Distribution. China (* Henan, * Shaanxi).

Etymology. Named after one of the collectors of the holotype, the 8-year-old nephew of the first author: Yi-Xi Wu, means a rare thing is expensive.


National Museum of Natural History, Naturalis














Parastephanellus yixiwui Tan & van Achterberg

Tan, Jiang-Li, Achterberg, Cornelis Van, Tan, Qing-Qing, Zhou, Tong & Li, Tao 2018

Parastephanellus matsumotoi

Hong et al. 2011 : 43