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, RMNHAbout 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. 80 View Figure ), separated from occipital carina in dorsal view ( Figs 79 View Figure , 89 View Figure ); temples moderately angulate to rather rounded in dorsal view ( Figs 79 View Figure , 89 View Figure ); frons of ♀ largely dark brown; medio-anteriorly pronotum gradually arising behind neck ( Figs 70 View Figure , 73 View Figure ); pronotum below tegulae costate ( Fig. 73 View Figure ); posterior part of pronotum and mesoscutum low in lateral view ( Fig. 70 View Figure ); vein 1-M of fore wing approx. 1.4 × vein m-cu and 1.3–1.5 × vein 1-SR ( Fig. 72 View Figure ); vein 1-SR of fore wing strongly angled with vein 1-M and as long as vein 2-M+CU1 ( Fig. 72 View Figure ); 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. 75 View Figure ); pygidial area of ♀ moderately emarginated apically, distinctly protruding and truncate latero-apically ( Fig. 71 View Figure ); 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. 83 View Figure ).

Head. Antenna with 35 segments, third segment without circular sensillum ventrally, fourth segment with 6 circular sensilla; frons coarsely transversely rugose ( Fig. 78 View Figure ); three anterior coronal teeth large and lobe-shaped ( Fig. 79 View Figure ), 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. 80 View Figure ), rounded in dorsal view ( Fig. 79 View Figure ).

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

Wings. Fore wing ( Fig. 72 View Figure ): 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. 72 View Figure ); 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. 72 View Figure ).

Legs. Hind coxa elongated, 3.1 × longer than wide, with large flattened cellular-granulate dorso-lateral area ( Fig. 76 View Figure ), remainder largely coarsely rugose; hind femur coriaceous, ventrally with 2 large teeth and one smaller basal tooth ( Fig. 77 View Figure ); 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. 75 View Figure ), 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. 71 View Figure ); ovipositor sheath 1.6 × as long as body Fig. 43 View Figure ) 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 70 View Figure , 79, 80 View Figure ); 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. 49 View Figure ); 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. 84 View Figure ): similar to female but frons and face yellowish, and temple posteriorly brown to dark brown ( Figs 85, 88 View Figure ); 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. 86 View Figure ); pygidial process medium-sized, yellowish brown (as remainder of tergite and base of parameres: Figs 82 View Figure , 86 View Figure ).

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