Parastephanellus evexus 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: 336-340

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Parastephanellus evexus Tan & van Achterberg

sp. n.

Parastephanellus evexus Tan & van Achterberg  , sp. n.

Figs 43–61View FIGURES 43-44View FIGURES 45–54View FIGURE 55View FIGURES 56–61

Parastephanellus brevistigma  ; Chen et al. 2016a: 119 –122 (♂).

Type material. Holotype, ♀ ( NWUX): “[SE China:] Jiangxi, Quannan, 650 m,, Sichang Li ”  . Paratypes: 1 ♂ ( NWUX): topotypic and same data  ; 1 ♂ ( SCAU): “[SE China:] Guangdong, Nanling National Nature Reserve, 6.x.2004, Zaifu Xu ” 

Diagnosis. Ivory streak of temple distinctly contrasting with dark brown posterior part of temple in lateral view ( Fig. 46 View Figure ), separated from occipital carina in dorsal view ( Figs 53 View Figure , 60 View Figure ); temples of ♀ strongly angulate in dorsal view ( Fig. 53 View Figure ); frons of ♀ dark brown; medio-anteriorly pronotum gradually arising behind neck ( Figs 43 View Figure , 47 View Figure ); pronotum below tegulae costate ( Fig. 47 View Figure ); posterior part of pronotum and mesoscutum moderately high in lateral view ( Fig. 43 View Figure ); vein 1-M of fore wing approx. 1.2 × vein m-cu and 1.8–1.9 × vein 1-SR ( Fig. 45 View Figure ); vein 1-SR of fore wing strongly angled with vein 1-M and as long as vein 2-M+CU1 ( Fig. 45 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 up to level of apex of vein r; first metasomal tergite of ♀ very slender and approx. 9.5 × as long as wide ( Fig. 44 View Figure ); pygidial area of ♀ moderately emarginated apically, not protruding and rounded latero-apically ( Fig. 54 View Figure ); ovipositor sheath approximately as long as body and 1.8 × as long as fore wing.

Runs in the key to Parastephanellus  by Elliott (1928) either to P. rubripictus Elliott, 1917  , or to P. crassicoxae Elliott, 1928  . The new species differs from P. rubripictus  by having the frons coarsely vermiculate-rugose (rugosepunctate in P. rubripictus  ), the moderately wide and medium-sized pterostigma (long and narrow), the first tergite 0.8 × as long as remainder of metasoma (of equal length), the neck with transverse carinae (with longitudinal carinae) and the coarsely foveolate propodeum (coarsely reticulate-rugose). It differs from P. crassicoxae  by having the hind coxa elongated (very stout in P. crassicoxae  ), the coarsely foveolate propodeum (reticulatepunctate) and the propleuron largely smooth (transversely aciculate).

Description. Holotype, ♀, length of body 13.5 mm, of fore wing 7.6 mm, and of ovipositor sheath 13.0 mm.

Head. Antenna incomplete, with 10 segments remaining, third segment with one circular sensillum ventrally, fourth segment with 4 circular sensilla; frons coarsely vermiculate-rugose ( Fig. 52 View Figure ); three anterior coronal teeth large and lobe-shaped ( Fig. 53 View Figure ), both posterior ones wider and arcuate; vertex largely coarsely rugose anteriorly, largely smooth posteriorly, only medially transversely aciculate; temple strongly convex, smooth and shiny ( Fig. 46 View Figure ), angulate in dorsal view ( Fig. 53 View Figure ).

Mesosoma. Neck short and transversely carinate, anteriorly distinctly emarginated ( Figs 46–48 View Figure ), posteriorly with transverse groove in front of oblique posterior part of pronotum ( Fig. 47 View Figure ), posterior part rugulose medioanteriorly, costate below tegula ( Figs 47, 48 View Figure ); propleuron largely smooth and shiny except laterally; mesopleuron rather shiny (except anteriorly), superficially coriaceous and medially foveolate ( Fig. 47 View Figure ), anteriorly densely yellowish setose; scutellum finely aciculate medially and with foveolae laterally ( Fig. 48 View Figure ); propodeum coarsely foveolate and with narrow coriaceous interspaces ( Figs 47, 48 View Figure ); metapleuron very coarsely foveolate, convex medially.

Wings. Fore wing ( Fig. 45 View Figure ): pterostigma 5.8 × as long as wide and rather abruptly rounded apically; vein 1-M 1.9 × as long as vein 1-SR and 1.2 × vein m-cu; vein 1-SR as long as vein 2-SR+M; vein cu-a distinctly antefurcal and reclivous; vein 2-SR 1.5 × as long as vein r; vein r ends  near level of apex of pterostigma; basal part of pterostigma twice as long as apical part ( Fig. 43 View Figure ); vein 1-M and vein r distinctly  curved; vein 1-SR as long as parastigmal vein; vein 3-CU1 largely nebulous and widened posteriorly, only basal 0.1 tubular ( Fig. 45 View Figure ).

Legs. Hind coxa elongated, 3.4 × longer than wide, with small flattened granulate dorso-lateral area ( Fig. 49 View Figure ), largely coarsely rugose; hind femur coriaceous, ventrally with 2 large teeth and one smaller basal tooth ( Fig. 50 View Figure ); hind tibia 1.2 × as long as hind femur, largely coriaceous and ventrally with oblique carinae, inner side with distinct v-shaped impression, basal narrow part of hind tibia as long as widened part; ventral length of hind basitarsus 4.7 × as long as wide.

Metasoma. First tergite densely transversely striate, 9.5 × as long as its maximum width ( Fig. 44 View Figure ), 2.5 × second tergite and 0.8 × metasoma without first tergite; second tergite basally with some rugae; remainder of metasoma rather shiny and very superficially cellular-coriaceous; pygidial area triangularly depressed, apically moderately circularly emarginated and latero-apically rounded, not protruding ( Fig. 54 View Figure ); ovipositor sheath nearly as long as body ( Fig. 43 View Figure ).

Colour. Black or blackish brown; temple with ivory streak along eye long, well differentiated and nearly up to occipital carina ( Figs 46, 53 View Figure ); middle tibia basally and narrowly apically and most of middle basitarsus white; remainder of tarsi and four basal antennal segments brown; palpi pale yellowish but basally dark brown; face, temple posteriorly, frons ventrally, pronotum ventrally, propleuron, fore leg largely (except tarsus), middle coxa and femur, metasoma apically and ventrally (except first tergite), hind tibia largely, pterostigma (except whitish base) and veins dark brown; apex of hind coxa partly ivory ( Fig. 49 View Figure ); wing membrane subhyaline.

Male. Length of body 7.6 mm, of fore wing 4.3 mm, antenna with 26 segments. Similar to female but frons brownish yellow ( Fig. 59 View Figure ), vertex mainly regularly transversely striate but rugose anteriorly, temples evenly rounded in dorsal view ( Fig. 60 View Figure ), foveolation of mesopleuron, metapleuron and propodeum reduced, flattened area of hind coxa larger and coxa 3.9 × longer than wide), first tergite 8.7 × longer than wide and base of second tergite orange brown. Parameres moderately convex and setose ( Fig. 58 View Figure ).

Distribution. China (* Guangdong, * Jiangxi).

Etymology. Named “ evexus  ” (Latin for “rounded at the top”), because of the rounded apex of the metasoma of the ♀.

Notes. The male of P. brevicoxalis sensu Chen et al. (2016)  is transferred to this species, because of the slender first tergite (nearly 11 × as long as wide, Fig. 20 View Figure ; not the description!), the reduced dentition basally of the median tooth of the hind femur, the venation of the fore wing, and the dorsally narrow ivory streak of temple. The gradually sloping pronotum and normal hind coxa (about 3 × as long as wide) fit in with this transfer. Only the colour of the posterior part of the temple differs: rather dark brown in the paratype from Jiangxi and brown in the paratype from Guangdong.














Parastephanellus evexus Tan & van Achterberg

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


Parastephanellus brevistigma

Chen et al. 2016a : 119