Gasteruption granulatum Tan & van Achterberg, 2021

Tan, Jiang-Li, Achterberg, Cornelis van, Wu, Jia-Xuan, Wang, Hang & Zhang, Qi-Jing, 2021, An illustrated key to the species of Gasteruption Latreille (Hymenoptera, Gasteruptiidae) from Palaearctic China, with description of four new species, ZooKeys 1038, pp. 1-103 : 1

Gasteruption granulatum Tan & van Achterberg sp. nov. Figs 107-108 , 109-117 , 118-123

Gasteruption parvicollarium ; Zhao et al. 2012: 68-72 (p.p.: only ♀, not ♂).

Type material.

Holotype, ♀ (NWUX), "NW China: Shaanxi, Luonan, Luoyuan, 16.iv.-28.v.2016, black [Malaise] trap, 1310 m alt., 34.21°N, 108.89°E, JL Tan & QQ Tan, NWUX". Paratypes: 1 ♀ (RMNH), topotypic, but xii.2017-17.vi.2018; 1 ♂ (NWUX), "NW China: Shaanxi, Baolongyu, Qin[ling] Mt[s], ca. 1000 m alt., 24.v.2015, 34°3'N, 108°9'E, Jiangli Tan, NWUX".

Diagnosis.

Head of ♀ trapezoid in dorsal view, medio-posteriorly truncate or nearly so, in anterior view hardly protruding below lower level of eyes and mandibular condylus near lower level of eyes; occipital carina narrow and non-lamelliform medio-dorsally; vertex, at most, moderately bulging above upper level of eyes; clypeus with obsolescent depression; propleuron antero-dorsally granulate, rather robust in ventral and lateral; side of pronotum slender and with narrow and weakly crenulated grooves; mesoscutum matt and densely finely granulate; hind tibia slender and basitarsus elongate; hind tibia dark brown to yellowish-brown ventro-basally; apex of ovipositor narrow and with minute dorsal teeth; ovipositor sheath 1.2-1.8 × as long as hind tibia and its apex mainly dark brown; apical sternite of ♂ and paramere entirely dark brown.

Easily confused with G. parvicollarium Enderlein, but G. granulatum has the vertex, at most, moderately bulging above upper level of eyes (strongly bulging in G. parvicollarium ), head normal in dorsal view (distinctly elongated); apex of ovipositor narrow and with minute dorsal teeth (wider and with coarse dorsal teeth); propleuron less elongate in ventral view (more elongate) and robust in lateral view (somewhat more slender).

Description.

Holotype, female, length of body 14.0 mm, of fore wing 6.9 mm.

Head. Vertex and frons with satin sheen, very finely granulate, moderately convex (Fig. 109 ) and without a depression medio-posteriorly; head gradually contracted behind eyes in dorsal view and temples curved (Fig. 115 ); temple 0.6 × as long as eye in dorsal view; fourth antennal segment 1.2 × as long as third segment and 0.7 × as long as second and third segments combined, fifth antennal segment 1.1 × as long as third segment, third antennal segment 1.7 × as long as second segment; occipital carina narrow and non-lamelliform medio-dorsally (Figs 109 and 115 ); OOL twice as long as diameter of posterior ocellus; face wide, 2.1 × as broad as high and combined height of eye and malar space 1.7 × minimum width of face (Fig. 114 ); malar space not protruding below lower level of eyes (Fig. 114 ), its minimum width 0.2 × basal width of mandible and area behind incision much wider than high (Fig. 109 ); clypeus only medio-ventrally shallowly depressed (Fig. 114 ); eye glabrous.

Mesosoma. Length of mesosoma 2.1 × its height; propleuron robust and 0.8 × as long as mesoscutum in front of tegula (Fig. 110 ); pronotal side matt, sparsely setose and entirely finely granulate, except for narrow crenulated grooves, without acute tooth antero-ventrally, only corner rather rectangularly protruding (Fig. 110 ); propleuron densely and finely granulate, in ventral view, robust and nearly triangular (Fig. 108 ); antesternal carina narrow and hardly lamelliform; mesopleuron matt and mainly finely granulate, except for wide and coarsely crenulate depression and reticulate-rugose precoxal sulcus; mesosternal sulcus widened posteriorly and deep, coarsely transversely rugose; mesoscutum (but medio-posteriorly coarsely reticulate-punctate) and scutellum matt and densely finely granulate (Fig. 112 ), flat in lateral view (Fig. 107 ); scutellum perfectly flat; propodeum coarsely reticulate and with median smooth stripe. Wings. First discal cell slightly narrowed distally and with outer posterior corner rounded, with vein 3-CU1 near its apical quarter (Fig. 116 ). Legs. Hind coxa moderately slender (Fig. 112 ) and entirely finely granulate, matt; length of hind femur, tibia and basitarsus 4.3, 5.3 and 4.0 × their width, respectively; hind tibia slender (Fig. 112 ); middle tarsus 1.3 × as long as compressed middle tibia; middle femur subparallel-sided, compressed and slightly narrower than fore femur.

Metasoma. Ovipositor sheath 5.3 mm, 0.4 × as long as body, 0.5 × as long as metasoma and 1.6 × as long as hind tibia; ovipositor sheath with dense cover of fine brownish and adpressed setae, its apical half slender; ovipositor apex narrow and its dorsal teeth minute; hypopygium shallowly V-shaped emarginate medio-posteriorly (Fig. 117 ).

Colour. Black; apical fifth of antenna largely brown; tegulum and mandible brownish-yellow (except narrow dark borders); clypeus latero-ventrally and humeral plate dark brown; third-sixth metasomal tergites very narrowly apically pale greyish, fourth-sixth sternites apically pale greyish; fore and middle legs (except coxae) largely, hind trochantellus, hind femur apico-ventrally, hind tibial spurs, hind basitarsus apically and more or less second-fourth hind tarsal segments, yellowish-brown; remainder of hind leg (including basal half of tibia and excluding coxa), veins and pterostigma dark brown; wing membrane slightly infuscate, except basally; apex of ovipositor sheath mainly dark brown (Fig. 113 ).

Male. Similar to female (including fine granulate sculpture of mesoscutum and scutellum, Fig. 119 ) and fore wing (except its basal quarter) distinctly brownish; length of fore wing 5.5 mm, of body 12.2 mm; third antennal segment 1.4 × as long as second segment; fourth antennal segment 1.3 × as long as third segment and 0.8 × as long as second and third segments combined, fifth antennal segment 1.1 × as long as third segment (Fig. 122 ); hind tibia slightly more yellowish ventro-basally (Fig. 120 ); apical sternite and paramere entirely dark brown (Fig. 123 ).

Variations.

According to Zhao et al. (2012), ovipositor sheath sometimes 1.2 × as long as hind tibia. The topotypic paratype has the ovipositor sheath 1.8 × as long as hind tibia, length of body 12.2 mm and of ovipositor sheath 4.7 mm.

Distribution.

China (Shaanxi). According Zhao et al. (2012), Fujian, Guizhou, Hebei, Hubei, Hunan, Jiangsu, Shanxi, Taiwan and Zhejiang.

Etymology.

The name is derived from granulum (Latin for small grain or seed) because of the granulate mesoscutum and scutellum.

Figures

Figures 107 - 108. Gasteruption granulatum Tan & van Achterberg, sp. nov., female, holotype 107 habitus lateral 108 propleuron ventral.

Figures 109 - 117. Gasteruption granulatum Tan & van Achterberg, sp. nov., female, holotype 109 head lateral 110 mesosoma lateral 111 mesosoma dorsal 112 hind leg 113 apex of ovipositor sheath 114 head anterior 115 head dorsal 116 wings 117 apex of metasoma ventral.

Figures 118 - 123. Gasteruption granulatum Tan & van Achterberg, sp. nov., male, paratype 118 habitus lateral 119 mesosoma dorsal 120 hind leg 121 head dorsal 122 basal antennal segments 123 apex of metasoma lateral.