Gasteruption angulatum, Zhao, Ke-xin, Achterberg, Cornelis van & Xu, Zai-fu, 2012

Zhao, Ke-xin, Achterberg, Cornelis van & Xu, Zai-fu, 2012, A revision of the Chinese Gasteruptiidae (Hymenoptera, Evanioidea), ZooKeys 237, pp. 1-123 : 15-19

Gasteruption angulatum sp. n. Figs 1023

Type material.

Holotype, ♀ (ZJUH), "[China:] Zhejiang, West Mt. Tianmu, Laodian–Xianrending, 1250-1547 m, 17 –18.V.1988”. Paratypes: 1 ♀ (ZJUH), "[Chi na:] Henan, Luoshan, Mt. Ling, 22.V.2000, Ping Cai"; 1 ♂ (SCAU), "[China:] Shaanxi, Ningshaan, Xunyangba, 1371m, 6.V.2011, Hua-yan Chen"; 2 ♀ (SCAU), "[China:] Hubei, Shennongjia, 15-19.V.2012, Kai Shi"; 2 ♀ + 1 ♂ (ZJUH), "[China:] Zhejiang, West Mt. Tianmu, VII.1981 & 2-4.VI.1990 & 16 –18.V.1988”; 1 ♀ (RMNH), "[China:] Zhejiang, West Mt. Tianmu, Laodian–Xianrending, 1250-1547, 7.VI.1989, Jun-hua He"; 1 ♂ (ZJUH), "[China:] Zhejiang, West Mt. Tianmu, Xianrending, 30.VII.1998, Ming-shui Zhao"; 1 ♂ (SCAU), "[China:] Zhejiang, West Mt. Tianmu, Chantan temple, 350 m, 16.V.1988, Jin-jiang Fan".

Diagnosis.

Head evenly convex in front of occipital carina and without any depression medio-posteriorly; occipital carina narrow and non-lamelliform medio-dorsally (Fig. 10); length of mesosoma about twice its height; propleuron 0.7-0.8 times as long as mesoscutum in front of tegulae (Fig. 11); mesoscutum coriaceous and matt, medio-posteriorly slightly rugulose (Figs 12, 20); hind coxa extremely slender and coriaceous; ovipositor widened apically and more or less angularly upcurved apically in dead specimens (Fig. 18); ovipositor sheath about 0.3-0.5 times as long as body and 0.4-0.6 times as long as metasoma; pale apical part of ovipositor sheath 1.9-2.3 times as long as hind basitarsus.

Description.

Holotype, female, body length 14.5 mm.

Head. Head directly narrowed behind eyes and distinct curved laterally (Fig. 15), emarginated distinctly medio-posteriorly; temple 0.5-0.6 times as long as eye in dorsal view (Fig. 15); vertex and frons matt and coriaceous; vertex moderately convex posterior ly (Fig. 10) and without any depression medio-posteriorly (Fig. 15); occipital carina narrow and non-lamelliform medio-dorsally (Fig. 10); third antennal segment 1.5 times as long as second segment; fourth antennal segment 1.3 times as long as third segment; fifth antennal segment 1.2 times as long as third segment (Fig. 17); eye glabrous; OOL 1.8 times as long as diameter of posterior ocellus; minimum width of malar space 0.2 times as long as second antennal segment; clypeus without depression (Fig. 14; cf. ♂ Fig. 22).

Mesosoma. Length of mesosoma twice its height; propleuron robust (Fig. 11), 0.7-0.8 times as long as mesoscutum in front of tegulae; side of pronotum mainly coriaceous, but dorsally a few rugulose, with a distinct antero-lateral tooth; mesoscutum coriaceous and matt (Fig. 12); medio-posteriorly slightly rugulose; scutellum coriaceous and matt; mesopleuron coriaceous; propodeum reticulate-rugose, medio-longitudinal carina distinct.

Wings. Fore wing: first discal cell parallel-sided and with outer posterior corner rounded (Fig. 16).

Legs. Hind coxa matt, extremely slender and coriaceous (Fig. 13); length of hind femur, tibia and basitarsus 4.9, 5.5 and 5.5 times their width, respectively; middle tarsus 1.2 times as long as middle tibia.

Metasoma. Apical of ovipositor width and more or less angularly upcurved (Fig. 18); ovipositor sheath 0.5 times as long as body, 0.6 times as long as metasoma, twice as long as hind tibia and 1.2 times combined hind tarsus and tibia; its ivory part 2.1 times as long as hind basitarsus and 0.3 times as long as ovipositor sheath; hypopygium shallow v-shaped apically.

Colour. Black-brown; mandible dark brown; antenna dark brown, gradually shallow; legs dark brown, fore and middle tarsi brown; metasoma dark brown.

Male (described after a male from China: Zhejiang). Body length 11.5 mm; head strongly curved laterally; temple 0.6 times as long as eye in dorsal view (Fig. 19); third antennal segment 1.5 times as long as second segment, fourth 1.4 times as long as third segment, fifth antennal segment as long as fourth segment and 1.4 times as long as third segment (Fig. 21); OOL 1.6 times as long as diameter of posterior ocellus; minimum width of malar space 0.4 times as long as second antennal segment; length of mesosoma 1.9 times as long as its height; propleuron 0.8 times as long as mesoscutum in front of tegulae; length of hind femur, tibia and basitarsus 5.6, 5.5 and 5.1 times their width, respectively (Fig. 23).

Variation. Female: body length 11.5-13.0 mm, ovipositor sheath 0.3-0.5 times as long as body, 0.4-0.6 times as long as metasoma, 1.6-2.0 times as long as hind tibia and 1.1-1.2 times combined hind tarsus and tibia; its ivory part 1.9-2.3 times as long as hind basitarsus and 0.3 times as long as ovipositor sheath; third antennal segment 1.5-1.6 times as long as second segment; fourth antennal segment 1.2-1.3 times as long as third segment; fifth antennal segment 1.1-1.2 times as long as third segment. Male: very similar to female in structure and color, but differs in size; body length 11.3-12.0 mm.

Distribution.

China (Shaanxi, Henan, Hubei, Zhejiang).

Biology.

Unknown. Collected in May to July.

Etymology.

Named after the more or less angulate apex of ovipositor in dead specimens; “angulus” is corner or bend in Latin.