Hybrizon hei van Achterberg & Liu, 2019

Liu, Jing-Xian, van Achterberg, Cornelis, Zheng, Bo-Ying & Yang, Qi-Meng, 2019, Hybrizon Fallen (Hymenoptera, Ichneumonidae, Hybrizontinae) in China, Journal of Hymenoptera Research 72, pp. 11-26 : 11

Hybrizon hei van Achterberg & Liu sp. nov.

http://zoobank.org/AF9727B5-5B3F-471F-9026-539BBFC0B781 Figs 16-22

Type material.

Holotype, ♀ (ZJUH), "NE China: Shandong, Shanghe County, Ji’nan, Xushang, Dong Balizhuang, 36°16'4"N, 117°9'10"E, Malaise trap, 24-30.ix.2018, Jia-He Yan & Qi-Meng Yang", “20190119” (the molecular sequences originate from this specimen). Paratypes (ZJUH, RMNH): 10 ♀, same data as holotype.

Differentiating diagnosis.

The West Palaearctic H. pilialatus Tobias, 1988, is very similar to the new species, but H. pilialatus has vein r of fore wing distinctly removed from base of pterostigma and less oblique ( Fig. 15 in van Achterberg 1999; vein r issued virtually at base of pterostigma and distinctly oblique in H. hei ), disco-submarginal cell of fore wing 1.1 times higher than subdiscal cell (1.5-1.9 times in H. hei ) and vein 1-R1 (= metacarp) of fore wing about 0.4 times length of pterostigma (about 0.6 times in H. hei ). According to the molecular analyses it is distinctly separated from H. xui and H. buccatus ( Figs 30 , 31 ); unfortunately, molecular data of its most closely relative ( H. pilialatus ) are yet unknown.

Molecular data.

MN168094 (28S) and MN125615 (CO1).

Description.

Holotype, ♀, length of body 3.6 mm, of fore wing 2.6 mm.

Head. Antenna with 13 segments and 0.9 times as long as fore wing, length of third segment 1.3 times fourth segment, length of third, fourth and penultimate segments 6.5, 5.0 and 3.0 times their width, respectively; pedicellus slightly longer and wider than scapus; apical segment of maxillary palp rather elongate (compared to width of penultimate segment; Fig. 19 ); face rugulose-granulate medio-dorsally and remainder largely smooth ( Fig. 20 ); maximum width of face 1.4 times its minimum width ( Fig. 20 ); frons granulate and rather shiny, near antennal sockets depressed and rugulose; length of eye 3.8 times temple in dorsal view; temples directly narrowed behind eyes; vertex shiny and very superficially granulate; OOL:diameter of ocellus:POL = 3:3:6; length of malar space 2.5 times basal width of mandible, concave, anteriorly smooth and posteriorly granulate.

Mesosoma. Length of mesosoma 1.1 times its height; mesoscutum strongly shiny, smooth (except for some superficial punctulation) and without notauli ( Fig. 21 ); scutellum convex and moderately shiny, superficially granulate ( Fig. 21 ); ventral half of mesopleuron rather matt and granulate; mesosternal sulcus narrow and smooth; metapleuron shiny and granulate; metanotum slightly and obtusely protruding dorsally; propodeum granulate, but medially and posteriorly areolate with interspaces largely smooth.

Wings. Fore wing: marginal cell comparatively slender ( Fig. 17 ); basal cell of fore wing largely and evenly setose ( Fig. 17 ); vein r issued at base of pterostigma and distinctly oblique ( Fig. 17 ); vein 1-M moderately curved and medium-sized, with disco-submarginal cell 1.5 times higher than subdiscal cell.

Legs. Hind coxa granulate; in lateral view length of femur, tibia and basitarsus of hind leg 8.3, 7.6 and 5.6 times their width, respectively; spurs of hind tibia 0.3 and 0.4 times hind basitarsus.

Metasoma. Length of first tergite 3.1 times its apical width, shiny, smooth except some aciculae, laterally rugose ( Fig. 19 ), subapically parallel-sided and its spiracles slightly protruding; basal half of second tergite with some weak striae; remainder of metasoma smooth and shiny; hypopygium with bristly setae; second tergite with sharp lateral crease; length of setose part of ovipositor sheath 0.08 times fore wing and 0.26 times second metasomal tergite ( Fig. 22 ); ovipositor needle-shaped.

Colour. Dark brown or brownish black; mouthparts (including mandible) and clypeus largely white; scapus, pedicellus ventrally, tegulae, legs and anterior half of fourth tergite yellowish brown; scutellum (except medially), pronotum, mesosternum, mesopleuron (except dorsally) and metasoma (except first tergite) mainly brown; remainder of antenna largely dark brown; veins and pterostigma largely brown; vein 1-M of fore wing paler than vein 2-CU1 of fore wing; wing membrane subhyaline.

Variation. Length of body (2.3-)3.4-4.1 mm, of fore wing (2.1-)2.6-2.9 mm; maximum width of face 1.3-1.4 times its minimum width; in lateral view length of hind basitarsus 5.4-5.8(-6.3) times its maximum width; disco-submarginal cell of fore wing 1.4-1.7(-1.9) times higher than subdiscal cell; scutellum sometimes rather flat and not reaching level of mesoscutum, but in most specimens convex and protruding above level of mesoscutum, dark brown to largely pale yellowish; face dark brown or partly pale brown, frequently with ivory stripe medially; mesoscutum dark brown or brown antero-laterally.

Distribution.

China (Shandong).

Etymology.

Named after Prof. Dr Jun-Hua He (Zhejiang University, Hangzhou) on the occasion of his 90th birthday for his numerous contributions to the systematics of Chinese Hymenoptera for more than 45 years.

Figures

Figures 16 - 22. Hybrizon hei sp. nov., ♀, paratype 16 habitus, lateral aspect 17 wings 18 hind tarsus, lateral aspect 19 head and mesosoma, lateral aspect 20 head, anterior aspect 21 head and mesosoma, dorsal aspect 22 ovipositor and ovipositor sheath, lateral aspect.

Figures 9 - 15. Hybrizon buccatus (de Brebisson), ♀, China, Shandong 9 habitus, lateral aspect 10 wings 11 hind tarsus, lateral aspect 12 head and mesosoma, lateral aspect 13 head, anterior aspect 14 head and mesosoma, dorsal aspect 15 ovipositor and ovipositor sheath, lateral aspect.

Figures 30, 31. RAxML result analysis of 28 S and COI sequences. Numbers in parentheses are GenBank numbers.