Blacus (Ganychorus) xueshanensis, Lu & Chai & Achterberg & Tang & Chen, 2025

Lu, Qian-Yu, Chai, Hong-Fei, Achterberg, Cornelis Van, Tang, Pu & Chen, Xue-Xin, 2025, The first review of the subgenus Ganychorus Haliday, 1835 (Hymenoptera, Braconidae, Brachistinae) in China, Zootaxa 5575 (2), pp. 201-250 : 247-249

Blacus (Ganychorus) xueshanensis sp. nov.

( Figs 41–42 )

Material examined. Holotype: ♀, China, Taiwan, Xue Mtn , 3.VIII.2010, No. 201301094 ( ZJUH) . Paratypes: 1♀, China, Liaoning, Laotudingzi , 16–19.VII.2011, No. 202024723 ; 2♀♀, China, Taiwan, Xue Mtn , 10.VI.2011, No. 201300646; 7.X.2011, No. 201302107 ( ZJUH) .

Diagnosis. The new species is similar to B. (G.) setosifrons van Achterberg, 1988 because it has frons densely setose, length of eye in dorsal view 1.2 × temple, first discal cell of fore wing narrowly truncate anteriorly, notauli only crenulate anteriorly, precoxal sulcus wide and striate-rugose, propodeal tubercles absent, and propodeum without areola, but differs by having propodeum smooth between carinae (rugose in B. (G.) setosifrons ), length of third antennomere 1.8 × its fourth antennomere (1.3 ×), length of vein 2-CU1 of fore wing about equal to vein 1- CU1 (over 2.0 ×), length of first tergite 2.1–2.2 × its apical width (1.4–1.8 ×), middle claws simple (with blackish bristles), lateral carina of scutellum more protruding posteriorly (not protruding posteriorly), and body yellowish brown (dark reddish brown).

Description. Female. Length of body 2.4 mm, length of fore wing 2.8 mm.

Head. Antennomeres 18 ( Fig. 42C ); length of first flagellomere 1.8 × length of second flagellomere; length of first, second and penultimate flagellomere 5.0, 2.75 and 1.75 × their width, respectively; length of maxillary palp approx. 1.1 × height of head; occipital carina complete; head densely setose in dorsal view; frons smooth and suture present; OOL: OD: POL = 11: 4: 4; length of eye in dorsal view 1.1 × length of temple; face with very weak transverse rugae; malar suture present, length of malar space 2.0 × basal width of mandible.

Mesosoma. Length of mesosoma 1.4 × its height; side of pronotum smooth dorsally, rugose ventrally; precoxal sulcus wide and striate-rugose; notauli narrow, spaced crenulate anteriorly and almost smooth posteriorly ( Fig. 42E ); middle mesoscutal lobe and area near notauli setose; scutellum largely smooth, slightly rugose near lateral carinae, protruding dorsally; propodeal tubercles absent; surface of propodeum largely smooth between carinae and medial area absent ( Fig. 42G ).

Wings. Fore wing: first discal cell narrowly truncate anteriorly; 1-CU1: 2-CU1 = 11: 12 ( Fig. 42H ).

Legs. Hind coxa with several rugae dorsally; length of femur, tibia and basitarsus of hind leg 6.2, 13.2 and 9.3 × their width, respectively; fore claws with blackish bristles, middle and hind claws simple ( Fig. 42J ).

Metasoma. Length of first tergite 2.1 × its apical width, widened apically, finely rugose ( Fig. 42G ); second tergite smooth ( Fig. 42G ); length of ovipositor sheath 0.22 × length of fore wing.

Colour. Body yellowish brown; antenna largely yellow, 2 apical antennomeres brown; head, mesonotum, all legs, tegulae, parastigma, pterostigma and veins dark yellow; palpi pale yellow; wing membrane hyaline.

Variation. Length of first tergite 1.8–2.1 × its apical width.

Male. Unknown.

Biology. Unknown.

Distribution. China (Liaoning, Taiwan).

Etymology. The specific name xueshanensis refers to the collection site of the holotype in Taiwan.

Figures

FIGURE 41. Ganychorus xueshanensis sp. nov. (body, lateral aspect).

FIGURE 42. Ganychorus xueshanensis sp. nov. A. head, dorsal aspect; B. head, anterior aspect; C. antenna; D. mesosoma, lateral aspect; E. mesosoma, dorsal aspect; F. hind leg; G. propodeum and metasoma, dorsal aspect; H. wings; I. ovipositor and ovipositor sheath; J. middle claw.