Blacus (Ganychorus) longitergitus, 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 : 226-228

Blacus (Ganychorus) longitergitus sp. nov.

( Figs 21–22 )

Material examined. Holotype: ♀, China, Yunnan, Bao Mtn, Lujiangba, Gaoligong Mtn Nature Park , 10.V.2009, Wang Manman, No. 200904532 ( ZJUH) . Paratypes: 1♀, China, Shaanxi, Qinling, Tiantai Mtn , 3.IX.1999, He Junhua, No. 990128 ; 1♀, Zhejiang, Gutian Mtn , 16.VII.1992, Chen Xuexin, No. 923216 ; 1♀, Fujian, Wuyi Mtn, Dazhulan , 15.VII.1994, Chen Xuexin, No. 942006 ; 1♀, Sichuan, Anzi River Reserve , 16.VIII.2016, Xiong Yanhong, No. 202021754 ; 1♀, Yunnan, Tengchong , Houqiao, 1.VI.2009, Malaise Trap, Tan Jiangli, No. 202026058 ( ZJUH) .

Diagnosis. The new species is similar to B. (G.) setosifrons van Achterberg, 1988 because it has rather densely setose frons, notauli only crenulate anteriorly, first discal cell truncate anteriorly, precoxal sulcus complete and widely rugose, propodeal tubercles absent, and propodeum without areola, but differs by having rugose propodeum (largely smooth between carinae in B. (G.) setosifrons ), length of first tergite 2.5–2.8 × its apical width (1.4–1.8 ×), second tergite base of second tergite with short oblique sculpture laterally (smooth), length of hind basitarsus 13.0 × its width (10.3 ×), length of malar space 1.3 × basal width of mandible (1.7 ×), and middle claws simple (with blackish bristles and teeth).

Description. Female. Length of body 2.8 mm, length of fore wing 3.1 mm.

Head. Antennomeres 20 ( Fig. 22C ); length of first flagellomere 1.5 × length of second flagellomere; length of first, second and penultimate flagellomere 5.25, 3.5 and 2.25 × their width, respectively; length of maxillary palp 1.4 × height of head; occipital carina complete; frons smooth and densely setose, frontal suture present; OOL: OD: POL = 10: 4: 5; length of eye in dorsal view 1.25 × length of temple; face with weak transverse rugae; malar suture present, length of malar space 1.4 × basal width of mandible.

Mesosoma. Length of mesosoma 1.4 × its height; side of pronotum smooth dorsally, rugose ventrally; whole mesopleuron with long sculpture ( Fig. 22D ); precoxal sulcus rather wide; notauli wide, crenulate anteriorly and rugose posteriorly ( Fig. 22E ); mesoscutal middle lobe and area near notauli setose; scutellum smooth, not protruding dorsally; propodeal tubercles absent; surface of propodeum rugose, medial area absent ( Fig. 22G ).

Wings. Fore wing: first discal cell widely truncate anteriorly; 1-CU1: 2-CU1 = 9: 23 ( Fig. 22I ).

Legs. Hind coxa weakly rugose-dorsally; length of femur, tibia and basitarsus of hind leg 7.0, 11.9 and 13.0 × their width, respectively; fore and middle claws with blackish bristles ( Fig. 22H ), hind claws simple.

Metasoma. Length of first tergite 2.5 × its apical width, slender and reticulate-rugose, widened apically ( Fig. 22G ); base of second tergite with short oblique sculpture laterally ( Fig. 22G ); length of ovipositor sheath 0.22 × length of fore wing.

Colour. Dark brown; antenna largely yellow, several apical antennomeres and scape yellowish brown; clypeus, mandible and mesonotum yellow; palpi, pterostigma, parastigma, veins, basal half of metasoma ventrally and all legs (but telotarsi brown) pale yellow; wing membrane subhyaline.

Variation. Mesonotum more or less yellow; head in dorsal view yellowish brown or brown; length of first tergite 2.5–2.8 × its apical width; body yellowish brown or brown.

Male. Unknown.

Biology. Unknown.

Distribution. China (Shaanxi, Zhejiang, Fujian, Sichuan, Yunnan).

Etymology. The specific name longitergitus refers to the long first metasomal tergite and is derived from “ longus ” (Latin for long) and “ tergum ” (Latin for back).

Figures

FIGURE 21. Ganychorus longitergitus sp. nov. (body, lateral aspect).

FIGURE 22. Ganychorus longitergitus 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. middle claw; I. wings; J. ovipositor and ovipositor sheath.