taxonID	type	description	language	source
955D853F8904AE1DFF43B71FFE70FF72.taxon	materials_examined	Material examined. Holotype ♀, CHINA, Yunnan, Longchuan, 26 − 28. IV. 2013, Coll. G. H. Zu, H. L. Han, X. X. Jin and C. Zhang.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8904AE1DFF43B71FFE70FF72.taxon	diagnosis	Diagnosis. Body length 1.2 – 1.4 mm. Body generally dark brown; frontovertex and mesoscutum with green reflection; scutellum with golden green metallic reflection. Ocelli forming an obtuse triangle; malar space approximately 0.5 × as long as eye length. Scape approximately 6.2 × as long as broad; apical half of scape and basal half of pedicel yellow brown, rest of antennae pale yellow to yellow; F 1 – F 3 slightly longer than broad (1.1 – 1.3 ×), F 4 – F 5 quadrate. Mesoscutum with notaular lines complete, reaching posterior margin; mesoscutum with fine, scale-like sculpture; scutellum with coarse, polygonal sculpture. Fore wing about 2.4 × as long as wide; venation brown, less than half (0.44 ×) length of fore wing. Legs yellow. Gaster about 1.5 × as long as mesosoma; ovipositor slightly exserted, visible externally, 0.64 × as long as mid tibia.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8904AE1DFF43B71FFE70FF72.taxon	description	Description. A detailed description was provided by Zu & Li (2016).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8904AE1DFF43B71FFE70FF72.taxon	biology_ecology	Host. Unknown	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8904AE1DFF43B71FFE70FF72.taxon	distribution	Distribution. China (Yunnan).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8904AE1EFF43B2C4FFA4FA49.taxon	diagnosis	Diagnosis: Body length about 0.8 − 1.6 mm; head and mesosoma generally metallic blue or green, metasoma with faint metallic reflection; funicle 5 - segmented; clava 3 - segmented, rarely entire; mesoscutum with notaular lines present, but superficial and inconspicuous, occasionally absent or incomplete; fore wing hyaline to weakly infuscate, with marginal vein punctiform or absent; postmarginal vein virtually absent; hypopygium reaches the apex of the gaster, often extending beyond the apex of the last tergite and completely enclosing the ovipositor; the third valvula often exposed and curves upward. Male hardly differing from female, clava entire, pedicel sometimes enlarged; parameres not developed, digiti elongate, each with one or two apical spines.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8907AE1BFF43B045FDFDFA17.taxon	description	urn: lsid: zoobank. org: act: 6023 ACC 2 - 8 E 07 - 4 CDC- 844 E-B 805 CA 208859 (Figs. 1 A−C, 2 A−G)	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8907AE1BFF43B045FDFDFA17.taxon	materials_examined	Holotype ♀, CHINA, Jianhxi, Dayu, 1. VIII. 1985, ex. Cacopsylla chinensis, Coll. C. F. Li (deposited in IZCAS). Paratypes. 2 ♀♀, same data as holotype. Other material. CHINA, 4 ♂♂, Shandong, Liaocheng, 15. VIII. 1955, Coll. J. L. Mao; Hebei, Zhuozhou, 30. V. 1991, ex. Cacopsylla betulaefoliae, Coll. F. S. Li; 2 ♀♀, Beijing, Changping, 7 - VII- 1991, ex. Cacopsylla betulaefoliae, Coll. F. S. Li; 2 ♀♀, 1 ♂, Shaaxi, Liuba, 9. VII. 1999, Coll. C. D. Zhu; 1 ♂, Gasu, Wenxian, 9. VII. 1999, Coll. C. D. Zhu.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8907AE1BFF43B045FDFDFA17.taxon	diagnosis	Diagnosis. Female. Body length including ovipositor about 1.0 − 1.4 mm; ocelli form acute angle of slightly less than 90 °; funicle segments with only F 4 longer than broad, the other segments subquadrate; clava 3 - segmented, as long as F 2 − F 5 combined; notauli incomplete; all coxae and femora dark brown; mid tibia marked with dark brown, fore and hind tibiae dark brown; mid tarsus and spur yellow; MT about 1.2 × as long as OL.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8907AE1BFF43B045FDFDFA17.taxon	description	Description. Female (Holotype). Length about 1.1 mm. Body generally dark brown with a faint metallic dark sheen on mesoscutum; scutellum with bright, metallic blue reflections contrasting with the dark mesoscutum; pedicel dark brown; scape dark brown, except apically narrowly brown, funicle and clava brown; tegula entirely dark brown; axilla with faint metallic dark-blue sheen; all coxae dark brown; fore and hind femur dark brown, mid femur except basal 1 / 5 and apex dark brown; fore and hind tibiae except apex dark brown; mid tibia basally with a dark brown spot, the rest brownish yellow; fore wings hyaline, venation brown. Head. Head covered with thimble-like sculpture; HW approximately 2.7 × HL; FV about 0.3 × HW; ocelli forming an angle slightly less than 90 o; the distance from the posterior ocellus to the inner eye margin about 0.4 × that to the occipital margin; OCL about 1.1 × diameter of posterior ocellus; OOL about 0.3 × diameter of posterior ocellus; POL about 2.9 × diameter of posterior ocellus; antenna with scape approximately 4.9 × as long as broad; pedicel approximately 2.5 × as long as broad, and slightly longer than F 1 − F 3 combined; funicle segments with only F 4 longer than broad, F 1 quadrate, the other segments subquadrate (F 1 1.0 ×, F 2 0.78 ×, F 3 0.86 ×, F 4 1.1 ×, F 5 0.95 ×); clava about 2.2 × as long as broad and as long as F 3 − F 5 combined. Relative measurements: HW 31.3, HL 11.6, FV 9.4, POL 5.6, OCL 1.1, OOL 0.5, MS 8, SL 15, SW 3.1, PL 7, PW 2.8. Mesosoma. Mesoscutum slightly convex, with fine, scale-like sculpture; notaular lines only 1 / 5 indicated; MSW about 1.5 × MSL; scutellum covered with lineolate reticulate sculpture which is clearly deeper than that on mesoscutum; STW about 1.04 × STL; axilla with very shallow reticulations; fore wing approximately 2.5 × as long as broad; linea calva closed by 1 – 2 lines of setae posteriorly; basal cell with a naked area at base; marginal vein punctiform, postmarginal vein virtually absent; mid tibial spur about as long as the mid basitarsus. Relative measurements: FWL 67.5, FWW 30, MV 1.5, STV 5. Metasoma. About 1.2 × as long as mesosoma; hypopygium extending to apex of gaster; ovipositor nearly as long as mid tibia, not exserted. Relative measurements: OL 22.5. Male. Length about 0.6 − 1.0 mm. Like female except for antenna and genitalia (Fig. 3).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8907AE1BFF43B045FDFDFA17.taxon	biology_ecology	Host. Cacopsylla betulaefoliae Yang & Li (1981).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8907AE1BFF43B045FDFDFA17.taxon	distribution	Distribution. China (Jiangxi, Beijing, Gansu, Hebei, Shandong, Shaani).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8907AE1BFF43B045FDFDFA17.taxon	etymology	Etymology. The specific name refers to its host name.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8907AE1BFF43B045FDFDFA17.taxon	discussion	Comments. Trechnites cacopsyllae was erroneously treated as Psylledontus insidiosus Crawford, 1910 in Zhang (1992). The currently accepted valid name for P. insidiosus is Trechnites insidiosus (Crawford). Trechnites cacopsyllae sp. nov. is morphologically very similar to Trechnites insidiosus, but can be clearly distinguished by a combination of the following characters: scape about 5.2 × as long as broad (in T. cacopsyllae scape about 4.9 × as long as broad); mesoscutum with notauli reaching about 1 / 3 across mesoscutum (in T. cacopsyllae reaching about 1 / 5 across mesoscutum).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8901AE1AFF43B4E1F820F9FE.taxon	description	(Figs. 3 A−C)	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8901AE1AFF43B4E1F820F9FE.taxon	materials_examined	Material examined. CHINA, 3 ♀♀, 2 ♂♂, Hainan, Jianfeng Mt. 06. VI. 1998, Coll. D. X. Liao; 1 ♂, Fujian, Longyan, 12. IX. 1996, Coll. H. Xiao; 1 ♀, 1 ♂, Fujian, Shanghang, 18. IX. 1996, Coll. H Xiao.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8901AE1AFF43B4E1F820F9FE.taxon	diagnosis	Diagnosis. Female. Body length approximately 1.2 – 1.5 mm, mostly dark brown. Mesoscutum with a faint metallic dark sheen; scutellum with bright, metallic green sheen contrasting with the dark mesoscutum; tegula dark brown; apical 1 / 3 of scape and basal half of pedicel brown, funiculars and clava yellow; all coxae and femora dark brown; mid tarsus and spur yellow. Malar space about 0.48 × as long as eye length; ocelli forming an obtuse triangle; scape approximately 5.3 × as long as broad; F 1 to F 3 broader than long (about 0.8 – 0.9 ×), F 4 and F 5 quadrate; mesoscutum with notauli complete, extending to its posterior margin; sculpture on scutellum deeper than that on mesoscutum; fore wing more than 2.8 × as long as broad; ovipositor often visible and exserted; OL about 1.3 × MT.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8901AE1AFF43B4E1F820F9FE.taxon	description	Description. A detailed description was provided by Kazmi & Hayat (1995).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8901AE1AFF43B4E1F820F9FE.taxon	biology_ecology	Host. Unknown.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8901AE1AFF43B4E1F820F9FE.taxon	distribution	Distribution. China (Hainan, Fujian) (Zhang & Huang, 2004), India (Hayat, 1995).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8900AE17FF43B7B1F96AFE7F.taxon	description	urn: lsid: zoobank. org: act: A 4 B 278 BE- 7 FA 1 - 4 A 3 B- 8195 - 6 A 9450 D 882 A 7 (Figs. 4 A−C, 5 A−G)	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8900AE17FF43B7B1F96AFE7F.taxon	materials_examined	Holotype ♀ (on slide), CHINA, Qinghai, Qilian Mt., 16. VII. 2001, Coll. X. M. Dou (deposited in IZCAS). Paratypes. 3 ♀♀, same data as holotype. Other material. CHINA, 2 ♀♀, Qinghai, Golmud, 14. IX. 2001, Coll. C. D. Zhu; 1 ♀, Xizang, Naidong, 19. VI. 1981, Coll. T. L. Chen; 2 ♀♀, Xizang, Lasa, 27. VIII. 2001, Coll. C. D. Zhu; 1 ♀, Xizang, Changdu, 15. VIII. 2001, Coll. C. D. Zhu; 1 ♀, Sichuan, Emei Mt., 18. VI. 1955, Coll. K. R. Huang; 1 ♀, Sichuan, Dege, 15. VIII. 2001, Coll. C. D. Zhu.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8900AE17FF43B7B1F96AFE7F.taxon	diagnosis	Diagnosis. Female. Body length including ovipositor about 1.2 − 1.5 mm; ocelli forming right angled triangle; all funicle segments longer than broad, F 3 and F 5 only slightly longer than broad; clava 3 - segmented, as long as F 3 − F 5 combined; notauli incomplete (Fig. 5 F); all coxae and femora dark brown (Fig. 5 C−E); mid tibia marked with dark brown, fore and hind tibiae dark brown; mid spur dark brown (Fig. 5 D); MT about 1.2 × as long as OL.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8900AE17FF43B7B1F96AFE7F.taxon	description	Description. Female (Holotype). Length about 1.4 mm. Body generally dark brown; only face, vertex and mesonotum with green sheen. Scape and pedicel dark brown, except apically brownish-yellow; funicle brown; tegula entirely dark brown; axilla with blue-green sheen; all coxae dark brown; fore femur, mid femur except basal 1 / 6 and hind femur dark brown; fore and hind tibiae except apex dark brown; mid tibia basally with a dark brown ring, mid tibia spur dark brown; mid tarus usually dark brown, rarely yellowish white basally (Fig. 4 C), the other parts of legs brownish yellow to yellow; fore and hind tarsi brownish yellow, mid tarsi dark brown; fore wings hyaline, venation brown. Head. Head with fine reticulate sculpture; HW approximately 2.9 × HL; FV about 0.4 × HW; ocelli forming an angle of about 90 o; the distance from the posterior ocellus to the inner eye margin equals that to the occipital margin; OCL about 1.1 × diameter of posterior ocellus; OOL about 1.1 × diameter of posterior ocellus; POL about 4.8 × diameter of posterior ocellus; antenna with scape approximately 4.2 × as long as broad; pedicel approximately 3.0 × as long as broad, about 3.1 × as long as F 1; all funicle segments longer than broad (F 1 1.4 ×, F 2 1.4 ×, F 3 1.1 ×, F 4 1.5 ×, F 5 1.1 ×); clava about 2.4 × as long as broad and as long as F 3 − F 5 combined. Relative measurements: HW 33, HL 12, FV 14, POL 7.6, OCL 1.4, OOL 1.4, MS 11.1, SL 17, SW 4.0, PL 8.1, PW 2.7. Mesosoma. Mesoscutum slightly convex, covered with fine, scale-like sculpture; notaular lines indicated only anteriorly; MSW about 1.67 × MSL; scutellum covered with lineolate to reticulate sculpture and clearly deeper than that on mesoscutum; STL about 1.33 × STW; axilla with very shallow reticulations; fore wing approximately 2.7 × as long as broad; linea calva closed by 1 – 2 lines of setae posteriorly; basal cell with a naked area at base; marginal vein punctiform, postmarginal vein virtually absent; mid tibial spur almost as long as the mid basitarsus. Relative measurements: FWL 76, FWW 28, MV 1.8, STV 6. Metasoma. About 1.1 × as long as thorax; cercal plates located in the apical 2 / 3 of gaster; hypopygium extending to apex of gaster; ovipositor sheets slightly exserted, ovipositor nearly as long as mid tibia, and often visible in dorsal view. Relative measurements: OL 23.6. Variation. The basitarsus are not always dark brown; occasionally they are yellow (Fig. 4 C). Male. Unknown.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8900AE17FF43B7B1F96AFE7F.taxon	biology_ecology	Host. Unknown.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8900AE17FF43B7B1F96AFE7F.taxon	distribution	Distribution. China (Qinghai, Xizang, Sichuan).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8900AE17FF43B7B1F96AFE7F.taxon	etymology	Etymology. The specific name refers to the mountain habitat of this species. From the Latin for mountain dweller, monticola (a noun).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F8900AE17FF43B7B1F96AFE7F.taxon	discussion	Comments. This species can be distinguished from other Chinese congeners by its dark brown mid tibia spur, but may be close to T. fuscitarsis due to the shared trait of having dark mid tarsi. It can be separated from T. fuscitarsis by a combination of the following characters: scape about 4.2 × as long as broad (in T. fuscitarsis scape about 5.8 × as long as broad); all funicle segments longer than broad (in T. fuscitarsis F 3 and F 5 quadrate).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890DAE16FF43B349FE1CFD46.taxon	description	(Figs. 6 A−C)	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890DAE16FF43B349FE1CFD46.taxon	materials_examined	Material examined. CHINA, 2 ♀♀, 7 ♂♂, Xinjiang, Altai, 14. VI. 2023, Coll. B. Y. Zou.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890DAE16FF43B349FE1CFD46.taxon	diagnosis	Diagnosis. Body length 1.1 – 1.3 mm, generally dark brown with bright metallic green sheen on mesoscutum, scutellum and sides of gaster; tegula dark brown; apical half of scape brown, the rest yellow; basal half of pedicel brown, funicle and clava yellow; legs yellow (Fig. 6 A); fore wing hyaline, venation brown. Ocelli forming an obtuse triangle; malar space approximately 0.4 × as long as eye height; scape 5 × as long as broad; F 1 – F 4 approximately as long as broad, F 5 slightly broader than long (0.9 ×); linear sensilla on F 4 – F 6 and clava. Mesoscutum with notauli complete, reaching posterior margin; scutellum more deeply sculptured than mesoscutum. Fore wings hyaline, 2.3 × as long as broad; venation brown; legs yellow; last tarsal segment brown; fore tibia sometimes suffused with brown; ovipositor slightly exserted, OL about 1.0 × MT.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890DAE16FF43B349FE1CFD46.taxon	discussion	Remark. Among the specimens examined, some have a scape brownish in the apical half while others have the scape completely light colored; we consider this variation within a species. Guerrieri & Noyes (2009: 253) also mentioned that apical half of scape is brown while the rest is yellow. However, the flagellum in the Chinese specimens is also light brown, similar to the apex of the scape, and not yellow as in the European material (Guerrieri & Noyes, 2009). We consider this also as variability within the same species.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890DAE16FF43B349FE1CFD46.taxon	biology_ecology	Host. An unidentified psyllid on Halimodendron halodendron (Pall.) Voss; Eulecanium franconicum Lindinger (Herting, 1972; Trjapitzin, 1989).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890DAE16FF43B349FE1CFD46.taxon	distribution	Distribution. Armenia (Trjapitzin, 1989); Czech Republic (Kalina, 1989); Denmark (Trjapitzin, 1989); France (Trjapitzin, 1989); Hungary (Trjapitzin, 1989); Italy (Guerrieri & Noyes, 2009); Kazakhstan (Trjapitzin, 1989); Mongolia (Trjapitzin, 1989); Poland (Herting, 1989); Russia (Trjapitzin, 1989); Spain (Noyes, 1981); Turkey (Trjapitzin, 1989); China (new record).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890CAE16FF43B211FE70FA30.taxon	materials_examined	Material examined. Holotype. ♀, CHINA, Yunnan, Longchuan, 26 − 28. IV. 2013, Coll. G. H. Zu, H. L. Han, X. X. Jin and C. Zhang.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890CAE16FF43B211FE70FA30.taxon	diagnosis	Diagnosis. Body length 1.1 – 1.2 mm, generally dark brown. Frontovertex with blue metallic reflection; scutellum with bright green reflection, contrasting with mesoscutum. Ocelli forming a nearly right triangle. Malar space about 0.4 × as long as eye length. Scape about 5.9 × as long as broad, apical third yellow, basal two-thirds dark brown; pedicel mostly dark brown; F 1 and F 4 quadrate, F 2, F 3 and F 5 slightly broader than long (0.80 – 0.83 ×); clava 3 - segmented, about 2.5 × as long as wide, slightly longer than F 3 – F 5 combined. Mesoscutum with notaular lines complete, meeting before posterior margin; mesoscutum with scale-like sculpture; scutellum with longitudinally lineolate-reticulate sculpture. Fore wing hyaline, no more than 2.3 × as long as wide; venation brown. Legs with all coxae, femora (except basal 1 / 4 of mid femora), about basal half of fore tibiae and hind tibiae brown to dark brown, remaining parts pale yellow. Gaster approximately as long as mesosoma; ovipositor slightly exserted, 0.86 × as long as MT.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890CAE16FF43B211FE70FA30.taxon	description	Description. A detailed description was provided by Zu & Li (2016).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890CAE16FF43B211FE70FA30.taxon	biology_ecology	Host. Unknown	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890CAE16FF43B211FE70FA30.taxon	distribution	Distribution. China (Yunnan).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890CAE13FF43B702F948FEEE.taxon	description	(Figs. 7 A−C, 8 A−H)	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890CAE13FF43B702F948FEEE.taxon	materials_examined	Holotype ♀, CHINA, Guangxi, Shangsi, 07. VII. 2005, Coll. Y. Z. Zhang. (deposited in IZCAS). Paratype. 1 ♀, same data as holotype. Other material. CHINA, 1 ♀, 2 ♂♂, Yunnan, Lijiang, 06. VIII. 1984, Coll. CF Li; 1 ♀, 1 ♂, Guangxi, Jinxiu, 30. VII. 2001, Coll. Y. Z. Zhang; 1 ♀, 2 ♂♂, Yunnan, Xishuangbanna, 13. XI. 2002, Coll. W. J. Zhen.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890CAE13FF43B702F948FEEE.taxon	diagnosis	Diagnosis. Female. Body length including ovipositor about 1.2 − 1.5 mm; ocelli forming an acute triangle; antenna with F 3 − F 5 longer than broad, F 1 and F 2 quadrate (Fig. 8 A); clava 3 - segmented, as long as F 3 − F 5 combined; notauli incomplete; all coxae dark brown; fore and hind femora dark brown, mid femur dark brown except base and apex yellow; mid spur yellow; MT about 1.1 × as long as OL.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890CAE13FF43B702F948FEEE.taxon	description	Description. Female (Holotype). Length about 1.3 mm. Body generally dark brown. Mesoscutum with a faint metallic dark sheen; scutellum with bright, metallic blue reflections contrasting with the dark mesoscutum (Fig. 7 B); scape yellow brown, basal half of pedicel dark brown, funicle and clava yellow-brown; tegula entirely dark brown; axilla with faint metallic dark sheen; all coxae dark brown; base of mid femora narrowly yellow, the rest dark brown; fore and hind femora dark brown; tibiae except apical 1 / 5 dark brown; mid spur yellow, mid tarsus pale brown; fore wings hyaline, venation brown. Head. Head with reticulate sculpture; HW approximately 2.2 × HL; FV about 0.4 × HW; ocelli forming an angle of about 70 o (Fig. 7 C); OCL about 1.5 × diameter of posterior ocellus; OOL about 0.2 × diameter of posterior ocellus; POL about 2.5 × diameter of posterior ocellus; antenna with scape approximately 5.5 × as long as broad; pedicel approximately 2.7 × as long as broad, about 4 × as long as F 1; F 1 quadrate, F 2 slightly broader than long, the rest of funicle segments longer than broad (F 1 1.0 ×, F 2 0.9 ×, F 3 1.2 ×, F 4 1.3 ×, F 5 1.2 ×); clava about 2.4 × as long as broad and as long as F 3 − F 5 combined. Relative measurements: HW 30, HL 13, FV 12, POL 6, OCL 2.5, OOL 0.6, MS 9.2, SL 15, SW 2.7, PL 6.6, PW 2.4. Mesosoma. Mesoscutum covered with reticulate sculpture; notaular lines only anteriorly indicated; MSW about 1.8 × MSL; scutellum covered with lineolate reticulate sculpture and clearly deeper than that on mesoscutum; STL about 1.45 × STW; axilla with very shallow reticulations; fore wing approximately 2.5 × as long as broad; linea calva closed by 1 – 2 lines of setae posteriorly; basal cell with a naked area at base; marginal vein punctiform, postmarginal vein virtually absent; mid tibial spur almost as long as the mid basitarsus. Relative measurements: FWL 71, FWW 28.4, MV 1.1, STV 4.6. Metasoma. About 1.1 × as long as thorax; cercal plates located in the apical 3 / 5 of gaster; hypopygium extending to apex of gaster; ovipositor sheets slightly exserted, ovipositor nearly as long as mid tibia, and often visible in dorsal view. Relative measurements: OL 25.2 Male. Length about 0.8 − 1.1 mm. Like female except for antenna and genitalia (Fig. 8 H, G)	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890CAE13FF43B702F948FEEE.taxon	biology_ecology	Host. Unknown.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890CAE13FF43B702F948FEEE.taxon	distribution	Distribution. China (Guangxi, Yunnan).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890CAE13FF43B702F948FEEE.taxon	etymology	Etymology. The specific name refers to the locality where the holotype was collected.	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
955D853F890CAE13FF43B702F948FEEE.taxon	discussion	Comments. The new species is similar to T. assamensis Manickavasagam and Ayyamperumal, 2018, but can be separated from T. assamensis by a combination of the following characters: scape about 5.5 × as long as broad (in T. yunnanensis, scape about 5.8 × as long as broad); F 3 − F 5 longer than broad (in T. yunnanensis F 5 wider than long); mid femora and tibiae except apical 1 / 5 dark brown (in T. yunnanensis only base of tibiae dark brown).	en	Zou, Bo-Yu, Zu, Guo-Hao, Zhang, Yan-Zhou (2026): A taxonomic study of Trechnites Thomson (Hymenoptera: Encyrtidae) from China. Zootaxa 5763 (3): 407-420, DOI: 10.11646/zootaxa.5763.3.6, URL: https://doi.org/10.11646/zootaxa.5763.3.6
