♂, 2005.03.--, Ha Giang, Vietnam. (photo by K.Saito)		♀, 2005.06.--, Lao Cai, Vietnam. (photo by K.Saito)

ON : Tongeia ion hatuyenensis Sakai, 2024 OD : Pallarge 12: 15, figs.87(HT,♂), 88(HT,♂Un). TL : Dong Van, Ha Giang, Ha Tuyen, Vietnam. (in coll. S. Sakai) Distribution : Yunnan, S.Sichuan, N.Vietnam. ● ssp.hatuyenensis ● ssp.meifangae

Holotype ♂, 7.Jun.2014, Dong Van, Ha Giang, Ha Tuyen Prov., Vietnam, LC. (in coll. S. Sakai, it will be donated to RIEB)

[ VIETNAM ]
Tongeia ion: Monastyrskii & Devyatkin,2015 : 50. (N: Ha Giang; Lao Cai)
Tongeia ion: Saito & Vu,2020a : 178. (Ha Giang: Dong Van)
Tongeia amplifascia hatuyenensis: Huang, 2026 : 161. (Dong Van, Ha Giang)
Tongeia amplifascia: Inayoshi,2009–2026 : Butterflies in Indo-China, figs.1♂,1♀. (Ha Giang; Lao Cai) (31.Mar.2026 last update. 30.Sep.2026 changed.)

[ VIETNAM ]
Ha Giang : 1♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Lao Cai : 1♀.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sakai (2024) described hatuyenensis as belonging to T. ion. Subsequently, Huang (2026) treated it as a subspecies of T. amplifascia. Further taxonomic study is needed to clarify its taxonomic status.

Sakai, S, 2024. New or interesting butterflies from Afghanistan, Bhutan, China, India, Japan, Myanmar, Nepal and Vietnam.
Pallarge, 12: 1–42.

Huang, H, 2001. Report of H. Huang's 2000 Expedition to SE.Tibet for Rhopalocera.
Neue entomologische Nachrichten, 51: 65–152.

Yoshino, K, 2023. A review of the genus Tongeia from China with description of a new subspecies of Tongeia davidi Poujade, 1885 (Lycaenidae, Lepidoptera).
Neo Lepidoptera, 5: 23–31.

Huang, H, 2026. A Revision of the Tongeia ion (Leech, 1891) Species Group Based on COI Barcoding and Morphology (Lepidopter [sic], Lycaenidae).
Atalanta, 57(1/2): 159–178.

2026.09.30.