♂, Chiang Mai, Thailand.		♀, Chiang Mai, Thailand.
♂, Phetchaburi, Thailand.		♂, Chiang Mai, Thailand.

ON : Achlyodes vasava Moore, 1866 OD : Proc. zool. Soc. Lond. 1865(3):786. TL : N.E.Bengal, India. (♂, NHML) Distribution : Sikkim to Myanmar, Thailand, Laos, Vietnam.

[ THAILAND ]
Ctenoptilum vasava vasava ; Godfrey,1930 : 365-366. (W: Huey Tak So)
Ctenoptilum vasava vasava ; Evans,1949 : 157. (Siam)
Ctenoptilum vasava vasava ; Pinratana,1985 : 44, pl.16, fig.78,♂. (Chiang Mai; Chaiyaphum; Nong Khai; Nakhon Ratchasima)
Ctenoptilum vasava vasava ; Yamaguchi & Aoki,2002 : 11, fig.12,♂. (Mukdahan: Ban Na Lak)
Ctenoptilum vasava vasava ; Katsuyama et al.,2006 : 44, fig.7,♂. (Nan: Ban Nam Poon)
Ctenoptilum vasava vasava ; Ek-Amnuay,[2007] : 768, pl.353, figs.H95,♂,♂,♂(Un). (Chiang Mai)
Ctenoptilum vasava vasava ; Kimura et al.,2011 : 49, figs.♂,♂(Un),♀,♀(Un). (Doi Par Hom Pok; Chiang Dao; Doi Suthep; Bung Kahn; Phu Khiewo; Muang Shone)
Ctenoptilum vasava vasava ; Ek-Amnuay,2012 : 820, pl.378, figs.H92,♂,♂,♂(Un). (Chiang Mai)
Tapena vasava vasava ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2024- : Butterflies of Thailand, figs. (Chiang Mai; Phitsanulok; Phetchabun; Chaiyaphum) (accessed: 2024.06.17)

[ LAOS ]
Ctenoptilum vasava vasava ; Motono & Negishi,1989 : 80, pl.112, figs.A1,♂,A2,♂(Un). (Vang Vieng)
Ctenoptilum vasava vasava ; Osada, Uémura & Uehara,1999 : 222, pl.136, fig.♂. (Nhahin)
Ctenoptilum vasava vasava ; Nakamura & Wakahara,2012 : 58.
Ctenoptilum vasava vasava ; Onodera,2022 : 107, pl.242, figs.♂,♂(Un),♀,♀(Un). (Bolikhamxai: Thabok; Oudomxai)

[ VIETNAM ]
Ctenoptilum vasava vasava ; Inoué & Kawazoé,1965b ; 98-100, figs.63.♂,64.♂(Un). (Dinh Quan)
Ctenoptilum vasava vasava ; Monastyrskii & Devyatkin,2015 : 75. (N: Tonkin, Van Bu / S: Dong Nai)

[ THAILAND ]
Mae Hong Son : 1♂.

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Chiang Mai : 12♂ 1♀ (incl. photo).

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Nan : 1♂.

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Tak : 1♂.

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Phetchaburi : 1♂.

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[ LAOS ]
Oudomxai : 1♀ (photo by H.Onodera).

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Xieng Khouang : 1♂ (photo by H.Onodera).

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Bolikhamxai : 1♂ (photo by H.Onodera).

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The butterfly is locally common in montane forests at low to moderate elevations (Alt. 300 - 900m). Males frequently come to the banks of streams and puddles to suck water.
Zhang et al.,2022 treated genus Ctenoptilum as a subgenus of Tapena on the basis of molecular analysis and morphology.

Moore, F.,1866 : On the lepidopterous insects of Bengal.
Proc. zool. Soc. Lond. 1865(3):755-822, 3 pls.

Zhang, J., Cong, Q., Shen, J. & Grishin, N.V.,2022 : Taxonoic changes suggested by the genomic analysis of Hesperiidae (Lepidoptera)
Insecta Mundi 0921: 1-135.

♂, Chiang Mai, Thailand.
♂, Chiang Mai, Thailand.	♂ with A. angulata, Chiang Mai, Thailand.

1999.09.04 - 2024.06.30.