♂, Surat Thani (Koh Samui), Thailand. (photo by K.Saito)		♀, Surat Thani, Thailand. (photo by K.Lechner)
♂, Surat Thani (Koh Phangan), Thailand. (photo by A.Cotton)		♂, Surat Thani (Koh Phangan), Thailand. (photo by A.Cotton)

ON : Byasa adamsoni takakoae Uehara, 2006 OD : Butterflies 43:4-5. figs.1(HT,♂).2(HT,♂Un). TL : Koh Samui, Surat Thani, Thailand. (♂, in coll. Y.Harada) Distribution : P.Thailand. (Surat Thani: Koh Samui; Koh Phangan; Nakhon Si Tammarat) ● ssp.adamsoni ● ssp.takakoae

Holotype ♂, 02.Oct.2005. Hinlad Water Fall, Koh Samui, Surat Thani, Thailand. T.Harada leg. (in coll. Y.Harada)
Paratype ; 1♂, 23.Mar.2006. Ramai River, Koh Samui, Surat Thani, Thailand. Y.Harada leg. (in coll. Y.Harada)

[ THAILAND ]
Atrophaneura adamsoni ; Pinratana,1977 : 14, figs.P8b♂,♂(Un). (Nakhorn Sri Thammarat)
Atrophaneura adamsoni ; Ek-Amnuay,[2007] : 72, not fig. ('Than To' [loc.err.]) (in part)
Byasa adamsoni takakoae ; Racheli & Cotton,2010 : 57-58, figs.♂,♂(Un),♀,♀(Un). (S: Surat Thani: Koh Samui; Nakhorn Srithammarat)
Atrophaneura adamsoni takakoae ; Les Day,2011-2022 : Samui Butterflies, figs.♂,♂(Un). (Koh Samui) (accessed: 2021.06.06)
Byasa adamsoni takakoae ; Kimura et al.,2011 : 116.
Atrophaneura adamsoni takakoae ; Ek-Amnuay,2012 : 72, not fig. ('Than To' [loc.err.]; Surat Thani) (in part)

[ THAILAND ]
Surat Thani (Don Sak dist ; Koh Samui ; Koh Phangan) : 9♂ 1♀ (incl. photo by A.Giudici).

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The butterfly is uncommon in montane and secondary forests at low elevations. Both sexes visit flowers.
Ek-Amnuay ([2007],2012) recorded it from 'Than To, Yala', however this is considered to be an erroneous location or a misidentification of Pachliopta aristolochiae.

Uehara, J.,2006 : A new subspecies of Byasa adamsoni (Grose-Smith) (Lepidoptera: Papilionidae) from South Thailand.
Butterflies 43:4-5, 4 figs.

♂, Surat Thani (Koh Phangan), Thailand. (photo by A.Giudici)

2006.10.03 - 2021.10.31.