♂, Satun (Koh Tarutao), Thailand.		♀, Satun (Koh Tarutao), Thailand.
♂, Pattani, Thailand.		♂, Ranong, Thailand.

ON : Euthalia phemius ipona Fruhstorfer, 1913 OD : in Seitz, Grossschmett Erde 9:675. TL : Perak. (♂, NHML) Distribution : P.Thailand (Ranong and Southward), Langkawi, W.Malaysia. ● ssp.phemius ● ssp.ipona

Euthalia phemius corbeti Pendlebury, 1939 : J. Fed. Malay St. Mus. 18(3):389-390, pl.6, fig.15,♂. TL. Langkawi Islands, Malaya. (♂, NHML)

ipona : Syntype ♂, 'Cunong Ijan', Perak, Malaysia (NHML) ; Yago et al.,2012 : 306, figs.3A♂,3B♂(Un).
corbeti : Holotype ♂, Langkawi Islands, Malaya. (NHML)

[ THAILAND ]
Euthalia ipona ; Pinratana,1979 : 76, figs.N132,♂,♀,♀(Un). (Nakhon Sri Thammarat; Satun; Ranong; Yala)
Euthalia ipona ; Pinratana & Eliot,1996 : 78, pl.78, figs.144,♂,♀. (Nakhon Sri Thammarat; Satun; Ranong; Tarutao Is.)
Euthalia ipona ; Ek-Amnuay,[2007] : 442, pl.195, figs.N151,♂,♂(Un),♂(Un),♀,♀(Un). (Koh Tarutao; Muang Shone)
Euthalia ipona ; Les Day,2011-2022 : Samui Butterflies, figs. (Koh Samui; Koh Phangan) (accessed: 2021.07.23)
Euthalia ipona ; Ek-Amnuay,2012 : 452, pl.199, figs.N317,♂,♂(Un),♂(Un),♀,♀(Un). (Koh Tarutao; Muang Shone)
Euthalia phemius phemius ; Kimura et al.,2016 : 107, figs.♂,♂(Un),♂,♂(Un),♀,♀(Un). (Khlong Naka; Tarutao; Than To WF.) (in part)

[ THAILAND ]
Ranong : 2♂.

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Surat Thani (Koh Phangan dist.) : 1♂ (photo by A.Giudici).

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Nakhon Si Thammarat : 1♂ 1♀ (photo & photo by A.Giudici).

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Pattani : 1♂.

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Satun (Koh Tarutao) : 2♂ 1♀.

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The butterfly is not uncommon in montane forest at low to moderate elevations (Alt.30m - 550m).
Yago et al.,2012, based on both morphology and molecular analyses, regarded ipona as a form of nominotypical subspecies. However, in peninsular Thailand, only ipona form is found in both males and females, and these are stable. In Malay Peninsula, individuals that are indistinguishable from nominotypical subspecies seem to occur very rarely in mountainous areas. It is possible that this is regressed and relicty form that inhabits mountainous areas, while ipona may be a population that inhabits mainly lowland areas. The ratio of this form of occurrence needs to be examined, but as per the traditional classification, I tentatively treat the populations from P.Thailand to W.Malaysia as ssp.ipona. Further taxonomic study is needed.

Fruhstorfer, H.,1913 : 6. Familie: Nymphalidae in Seitz, Gross-Schmett. Erde 9
665-680. (13.Jan.1913)

Pendlebury, H.M.,1939 : Notes on some new or little-known Malaysian Butterflies
J. Fed. Malay St. Mus. 18(3):380-394, pl.6.

Yago, M., Yokochi, T., Kondo, M., Braby, M.F., Yahya, B., Peggie, D., Wang, M., Williams, M., Morita, S. & Ueshima, R.,2012 :
Revision of the Euthalia phemius complex (Lepidoptera: Nymphalidae) based on morphology and molecular analyses
Zool. J. Linn. Soc. 164:204-324.

♂, Surat Thani (Koh Phangan), Thailand. (photo by A.Giudici)	♀, Nakhon Si Thammarat, Thailand. (photo by A.Giudici)
♂, Nakhon Si Thammarat, Thailand.

2007.02.10 - 2021.09.30.