Allotinus yamaguchii

Allotinus yamaguchii Saito & Inayoshi, 2026


♂, 1999.09.11. Phu Pha Thaep, Mukdahan, Thailand Holotype (photo by RIEB)		♀, 1997.08.31. Phu Pha Thaep, Mukdahan, Thailand Paratype (photo by RIEB)

♂, 2024.02.06. Chiang Mai, Thailand. Paratype		♀, 2024.02.06. Chiang Mai, Thailand. Paratype

♂, 2025.02.16. Chiang Mai, Thailand. Paratype		♂ genitalia, Chiang Mai, Thailand. Paratype

ON : Allotinus yamaguchii Saito & Inayoshi, 2026
OD : Butterflies 98: 23, 26, figs.14(HT,♂), 14v(HT,♂Un), 15(PT,♂), 15v(PT,♂Un), 16(PT,♀), 16v(PT,♀Un), 17(PT,♀), 17v(PT,♀Un), 19:a-d(♂genitalia), 20(♂,brand), 21(UnH, base).
TL : Phu Pha Thaep, Mukdaharn, Ubon Ratchathani, E.Thailand. (RIEB)

Distribution : N. & E.Thailand, Laos.

Type Materials Information

Holotype ♂, 11.Sep.1999, Phu Huai Sing, Mukdahan, E.Thailand, S.Yamaguchi & M.Akiyama leg. (RIEB)
Paratypes (6♂ 7♀): 1♂ 2♀, Mukdahan, E.Thailand; 5♂ 5♀, Chiang Mai (Mae Chaem Dist.; Mae On Dist.), N.Thailand. (RIEB; in coll. YI ; KS)

Records taken from Literature

[ THAILAND ]
Allotinus corbeti ; Yamaguchi & Aoki,2002 : 32, fig.91,♀. (Mukdahan: Phu Huay Sing)
Allotinus corbeti ; Yamaguchi, Aoki & Akiyama,2005 : 53. (Mukdahan: Phu Huai Sing)
Allotinus corbeti ; Kimura et al.,2014 : 41, figs.♂,♂(Un). (Phu Huai Sing) (partim)
Allotinus corbeti ; Inayoshi,1999-2025 : Butterflies in Indo-China. (by literature) (partim) (28.Feb.2025 last updated ; 28.Feb.2026 changed.)

[ LAOS ]
Allotinus substrigosa ssp. ; Motono & Negishi,1989 : 68, pl.98, fig.B5,♀(Un). (Vientiane).
Allotinus corbeti ssp. ; Osada, Uémura & Uehara,1999 : 214, pl.107, fig.♀(Un). (Attapu)
Allotinus corbeti ; Nakamura & Wakahara,2012 : 51.
Allotinus corbeti ; Inayoshi,1999-2025 : Butterflies in Indo-China. (by literature) (28.Feb.2025 last updated ; 28.Feb.2026 changed.)

Specimens Examined

[ THAILAND ]
Chiang Mai : 5♂ 5♀ (incl. Paratypes), (2♂ genitalia dissected).

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Mukdahan : 2♂ 2♀ (Holotype and Paratypes), (1♂ genitalia dissected).

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Notes

This species has long been thought to be the continental population of Allotinus corbeti since Osada et al. (1999), but the male genitalia is completely different. Characteristics of this taxon are highly similar to Allotinus nicholsi Moulton, 1911 from Borneo and Sumatra.
This species has a unique characteristic. It has cornuti in its aedeagus. This is only shared by Allotinus nicholsi and this species within the genus Allotinus. Although many of its basic characteristics suggest that it belongs to the subgenus Paragerydus, it also exhibits features typical of the subgenus Allotinus. Kaliszewska et al. (2014) stated that A. nicholsi belongs to the subgenus Paragerydus. Here, it is provisionally classified as belonging to the subgenus Paragerydus, but further taxonomic study is needed.

The butterfly is quite localized and uncommon in montane forests at moderate elevations (Alt. 700 - 900m). Males are territorial on trees or undergrowth from 10:30 to 11:30 occurring only around the host plant, and 15:30 to 16:00 at hilltops. Further distributional research is needed.

Literature

Saito, K. & Inayoshi, Y.,2026 : Description of two new species and two new subspecies of Lycaenidae from Thailand.
Butterflies 98: 20-32.

Eliot, J.N.,1986 : A review of the Miletini (Lepidoptera: Lycaenidae).
Bull. Br. Mus. nat. Hist. (Ent.) 53(1): 1-105, 108 figs.

Kaliszewska, Z.A., Lohman, D.J., Sommer, K., Adelson, G., Rand, D.B., Mathew, J., Talavera, G. & Pierce, N.E.,2014 :
When caterpillars attack: Biogeography and life history evolution of the Miletinae (Lepidoptera: Lycaenidae).
Evol. 69(3): 571–588.


♂ (territorial behaviour), Chiang Mai, Thailand.	♂ (territorial behaviour), Chiang Mai, Thailand.

♂ (territorial behaviour), Chiang Mai, Thailand.

2026.03.31.