Callerebia dibangensis

Roy’s Argus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Nymphalidae
Genus:	Callerebia
Species:	C. dibangensis
Binomial name
	Callerebia dibangensis; Roy, 2013[1]

Callerebia dibangensis, the Roy’s argus[2] or bright-eyed argus is a species of Satyrinae butterfly found in eastern Himalaya, India.[2][3]

Range

The butterfly is endemic to Upper Dibang Valley and Mayodia pass of Arunachal Pradesh, India.[1]

Description

Male ventral view holotype #982926

Male dorsal view holotype #982926

Male

Holotype: # 982926, 24.vii.1987, male. Forewing length 34mm. 28.880N & 95.850E ±10 km, c.1,830m, Mithun Valley, Upper Dibang Valley District, Arunachal Pradesh, India, coll. Purnendu Roy, the Natural History Museum, London.

Upperside: Ground colour dark chocolate brown, slightly blackish, paler towards margins. Very large round orange-ringed apical ocellus (11mm), black inner with two white pupils. Edges of ring distinct and regular. Hindwing single tornal ocellus in space 2. Narrow reddish ring, black inner and white pupil.

Underside: Ground colour dark chocolate. Forewing apical ocellus large as on upperside, but with an additional thin reddish outer ring. Forewing termen margin covered with a thin scattering of white scales tapering towards tornus. Hindwing white scales forming prominent small lines (striae) with slight violet tones covering the whole wing apart from a narrow area around the tornal ocelli. Striae become darker towards the costa and apex giving a fading effect. In the basal half they are more separate and alternate with the dark brown ground colour producing a distinctive snow-drift like appearance. They are densest towards the discal region in spaces 1, 2 and 3 where they merge with one another. Hindwing two tornal ocelli, ocellus in space 2 much larger than 1c which is blind. Both ocelli orange-ringed with a black centre. Ocellus in space 2 with a white pupil.[1]

Female

Female RFRI-39

Female (RFRI-39):Forewing length 35mm, 28017’21.0N & 95055’16.9E, elevation 2239m, Near Mayodia Pass towards Hunli, Lower Dibang Valley, Arunachal Pradesh, India, 29 August 2013. coll. Arun P. Singh, Ecology & Biodiversity Division, Rain Forest Research Institute, Jorhat, Assam.

Upperside: Ground colour dark chocolate brown, slightly blackish, paler towards margins. Very large round orange-ringed apical ocellus (11mm), black inner with two white pupils. Edges of ring distinct and regular. Hindwing single tornal ocellus in space 2. Narrow reddish ring, black inner and white pupil.

Underside: Ground colour dark chocolate. Forewing apical ocellus large as on upperside, but with an additional thin reddish outer ring. Forewing termen margin covered with a thin scattering of white scales tapering towards tornus. Hindwing white scales forming prominent small striae with slight violet tones covering the whole wing apart from a narrow area around the tornal ocelli. Striae darker towards the costa and apex. In the basal half they are more separate and alternate with the dark brown ground colour producing a distinctive snow-drift like appearance. They are densest towards the discal region in spaces 1, 2 and 3 where they merge with one another. Hindwing has one tornal ocelli with white pupil, in space 2, much larger than 1c and also has a red in the dark space surrounding it. Both the ocelli are orange ringed. Ocellus in space 1 absent in this specimen but may be present as a minute dot in females.[4]

Etymology

Named after the Dibang Valley District in Arunachal Pradesh, India.[1]

References

Roy, P. (2013). "Callerebia dibangensis (Lepidoptera: Nymphalidae: Satyrinae), a new butterfly species from the eastern Himalaya, India". Journal of Threatened Taxa. 5 (13): 4725–4733. doi:10.11609/JoTT.o3293.4725-33. This article incorporates text by P.Roy available under the CC BY 3.0 license.
R.K., Varshney; Smetacek, Peter (2015). A Synoptic Catalogue of the Butterflies of India. New Delhi: Butterfly Research Centre, Bhimtal & Indinov Publishing, New Delhi. p. 179. doi:10.13140/RG.2.1.3966.2164. ISBN 978-81-929826-4-9.
"Callerebia Butler, 1867" at Markku Savela's Lepidoptera and Some Other Life Forms
Singh, A.P. (26 April 2015). "On the female morphs, ecology and male genitalia of Callerebia dibangensis Roy (Lepidoptera: Nymphalidae: Satyrinae) recorded near Mayodia Pass in lower Dibang Valley, Arunachal Pradesh, India". Journal of Threatened Taxa. 7 (5): 7168–7174. doi:10.11609/JoTT.o4035.7168-74. This article incorporates text by A.P. Singh available under the CC BY 4.0 license.

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[Roy-1] Roy, P. (2013). "Callerebia dibangensis (Lepidoptera: Nymphalidae: Satyrinae), a new butterfly species from the eastern Himalaya, India". Journal of Threatened Taxa. 5 (13): 4725–4733. doi:10.11609/JoTT.o3293.4725-33. This article incorporates text by P.Roy available under the CC BY 3.0 license.

[Smetacek-2] R.K., Varshney; Smetacek, Peter (2015). A Synoptic Catalogue of the Butterflies of India. New Delhi: Butterfly Research Centre, Bhimtal & Indinov Publishing, New Delhi. p. 179. doi:10.13140/RG.2.1.3966.2164. ISBN 978-81-929826-4-9.

[Savela_Aulocera-3] "Callerebia Butler, 1867" at Markku Savela's Lepidoptera and Some Other Life Forms

[Singh-4] Singh, A.P. (26 April 2015). "On the female morphs, ecology and male genitalia of Callerebia dibangensis Roy (Lepidoptera: Nymphalidae: Satyrinae) recorded near Mayodia Pass in lower Dibang Valley, Arunachal Pradesh, India". Journal of Threatened Taxa. 7 (5): 7168–7174. doi:10.11609/JoTT.o4035.7168-74. This article incorporates text by A.P. Singh available under the CC BY 4.0 license.