Occurrence of Elymnias obnubila Marshall
and de Nicéville, 1883 (Lepidoptera: Nymphalidae: Satyrinae) in
southern Mizoram: Range extension of the species and an addition to the Indian
butterfly fauna
Krushnamegh Kunte
FAS Center for Systems Biology, Harvard University, 52 Oxford
St, Northwest Lab Room 454.40-2, Cambridge, MA 02138, USA.
Email: KKunte@cgr.harvard.edu
Date of publication
(online): 26 November 2009
Date of publication (print): 26
November 2009
ISSN 0974-7907 (online) |
0974-7893 (print)
Editor: Maan Barua
Manuscript details:
Ms # o2279
Received 02 August 2009
Final received 14 September 2009
Finally accepted 29 October 2009
Citation: Kunte, K. (2009). Occurrence of Elymnias obnubila Marshall and de Nicéville,
1883 (Lepidoptera: Nymphalidae: Satyrinae)
in southern Mizoram: Range extension of the species and an addition to the
Indian butterfly fauna. Journal of Threatened Taxa1(11): 567-568.
Copyright: © Krushnamegh Kunte 2009. Creative Commons
Attribution 3.0 Unported License. JoTTallows unrestricted use of this article in any medium for non-profit purposes,
reproduction and distribution by providing adequate credit to the authors and
the source of publication.
Acknowledgments:I thank Mr. L.R. Thanga (IFS, Chief
Wildlife Warden, Mizoram Forest Department) for
logistic support during the field trip, which was funded in part by the
American Philosophical Society’s Lewis and Clark Fund for Exploration and Field
Research.
The Oriental
genus Elymnias Hübner1818, with about four dozen species, ranges from Sri Lanka and the Western Ghats
in India to southern China in the north and to Papua New Guinea and Australia
in the south, peaking in species diversity in the Malayan Archipelago (Marshall
& de Nicéville 1883; Talbot 1947; Corbet et al. 1992). India has nine species of Elymnias (Evans
1932; Talbot 1947), to which this report adds Elymnias obnubila Marshall & de Nicéville,
1883, popularly known as the Chestnut Palmfly.
Sighting of E. obnubila in Ngengpui WLS: Ngengpui Wildlife Sanctuary is situated about 40km southwest of the town of Lawngtlai in southern Mizoram in northeastern India. It
covers an area of 110km2, which is low-lying (170-550m) but hilly and receives
an annual precipitation of 2,500mm. It
is covered with subtropical evergreen and semi-evergreen forests, most of which
remain undisturbed by any large-scale human activities. The outskirts of the
sanctuary are either completely denuded or have been converted to teak
plantations, jhum (shifting) cultivation and
post-jhum bamboo growth (further details in Pawar & Birand 2001). The sanctuary thus forms one of the last
refuges for evergreen forest species in the area, where I surveyed butterflies
from 26 to 28 April 2008.
On 26 April, I
spotted an Elymnias perched on a
sapling, ca 1m off the ground, next to an elephant path in dense evergreen
forest. This forest was on a ridge near the PawizawhForest Hut (22025’50”N & 92047’29”E) within the NgengpuiWildlife Sanctuary, at an altitude of 300 to 400m. After taking a few photographs, I captured
the specimen to inspect it closely. It
exactly matched the original species description of E. obnubila (Marshall & de Nicéville 1883) and
photographs illustrated in several butterfly faunas (d’Abrera1985; Pinratana 1988; Inayoshi2008). The chestnut wing margins
particularly proved the identity of the species, and the relatively undamaged
wings and the hind-wing brand and hair tufts that are clearly visible in
photographs (Images 1 & 2) also indicated that the individual was a
somewhat fresh male. Since the species
identity was clear and I did not have permits to collect butterflies from the
sanctuary, I released the specimen on the spot after taking the photographs.
On the
underside of the wings, E. obnubila somewhat
resembles the widely distributed E. hypermnestraLinnaeus, 1763, but is easily separated from all other species of Elymnias by coloration on the upper side of
the wings, which are dark velvet-brown, broadly bordered with a rich, light
chestnut colour (Marshall & de Nicéville 1883). Males have a prominent brand on the upper side of the hind wing, which
is covered by a tuft of hair composed of two pencils (Evans 1932). Females lack this brand, are paler on the
upper side with much broader chestnut wing margins and a few obscure marginal
spots on the hind wing, but have otherwise similar markings and coloration
(Marshall & de Nicéville 1883; Evans 1932; d’Abrera 1985; Pinratana 1988).
Significance of this sighting: Marshall and de Nicéville(1883) described E. obnubila from only two
specimens, a male and a female, giving the habitat as “Upper Tenasserim; Mergui”, in southern
Myanmar (although only “Marshall, n. sp.” appears on the species description on
pp. 272-273). Dohertyi later collected it from “the
Karen Hills at about 2000 feet in April” and “west of Bassein”
from southern Myanmar (Elwes 1891). The species has subsequently been reported
from Ranong and Phuket,
across the border in Peninsular Thailand, although the known distributional
range of this species is still very restricted in southern Myanmar and Thailand
(Pinratana 1988; Inayoshi2008).
The relatively
fresh specimen reported here is most likely to have enclosed in the area. Elymnias are
generally weak on the wing and do not fly very far, so it is also implausible
that my specimen had traveled to southern Mizoram from its previously known
range. These two factors suggest that
there is a native population of E. obnubila in
southern Mizoram. Since the species was
previously known only from a small geographic area in southern Myanmar and
Thailand, my sighting represents a major range extension of this species by
1,500 to 2,000 km, across several major mountain ranges. Nevertheless, this range extension is not
surprising. In spite of previous
collecting efforts by a handful of British entomologists, the butterfly fauna
of this part of the Oriental Region remains poorly documented. Besides, Elymnias tend to be crepuscular and most species occur in dense evergreen
forests. Hence, they are difficult to
find and are easily overlooked due to the cryptic patterns on their
undersides. Specifically, E. obnubila is known only from a few specimens, and the
species was considered rare by all previous authors. Presumably, the species occurs at very low
density and perhaps in small pockets throughout its range. Moreover, the paucity of recent work on
butterflies throughout most of Myanmar and northeastern India has not helped
faunal discoveries in this region. It
is, thus, not surprising that this species has gone unnoticed in northeastern
India for 125 years since its description.
Recently,
range extensions of other organisms that were previously known to occur only as
far north as southern Myanmar, have been reported from NgengpuiWildlife Sanctuary; a prominent example is of Ptychozoon lionotum the Smooth-backed Parachute Gecko (Pawar & Biswas 2001). The range extension of E. obnubila indicates that more southern Myanmarese species may be found in NgengpuiWildlife Sanctuary and other forested regions in Mizoram and adjacent
northeastern Indian states.
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