Conservation status of the
only Lungless Frog Barbourula
kalimantanensis Iskandar,
1978 (Amphibia: Anura: Bombinatoridae)
Biofagri A.
Rachmayuningtyas 1, David P. Bickford 2, Mistar Kamsi3, Sujatha N. Kutty 4, Rudolf Meier 5,Umilaela Arifin 6, Angga Rachmansah 7 & Djoko T.
Iskandar 8
1,6,7,8 School of
Life Sciences and Technology Institut Teknologi Bandung 10 Jalan Ganesa,
Bandung 40132, Indonesia.
2,4,5 Raffles
Museum for Biodiversity Research, Department of Biological Sciences, National
University of Singapore. 14 Science Drive 4, Singapore 117543
3 Sumatran
Orangutan Conservation Program, 51/74 Jl. KH Wahid Hasyim Medan, 20154,
Indonesia
7 Present
address: Fauna & Flora International, Indonesia Program, Ketapang,
Kalimantan Barat, Indonesia.
Email: 1 biofagri@yahoo.com, 2dbsbdp@nus.edu.sg, 3 mistar234@gmail.com, 4 sujatha@nus.edu.sg,5 dbsmr@nus.edu.sg,
6 umilaela@gmail.com,7 angga.rachmansah@gmail.com, 8 iskandar@sith.itb.ac.id
(corresponding author)
Date of
publication (online): 26 August 2011
Date of
publication (print): 26 August 2011
ISSN
0974-7907 (online) | 0974-7893 (print)
Editor: Mirco Solé
Manuscript details:
Ms # o2560
Received 07 September 2010
Final received 26 July 2011
Finally accepted 04 August 2011
Citation:Rachmayuningtyas, B.A., D.P. Bickford, M. Kamsi, S.N. Kutty, R. Meier, U.
Arifin, A. Rachmansah & D.T. Iskandar (2011). Conservation status of the
only Lungless Frog Barbourula
kalimantanensis Iskandar, 1978 (Amphibia: Anura:
Bombinatoridae). Journal
of Threatened Taxa 3(8): xxxx–xxxx.
Copyright: © Biofagri
A. Rachmayuningtyas, David P. Bickford, Mistar Kamsi, Sujatha N. Kutty, Rudolf
Meier, Umilaela Arifin, Angga Rachmansah & Djoko T. Iskandar 2011. Creative
Commons Attribution 3.0 Unported License. JoTT allows 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.
Authors Details: Biofagri A. Rachmayuningtyas and Umilaela
Arifin are both graduate students in Biology. Both are working on the
taxonomy, ecology and conservation. David P. Bickford is an Assistant Professor at National
University of Singapore. His research is focused on reptiles and amphibians,
their ecology and evolution, understanding adaptive radiations, and
biogeography. Mistar Kamsi is a freelance researcher
in biology and conservation. He is mainly interested in amphibians and reptiles
biology. Rudolf Meier, Associate Professor at National University of
Singapore and his assistant Sujatha N. Kuttyfocused on molecular genetics, phylogenetic relationships, mainly on
insects. Angga Rachmansah is a graduate student in biology and
engaged as a part timer surveyor at Fauna & Flora International- Indonesia
program, working on the ecology and conservation of amphibians and
reptiles. Djoko T. Iskandar is the team leader and working as full
Professor in Ecology and Biosystematics at School of Life Sciences and
Technology, Institut Teknologi Bandung, working extensively on the herpetofauna
of Southeast Asia and Australo-Papua.
Author Contributions: BAR and UA
are responsible for data gathering in the field, data analysis, preparing
figures and writing. DPB is involved in the first expedition and also
responsible for the third expedition, arrange for funding, analysis,
photographing and writing. He is mainly responsible in the paper writing,
restructuring and very active in discussion about the content of this work. MK
is responsible for the second expedition, mainly involved in finding specimens
during the first and second expeditions, photographing and writing. RM and SNK are responsible in the
genetic analysis and writing. AR
is responsible in acquiring more data on Barbourula kalimantanensis since the
first expedition up to present. DTI is the leader for the first expedition, arrange for logistics,
permits and writing and preparing figures.a
Acknowledgments: Fieldwork for
this research was funded by the National University of Singapore under DPB’s
startup R-154-000-383-133 and the cryptic species project R-154-000-270-112 and
Mohammed bin Zayed species conservation fund. We acknowledge the help of Drs.
E. Effendy (former) and Widada, Heads of the Bukit Baka-Bukit Raya National
Park who accorded us to work and collect samples. We also appreciate Mr. D.
Liswanto (Titian Foundation, FFI), who coordinates logistics for the field
trips in 2008 and 2011. Our sincere thanks are addressed to S. Howards and Dr.
H.H. Tan from National University of Singapore, and the other students and
colleagues, K. Indraswari, G. Ramadhan, L.R. Aditya, N. Firdaus, (ITB) and H.N.
Tokan, Mediyansyah, H. Hasymi, D. Aryadi, D. Aryadi, B. Susilo (UNTAN), who
helped us in the field.
Abstract:In response to the recent rediscovery of Barbourula
kalimantanensis, which is currently the only known
lungless frog, a number of biologically important aspects of the species were
examined and its taxonomy and conservation status was reviewed. Based on the species’ ecological
requirements, habitat restrictions and recent severe habitat loss, we propose
to change the conservation status of Endangered B2ab(iii) to Vulnerable
B1ab(iii) and earmark the species as a conservation flagship for the region and
for Indonesia.
Keywords:Archeobatrachia, Borneo, distribution, flatheaded frog, Indonesia, national
park, protection status.
For figures, images, tables -- click
here
INTRODUCTION
Barbourula kalimantanensis Iskandar,
1978, is a frog with peculiar morphological adaptations (extreme flattening of
the body, no lungs, and full webbing of the fingers) that lives in pristine,
clear, fast, and cold-running streams and is of great conservation interest
because of severe recent habitat loss. It is the only member of the bombinatorid frog family in Indonesia and
only found in Kalimantan, whereas the other members of the family, except Barbourula busuangensis Taylor & Noble,
1924 (found in the Philippines), have a completely Palaearctic distribution
(Iskandar 1978). Before the recent
rediscovery, surveys of suitable habitat had not recovered any further
populations, suggesting that this species has a very limited distribution
and/or is very rare (IUCN 2006). Additionally, it may be facing extirpation or extinction as forest
stream habitats upon which it is dependent are being heavily modified due to
illegal gold mining and deforestation (IUCN 2006). Based on our previously limited data, the International
Union for Conservation of Nature (IUCN) categorized B. kalimantanensis as Endangered, applying
criteria B2ab(iii); i.e., extent of occurrence (EOO) of less than 5000km2; all
individuals in less than five locations and its forest habitat in Kalimantan is
still in decline.
In order to conserve a species, accurate
population, reproduction, ecology, and range information about the species are
required to provide better assessment of conservation status and develop a
feasible management plan. As
information about B. kalimantanensis was previously
incomplete, additional data were badly needed. Therefore, several expeditions were organized to confirm the
species’ geographic range in the wild (5–21 August 2007, 30 June–9
July 2008, 7–15 July 2009 and 25 March–14 April 2011). The expeditions studied the area around
Bukit Baka Bukit Raya-National Park (BBBR-NP), around the border of West and
Central Kalimantan Province (00035.228’–47.575’S & 112014.195’–19.241’E). We obtained nine specimens of B. kalimantanensis in 2007, two in 2008
and three others in 2009. Recently, a single specimen has been obtained on 10 April 2011, again
from a production forest, northwest of the previously known distribution (Image
1). We discovered that this
species is the first lungless frog (Bickford et al. 2008). This adaptation will have major
consequences for the ecology and distribution of the species but we still know
very little about the species’ ecology. In addition, we also obtained information about habitat and genetics.
With this additional information, the extinction risks of this species can be
better understood and mitigated. This paper summarizes this information and reviews the conservation
status of B. kalimantanensis,
making suggestions for a management strategy.
METHODS
Field surveys
We used VES, a method in which a team of
five field personnel walked through the habitat of the frog (fast flowing
streams > 4m wide) from 1900 to midnight, to search for B. kalimantanensis (Heyer et al.
1994). We investigated eight
streams at a lower elevation (200–400) within the primary rain forest
around BBBR-NP (Fig. 1). Six
streams (Seti, Bahae, Baras Bahae, Kelawai, Sahaur, and Sepilang of Katingan
River, part of Mendawai River Basin) were in the Kalimantan Tengah Province,
while the other two streams (Ela Hulu and Semunga, part of Melawi River Basin)
were in the Kalimantan Barat Province. The streams’ physico-chemical characteristics (DO, pH, salinity, water
temperature, and current speed) were assessed with a YSI 556 Multi-Probe
system. The stream substrate was
also sampled from three spots along each stream and sorted using a Tyler
Standard Screen Scale. The substrate
size compositions were then analyzed by cluster analysis and one way ANOVA.
Genetic Analysis
DNA Sequences:
We used the DNeasy kit (QIAGEN), following the manufacturer’s protocol, to
isolate DNA from tissue samples for eight specimens of B. kalimantanesis. Two gene fragments were amplified,
approximately 500bp of cyt b and 450bp of COI. We used the universal
HCO2198 (5’- TAAACTTCAGGGTGACCAAAAAATCA -3’) –LCO1490 primers (5’-
GGTCAACAAATCATAAAGATATTGG -3’) to
amplify COI (Folmer et al. 1994), and two alternative pairs
of primers for cyt b (because of primer binding problems for some
individuals)(see Sheridan et al. 2010). We used the same PCR protocol as Folmer et al. (1994)
and Sheridan et al. (2010) for the two COI and cyt b protocols, purified the PCR products with SureClean, cycle
sequenced using BigDye Terminator v3.1, and cleaned again with Agencourt’s
CleanSEQ before being sequenced on an ABI 3130xl Genetic Analyzer. All sequences were aligned based on
amino acid translations as described in Meier et al. (2006). In order to carry out a preliminary
comparison of the intraspecific genetic variability of B. kalimantanesis with other archeobatrachian frogs, we used GenBank
sequences for cyt b to quantify the intraspecific variability using uncorrected
pairwise distances as
determined in PAUP* (Swofford 2002). A similar comparison for COI was not carried out due
to the lack of GenBank data for assessing the intraspecific variability across
Archeobatrachia.
RESULTS
Rediscovery of the species with new
additional specimens
We obtained nine specimens of B. kalimantanensis from two of eight
streams sampled. One specimen was
obtained from Ela Hulu stream in Melawi River Basin, West Kalimantan, and eight
specimens from Bahae Stream; plus one, not collected specimen from Sahaur
stream in Mendawai River Basin, Central Kalimantan in 2007 (Fig. 1). We also obtained two additional specimens
from Bahae Stream in 2008 and three others in 2009 from the same site. From a recent independent survey, a
single specimen has been obtained from Melopang Stream (00035.228’N
& 112014.195’E), Sokan River, another part of the Melawi Basin,
West Kalimantan, bringing the total to 17 known specimens. Physico-chemical measurements of
streams around BBBRNP where B. kalimantanensis were found revealed
that the water is below 230C, usually 14–17 0C,
with current speeds reaching 5m/s. The DO averages 8.6mg/l (100.5%).
Results of cluster analysis of stream
substrate showed that stream compositions varied between one another, however
three clusters could be established (Fig. 2). Even though each cluster differed from the others
significantly (p < 0.05), most clusters comprised of samples from different
streams. Only one spot in the
Baras Bahae Stream formed a separate cluster, caused by a large proportion of
fine particles (> 40% are less than 0.25mm). Other streams, including Baras Bahae spot 1 and 3, are clustered
together, either with Ela Hulu or with Bahae, indicating that they have a
similar composition of substrate.
It is important to consider that the
actual amount of suitable habitat within the range is small because it only
consists of clear, fast, cold, and wide streams. The last discovery of the species from a small stream with
lots of cascades and slab rock bottom indicates that the species is potentially
capable of staying in damp cool areas on land and might explore wider habitats
other than streams, thus facilitating the ability to move from one to another
place on land.
Genetic Variations
The eight cyt b sequences belong to four
haplotypes with one population being monomorphic (3 sequences) and sharing its
haplotype with the second population (for GenBank accession numbers see supporting information). All haplotypes are very similar
(uncorrected pairwise distances: 0.09–0.35 %; median distance:
0.09%). Preliminary comparison of
intraspecific genetic variability of Barbourula kalimantanesis with other
archeobatrachian frogs using GenBank sequences for cyt b showed that the
genetic variability of B. kalimantanesis is very low (n=8; mean
0.09%; range 0–0.35 %) (Table 1).
DISCUSSION
The Occurrence of Barbourula kalimantanensis
Barbourula kalimantanensis was
previously recorded from only three localities, Pinoh (Iskandar 1978) and
Kelawit River (Iskandar 1995) in the Melawi River Basin, West Kalimantan, and
Tengkalap River (Santoso et al. 2006) in the Belantikan River Basin, Central
Kalimantan. From expeditions to BBBR-NP and neighboring areas, nine additional
specimens of B. kalimantanensis were obtained from three
new localities, Ela Hulu and Melopang Stream, Sokan River, West Kalimantan; in
the Melawi River Basin, West Kalimantan; Bahae Stream in the Mendawai River
Basin, Central Kalimantan i.e., the species is now known from seven localities
representing an EOO of more than 5,000km2.
As the area around the type locality is
now highly degraded due to illegal gold mining (IUCN 2006), much of the habitat
is no longer suitable for B.
kalimantanensis, and populations of this species in this
area are assumed to be extirpated (Iskandar, unpub. data). As a result, two of the known sites are
now lost, but we have at least three additional sites, which expand the EOO to
above 5,000km2. Stream
connectivity suggests that the EOO of this species could be much larger than
5,000km2. There are
practically no geographic barriers between Ela Hulu and Bahae streams, though
they are in different river basins on the same side of a small ridge. The area is relatively flat, and the
headwaters adjacent to Ela Hulu (about 5km away) are interconnected with Bahae,
making the distance between them and the Melawi Basin drainage only about 8km
on the same gentle slope. The
Melopang Stream, Melawi River Basin, extends far to the west and is very close
to Pawan River Basin which flows to the west coast of West Kalimantan. It is only separated by about 5km from
the head water of Pawan River and can be located visually from the neighboring
hilly area.
Compared to other archaeobatrachian frogs,
the genetic variability of B. kalimantanesis is
extremely low (Table 1). This
probably indicates that the streams are historically well connected, with
little isolation between populations of B. kalimantanensis in Melawi Basin and
those in Mendawai Basin. As
streams’ connectivity occurs, not only between the head waters of Melawi and
Mendawai Basin to the south, Melawi-Pawan to the west, but also between head
waters such as Mendawai-Seruyan, Mendawai-Sampit, Seruyan-Belantikan,
Mendawai-Dayak Besar, and also perhaps Dayak Besar-Dayak Kecil. Judging from the topography most of the
aforementioned streams have their headwaters on the same gentle slope of the
Schwanner mountain range facing south. For that reason, the extent of occurrence of B. kalimantanensis could thus be much larger
than previously thought. It might
encompass all headwaters, from the foot of the Schwanner mountain range,
through the Belantikan basin up to Dayak Kecil basin (Image 2). Although suitable habitat is
undoubtedly patchy all along these rivers, EOO is still potentially much
greater than had previously been revealed from the limited number of specimens
prior to 2007 as shown in the present discoveries.
Habitat Associations and Preference
Barbourula kalimantanensis is
a fully aquatic frog (Iskandar 1978) whose presence has always been associated
with relatively shallow (< 1m), cold, fast-flowing, clear, rocky streams in
primary tropical rain forest (Iskandar 1978, 1995; Santoso et al. 2006). In fact, they seem to be inseparable,
as B. kalimantanensismorphology shows extreme specialization for aquatic life in that specific
habitat (Iskandar 1978; Bickford et al. 2008) which in turn reduces its ability
to live elsewhere (Frazer 1973). As a lungless species, B. kalimantanensis needs higher levels of
free oxygen that is only provided by shallow, clear, cold, fast flowing, and
highly mixed streams. Physico-chemical measurements of streams clearly showed that the water
is well aerated and oversaturated. In addition, none of the 14 specimens were caught among stones with dead
leaves or other kinds of debris, probably avoiding water with less oxygen
content caused by decomposing materials.
Bare rock and large stones are the major
substrate of Barbourula kalimantanensis stream habitat and play
an important role in the way this species lives. Large stones (> 30cm in diameter) are used as cover;
hiding under bigger rocks and/or camouflaging directly on the stream
substrate. The streams’ substrates
also serve as home for benthic fauna which B. kalimantanensis preys upon. One individual of B. kalimantanensis (RMBR 1007, SVL 49mm)
had the stomach filled with a large, barely digested aquatic dytiscid larva of
30x7 mm (LxW), with its abdomen crumpled and a single, undigested trichopteran
larva. The recent captured specimen
of 60mm readily accepts small shrimp (Macrobrachium sp.) when kept in running water within a
mesh cage. Considering its
generally lethargic behavior, it is assumed that this species is a sit-and-wait
predator of benthic fauna that pass by instead of actively looking for food.
From eight investigated streams, B. kalimantanensis were found only in Ela
Hulu, Sahaur and Bahae streams. However, all streams were found to have similar substrate size and
composition via cluster analysis of stream substrate samples. Other streams,
except for Baras Bahae spot 2, were also clustered together, either with Ela
Hulu or with Bahae, indicating that they shared the same composition of
substrate, and could be the type of habitat suitable for B. kalimantanensis (Fig 2). The last discovery from a small, fast
flowing stream with slate bedrock bottom and small cascades might indicate that
the species can thrive on humid terrestrial habitat, analogous to many lungless
salamanders of the North American forest (Welsh & Droege 2001; Dillard et
al. 2008).
Threats
For the time being, IUCN considers two
major threat types for B. kalimantanensis, habitat loss and pollution mainly due to
deforestation (logging) and gold mining. In logged areas, rocks in streams become coated with a thin layer of
silt, and the food supply of benthic organisms is destroyed (Inger &
Stuebing 1995). Barbourula kalimantanensis, in addition to feeding
on small shrimp species, is now known to feed on larva of Trichoptera and
Dytiscidae, all are benthic organisms and the insect larvae are known to feed
on algae (McDonald et al. 1990). Thus, the silting of streams caused by logging and illegal gold mining
would affect the benthic populations of prey species negatively. In a logged area, water temperature is
found to be warmer than in the non-logged area (Graynoth 1979; De Groot et al. 2007). The effect of temperature increase for B. kalimantanensis is clear. It causes oxygen concentrations to
decrease as a consequence of lower solubility (Hill et al. 2008). This condition could seriously harm not
only B. kalimantanensis,
but other aquatic organisms as well. Similar to logged areas, gold mining activities also cause adverse
habitat modifications for B.
kalimantanensis. The headwaters of most streams in the region are intersected by logging
roads and the future of these streams is in jeopardy. In addition to logging and heavy silting of roads, gold
mining also contributes to the pollution of streams with highly toxic mercury.
Several other risk categories such as
global warming, habitat specificity because of lunglessness, and very low
genetic variability should be added to the list of extinction threats for this
species. The influence of global
warming upon B. kalimantanensismay not be recognized as yet, but it has been confirmed to affect amphibian
populations and is the most likely candidate for causing extinction of Bufo periglenes (Stuart et al. 2004,
2008; Flannery 2005). Threat from Batrachochytrium dendrobatidiscould be set aside as the area where B. kalimantanensis is known to occur is
still remote from excessive human activities and not yet influenced by
introduced plant and animal species. Lunglessness is a highly specialized
adaptation for living in a specific habitat, effectively preventing the species
from living elsewhere. As habitat
degradation on Borneo is very extensive, lunglessness could become a major
liability for this species. Any
kind of change that alters water quality, especially oxygen content, would
seriously affect this frog. The
only recourse for survival is to retreat upstream. The very low genetic variability of this species also
indicates the possibility of a recent bottleneck effect, though confirmation of
such an event is still needed.
A review to Barbourula kalimantanensis’
IUCN conservation status
Based on two specimens, IUCN (2006)
categorized Barbourula kalimantanensis as
Endangered B2ab(iii). This
category was given in consideration of its area of occupancy (AOO), previously
thought to be less than 500km2, or an EOO of less than 5,000km2. Now, as discussed above, we believe its
present range area is more than 5,000km2. As a consequence, its EOO in category B for Endangered
species designation is no longer appropriate. Lunglessness has made B. kalimantanensis very susceptible to
changes in water quality, especially oxygen content. Possible responses of B. kalimantanensis are to retreat
upstream. As all specimens of B. kalimantanensis were discovered
upstream near the stream headwaters and not lower down stream, Habitat
degradation in those areas will be catastrophic. In the meantime, all of the
interconnected streams and many of the headwaters shown in figure 1 are in the
area of logging concession (Singleton et al. 2004). Within this area, the
threat from logging is severe. Moreover, logged areas are prime targets for
indigenous and newly arrived slash and burn agriculturists, further
deteriorating water quality of the stream habitats. In addition, there is evidence that illegal mining is
continuing up the watercourses around the area (Jarvie et al. 1998; present
study). Based on this information,
populations of B. kalimantanensisare exposed to tremendous threats of extirpation and extinction. Logging should be managed carefully,
and if agriculture and gold mining continue, it will exacerbate extinction
risks of all the known and presumed populations of B. kalimantanensis. Despite the threats from habitat
degradation, and the low adaptability of B. kalimantanensis (lungless and low
genetic variability), we recommend that this species be listed as a Vulnerable
B1ab(iii), as more and more localities are discovered in the last decades and
covering major watersheds in west and central Kalimantan. Some clean small streams with slab rock bottom, crevices and cascades
are found to be the home of B.
kalimantanensis as well.
Conservation Efforts
In Indonesia, no amphibian species is on
the list of plants and animals protected by law (Dephut 2004). This condition is driven by lack of
data supporting the importance of amphibian species as a component of
ecosystems (Iskandar 2004), and by a lack of scientific monitoring
efforts. Available data about B. kalimantanensis from this study might
still be inadequate, but its unique adaptation and extreme specialization
should be sufficient to garner attention from the Indonesian government. Besides, by following criteria of
protected species from Indonesian Governmental Law no.7. 1999 (Noerdjito et al.
2005), B. kalimantanensishas already met at least two important criteria. The first criterion is living in a very specific and
restricted habitat, and the second is low adaptability or ability to live
elsewhere. Thus, we strongly
suggest that the Indonesian government give more attention to this species, and
put it on the list of protected species of Indonesia. In addition, protecting B. kalimantanensis means protecting the
head waters and surrounding forest habitats, which for the time being, are
subject to logging, fragmentation, other conversion threats (Singleton et al.
2004), and illegal gold mining activities (Lestariya 2005). Conserving B. kalimantanensis will thus also protect
headwaters and affect forest quality.
At present, no additional specimens have
been found inside Bukit Baka Bukit Raya National Park. However, as the rivers that feed into
the Melawi and Katingan (Mendawai) rivers have some of their headwaters in the
park, it is very likely that BBBR-NP is the most likely place for a B. kalimantanensis sanctuary. The remoteness of the park and other
known sites is one advantage, although it nevertheless faces many threats
(Jarvie et al. 1998). Thus, the
park, along with government and local people, should work together to maximize
conservation of this species. Even
though populations of B. kalimantanensis are exposed to
tremendous threats of extirpation and extinction, there is still a good chance
for this species to remain extant and sustain healthy populations in
well-managed protected areas.
We propose that Barbourula kalimantanensis should become a flagship
species for the park. Its
endemicity, unique appearance, and lunglessness (as a special adaptation) will,
without doubt, attract international attention and support. When public and scientific support has
been generated, funding can be directed to maintain ecological processes and
ecosystem integrity in streams and surrounding forest habitats, protecting not
only this species, but also the remaining species in this area.
Supporting
Information:
Material
examined: MZB Amph. 2335 (holotype), adult male from Sungai Pinoh, south of
Nanga Pinoh, by S. Wirjoatmodjo & T. Roberts, July 1977. ZRC 1.3219 1 ex, adult female from
Sungai Kelawai, 1 km upstream of Nanga Pintas (0036’44”S & 111047’22”E)
by M. Kottelat, 17.ix.1993; ITB coll (RMBR 989, 1003, 1004) 4 ex. (1 juv.
female, 2 juv. males). ZRC coll. (RMBR 934, 939, 1005, 1006), 4 ex., (3 juv.
females, 1 juv. male) from Bahae Stream, by D.T. Iskandar & coll., 15–21.viii.2007. ITB coll. (RMBR 1007) 1 ex (juv.
female). preserved in ethanol 70%; ITB coll. RMBR 1117 from Ela Hulu Stream,
D.T. Iskandar & coll., 15–21.viii.2007; ITB coll. MK 721, 722 (1
adult male and 1 juv.) from Bahae Stream, by M. Kamsi. June 2008. ITB coll. (FN
RMBR 2060-2062; 3 ex, juv.) from from Bahae Stream, by D.P. Bickford &
coll., July 2009. 10.iv.2011, AR 456 (1 ex.), from Melopang Stream, Sokan
River, a part of the Melawi watershed, West Kalimantan, by A. Rachmansah.
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