Barilius profundus, a new
cyprinid fish (Teleostei: Cyprinidae)
from the Koladyne basin, India
M. Dishma1 & W.
Vishwanath2
1,2Department of Life Sciences, Manipur University, Canchipur, Manipur 795003, India
Email:1 dishma27@gmail.com, 2 wvnath@gmail.com (corresponding author)
Date
of publication (online): 26 February 2012
Date
of publication (print): 26 February 2012
ISSN
0974-7907 (online) | 0974-7893 (print)
Editor: K. Rema Devi
Manuscript
details:
Ms # o2838
Received 15 June
2011
Final received 05
January 2012
Finally accepted 30
January 2012
Citation: M. Dishma & W. Vishwanath (2012). Barilius profundus, a new cyprinid fish (Teleostei:Cyprinidae) from the Koladynebasin, India. Journal of Threatened Taxa 4(2): 2363–2369.
Copyright: © M. Dishma & W. Vishwanath 2012. Creative Commons Attribution 3.0 Unported License. JoTT allows
unrestricted use of this article in any medium for non-profit purposes,
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Author
Details: M. Dishma is
a junior research fellow under a project funded by the Department of Science
& Technology, New Delhi. He is working on the inventory of the bariline and cobitid fishes of
northeastern India. He is undergoing PhD on a relevant topic in the Department
of Life Sciences, Manipur University. Dr. W.Vishwanath is a Professor in the Department of
Life Sciences, Manipur University. His field of specialization is fish and
fisheries. He is presently engaged in taxonomy and systematicsof freshwater fishes of northeastern India.
Author
Contribution: The study: MD survey, collection, morphometric and anatomic study of barilinefishes of northeastern India and their phylogenetics;
WV supervision of taxonomy and phylogeny of freshwater fishes of northeastern
India. Current paper: MD detailed
examination of the bariline fishes of the Koladyne and its
tributaries in Mizoram and comparison with specimens in ZSI, Kolkata and in MUMF. WV supervision in establishing new
species and discuss taxonomic status.
Acknowledgements:The authors are grateful to the
Department of Science & Technology, New Delhi (Project No.
SR/SO/AS-50/2008) for financial support.
Abstract: Barilius profundus,
a new species of bariline cyprinid fish is described
from the Koladyne River, Mizoram, India. It is distinguished from congeners in
having the following combination of characters: great body depth at dorsal-fin
origin (32.0–-37.3 % SL), 17–18 pre-dorsal scales, 7–10 dark
blue bars on the sides of the body, 30–32 + 2–3 lateral line
scales, ½7/1/2½ lateral transverse scales and 12 circumpeduncular scales. Key to species of Barilius of northeastern India is provided.
Keywords: Bariline fish, Mizoram, new species.
For
figures, images, tables -- click here
Introduction
Fishes of the genus Barilius Hamilton are characterised by a
compressed body, blue-black bars or spots on the body and dorsal fin inserted
behind the middle of the body (Hamilton 1822). The members of this genus are inhabitants of medium to fast
flowing torrential mountain streams of China, western Asia, South and mainland
South-east Asia. Thirteen species
of the genus are hitherto known from the Eastern Himalaya region (Vishwanath et al. 2010). They are: B. ngawa Vishwanath & Manojkumar, B. dogarsinghi Hora, B. chatricensis Selim & Vishwanath, B. lairokensis Arunkumar & Tombifrom the Chindwin drainage; B. barila (Hamilton), B. bendelisis (Hamilton), B. tileo (Hamilton), B. shacra (Hamilton), B. vagra (Hamilton), B. barna (Hamilton), B. dimorphicus Tilak& Husain, B. radiolatus Gunther,
and B. bonarensis Chaudhurifrom the Ganga-Brahmaputra drainage. The KoladyneRiver in Mizoram, northeastern India, is a drainage connected neither with the Ganga-Brahmaputra nor the Chindwin drainages. Its icthyofaunais poorly explored. Collections
from the river (also known as Kaladan or Chhimtuipui) include an undescribedspecies of Barilius which is herein described as a new species.
Materials
and Methods
Measurements were made point to point on the left side of
specimens wherever possible with dial calipers to the nearest 0.1mm. The colour in
fresh specimens was noted before fixation and preservation in 10%
formalin. Counts and measurements
follow Kottelat (1990) and lateral line scale count, Kottelat (2001). Head length (HL) and anatomical measurements are expressed as
proportions of standard length (SL) and subunits of head as proportions of head
length (HL). Osteologicalstructures were observed in a cleared and alizarin-stained specimen following Hollister (1934). Vertebral counts followWeitzman
(1962). Fin rays were counted under a stereo-zoom light microscope. Type specimens are deposited in the Manipur University
Museum of Fishes (MUMF).
Barilius profundus sp. nov.
(Image 1)
Type material
Holotype: 24.xii.2009, 22023’N
& 92057’E, 71.1mm SL; Koladyne River
at Kolchaw, LawntlaiDistrict, Mizoram, India, coll. Nebeshwar and party,
MUMF 27001.
Paratypes: 4 exs.,
55.2–67.7 mm SL, data as for holotype, MUMF
27002-27005; 8 exs., 30.xi.2008, 50.9–69.9 mm
SL; Koladyne River at Kolchaw,Lawntlai District, Mizoram, India, coll. Nebeshwar & party, MUMF 27021-27028. One paratype(MUMF 27005, 54.5mm SL) dissected for osteology.
Diagnosis
A species of Barilius with the following combination of characters: great body depth at dorsal-fin origin (32.0–37.3 % SL); 17–18 pre-dorsal scales; 7–10 dark blue bars against faintly brown to yellowish-cream
background of body, width of bar narrower than interspacewidth; lateral line complete with 30–32 + 2–3 scales; eye diameter (38.3–42.9 % HL), predorsal length (58.9–64.0 % SL); dorsal-fin
length (21.6–25.7 % SL); ½7/1/2½
lateral transverse scales; 12 circumpeduncularscales; and 35 vertebrae.
Description
Morphometric data are shown in Table 1 and Appendix 1. Body compressed, abdomen rounded. Dorsal profile in front of dorsal-fin
origin relatively straight, gently sloping downward towards base of caudal
peduncle. Ventral profile slightly
curved till pectoral-fin origin, then straight up to anal-fin origin, thereafter
sloping dorsally to end of caudal peduncle. Muscular pads present at base of pectoral and pelvic fins.
Head moderately compressed; shorter than
wide. Snout blunt, profile
dorsally curved and rounded when viewed laterally, length shorter than interorbital distance. Eyes large, slightly bulging (convex), visible both from
dorsal and ventral sides of head, situated in anterior half of head, diameter
smaller than interorbital distance. Interorbitalspace slightly arched. Mouth
terminal, obliquely directed upwards. Gape of mouth reaches anterior margin of orbit. Tubercles on snout and
lower jaw poorly developed.
Barbels two pairs, short. One pair each of rostral and maxillary. Lips thin. Nostrils almost at level of upper margin of eye, distinctly
nearer to anterior margin of eye than tip of snout. Jaws equal in length. Lower jaw without symphysialknob.
Dorsal fin inserted
posterior to pelvic-fin origin with ii, 7½ rays and closer to caudal-fin
base than tip of snout; longer than pelvic and anal fin; tip of last branched
ray extending to middle of anal fin base. Pectoral fin with i,11 rays, shorter
than head length; their tips pointed or nearly so; not reaching pelvic-fin
origin. Pelvic fin with i, 8 rays, its origin much nearer to anal-fin origin than
pectoral-fin origin, shorter than head length and pectoral fin; pelvic fin not
reaching anal opening. Anal-fin
origin just below base of last dorsal fin ray, with ii, 10½ rays; not
reaching caudal peduncle when adpressed; fin margin
concave. Anal fin shorter than
head length. Anal opening located
immediately anterior to anal-fin origin. Caudal fin deeply forked with i, 9+8, i principal rays, both upper and lower lobes equal in
length.
Scales moderate. Circumpeduncular scales 12, lateral transverse scale ½7/1/2½. Lateral line complete with
30–32 + 2–3 scales. Vertebrae 18+17= 35 including complex vertebra.
Colour: In a fresh specimen, dorsal and dorsolateralsurfaces of head and body faintly brown, ventral portion anterior to pelvic-fin
origin silver coloured. Belly creamy to golden yellowish and with 7–10 dark
blue bars on the sides; first anterior-most dark
blue bar extends beyond lateral line, sometimes first two or three
anterior-most bars touch lateral line. Dorsal fin hyaline with a row of elongated black marks. Pectoral, pelvic and anal fins golden
yellow with hyaline distal margins. Caudal fin edged with black, faintly yellowish-green at the base.
In 10% formalin, body
creamy, slightly dark dorsally. Dorsal fin hyaline with a row of elongated black marks. Caudal fin hyaline, edged with
black. Pectoral, anal and ventral
fins hyaline without dark bands.
Etymology
The species name ‘profundus’ (Latin, meaning deep) is in reference to its
great body depth, an adjective.
Distribution
Presently known only from
the Koladyne River at Mizoram (Fig. 1, Image 2).
Discussion
Barilius profundus sp. nov.
is close to its nearest congeners, B. dogarsinghi and B. barna in having a dorsal fin with 7½ branched rays and a pelvic
fin with eight branched rays. However, the new species differs from B. dogarsinghi in having greater body
depth at dorsal-fin origin (32.0–37.3% SL vs. 24.8–30.0), eye
diameter (38.3–42.9 % HL vs. 29.2–33), and branched anal-fin rays
(10½ vs. 9½); lesser pre-dorsal scales (17–18 vs. 20),
lateral line scales (30–32 + 2–3 vs. 37–40 + 2). It differs from B. barna in having greater body depth at dorsal-fin origin (32.0–37.3%
SL vs. 29.0–30.8); presence (vs. absence) of barbels;
longer predorsal distance (58.9–64.0% SL vs.
53.9–54.9), anal-fin distance (16.6–20.4% SL vs. 13.3–15.1);
shorter caudal peduncle (11.4–15.6% SL vs. 16.1–16.9); more predorsal scales (17–18 vs. 15–16); lesser
lateral line scales (30–32 + 2–3 vs. 36–39 + 2–3), and
branched pectoral-fin rays (11 vs. 12).
Barilius profundus sp. nov.
differs from B. barila, B. tileo, B. shacra and B. vagra in having greater body depth at dorsal-fin origin 32.0–37.3
% SL (vs. 23.4–24.0 in B. barila, 29.9 in B. tileo, 22.2–23.2 in B. shacra and 25.2–26.7 in B. vagra), 17–18 predorsal scales (vs. 22
in B. barlia, 28 in B. tileo, 22–25 in B. shacra and 21–22 in B. vagra) and 30–32 + 2–3 lateral line scales (vs. 40–42
+ 2–3 in B. barila, 59+4 in B. tileo, 59–70 in B. shacra and 40–42 + 3 in B. vagra). Barilius profundus sp. nov. further
differs from B. bendelisis in having greater body
depth at dorsal-fin origin (32.0–37.3% SL vs. 22.1–26.1), 30–32
+ 2–3 lateral line scales (vs. 39–42 + 2–4), scales without
dark spot (vs. with dark spot); from B. radiolatus in having greater body
depth at dorsal-fin origin (32.0–37.3% SL vs. 22.2), 30–32 + 2–3
lateral line scales (vs. 58), ventral fin not reaching vent (vs. reaching
vent); from B. bonarensis in having greater body
depth at dorsal-fin origin (32.0–37.3% SL vs. 21.7–22.2), 30–32+2–3
lateral line scales (vs. 47); from B. dimorphicus in having greater body
depth at dorsal-fin origin (32.0–37.3% SL vs. 24.9–28.8), 30–32
+ 2–3 lateral line scales (vs. 60–66), 17–18 predorsal scales (vs. 25–27). The new species differs from B. ngawa, B. chatricensis and B. lairokensis in having greater body depth at dorsal-fin origin (32.0–37.3
% SL vs. 24.8–28.3 in B. ngawa, 23.2 in B. chatricensis, 25.5 in B. lairokensis), 17-18 predorsal scales (vs. 21–22 in B. ngawa, 15 in B. chatricensis, 21 in B. lairokensis), 30–32 + 2–3 lateral line scales (40–41 + 2–3
in B. ngawa, 36+2 in B. chatricensis, 41+3 in B. lairokensis).
In case of Barilius radiolatus, B. bonarensis, B. dimorphicus and B. shacra, the specimens are not available for examination. Thus, the lateral line scale counts
used for comparison are from the published data, which might include the pored
scales behind the hypural plate which are normally 2–3. However, the differences in the counts
are great and we can confirm these to be different.
Kar & Sen (2007) listed three species
of Barilius viz., B. barna, B. vagra and B. shacra from the Koladyne River basin but they
neither gave descriptions of the species nor mentioned where the collections
were eventually deposited. The
three species are not represented from the basin in our collections. However, we compared B. profundus sp. nov. with B. barna, B vagra from the Dikrong and Barak rivers (both Brahmaputra drainage)
respectively and with B. shacra using the published
data. As noted above, the three
species are readily distinguishable from the new species.
Comparative material
Barilius barila: MUMF 5049, 5051, 83.2–89.5
mm SL, Khuga River, Churchandpur,
Manipur, India.
Barilius barna: MUMF 27061–27064, 73.0–83.1 mm SL,Dikrong River, Arunachal Pradesh, India.
Barilius bendelisis: MUMF 27067–27068,
100.3–105.8 mm SL, Iyei River, Noney, Manipur, India; MUMF 27069–27072, 72.4–105
mm SL, western side of Maram Khulen& Laironching, Manipur, India.
Barilius chatricensis: MUMF 503/1 (holotype), 86.4mm SL, ChatrickongRiver, Ukhrul District, Manipur, India. 150 km from Imphal. Additional data from Selim & Vishwanath (2002).
Barilius dogarsinghi: MUMF 207–210, 52.9–72.2
mm SL, Chakpi stream, Manipur, India.
Barilius ngawa: MUMF 149 (holotype),
96.5mm SL, Sherou River (tributary of Manipur river),
83km south of Imphal, Manipur, India; MUMF 27056–27058,
80.0–82.9 mm SL, Singda, Manipur, India.
Barilius lairokensis: MUMF 27075, 105.0 mm SL, Moreh bazar, Moreh,Chandel District, Manipur, India.
Barilius vagra: MUMF 4091–4093, 88.0–107.3 mm SL,
Barak River, Vanchengphai, TamenglongDistrict, Manipur, India.
Barilius tileo: MUMF 27076, 128.1mm SL, UmtraoRiver, Byrnihat, Norbong, Ribhoi District, Assam, India.
Barilius dimorphicus: Data from Tilak & Husain (1990).
Barilius bonarensis: Data from Chaudhuri (1912).
Barilius shacra: Data from Talwar & Jhingran (1991).
Barilius radiolatus: Data from Gunther (1868).
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