A new catfish, Harakoladynensis from northeastern India (Siluriformes: Erethistidae)
N. Anganthoibi 1 & W. Vishwanath 2
1,2 Department of Life Sciences,
Manipur University, Canchipur, Manipur 795003, India
Email: 1 angannong@gmail.com; 2 wvnath@gmail.com (corresponding
author)
Date of publication (online): 26
September 2009
Date of publication (print): 26
September 2009
ISSN 0974-7907 (online) |
0974-7893 (print)
Editor: Heok Hee Ng
Manuscript details:
Ms # o2271
Received 06 July 2009
Final received 22 August 2008
Finally accepted 31 August 2009
Citation: Anganthoibi, N. & W. Vishwanath(2009). A new catfish, Hara koladynensis from
northeastern India (Siluriformes: Erethistidae).Journal of Threatened Taxa 1(9): 466-470.
Copyright: © N. Anganthoibi & W. Vishwanath2009. Creative Commons Attribution 3.0 UnportedLicense. 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.
Author Details: N. Anganthoibi is a Project
Fellow under a project funded by the National Bureau of Fish Genetic resources,Lucknow. She is working on the inventory of the
catfishes of North East India and their phylogeneticanalysis. She is undergoing PhD on a relevant topic in the Department of Life
Sciences, Manipur University.
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 systematics of
freshwater fishes of northeastern India.
Author Contribution: The sudy: NA – survey, collection, morphometricand anatomic study of catfishes of northeastern India and their phylogenetics; WV – supervision of taxonomy and phylogeny
of freshwater fishes of northeastern India. Current paper: NA – detailed examination of the erethistidcatfishes of northeastern India and comparison with specimens in ZSI, Kolkata
and data of the related species of neighbouringcountries, establish identity of new species; WV – supervision in establishing
new species and discuss taxonomic status.
Acknowledgements: The authors are
grateful to Maurice Kottelat for providing literature
and to the director, ZSI, Kolkata, for permission to examine the type of Harahorai. The work is supported by catfish inventory
and phylogeny project sanctioned by National Bureau of Fish Genetic Resources, Lucknow.
Abstract: A
new Erethistid catfish species, Hara koladynensis is described from KoladyneRiver, Mizoram, India. It is distinguished from its congeners in having rough
(vs. smooth or serrated) anterior margin of dorsal spine; shorter pre-anal
length (58.5-60.9% SL vs. 63.2-75.2), longer head (36.0-38.3% SL vs.
24.8-34.2%), longer post-adipose distance (18.6-21.9% SL vs. 12.3-18.3), and
deeper body (21.9-25.2% SL vs. 11.5-20.9).
Keywords:New species, Erethistidae, catfish, Mizoram, India
For Figures, Images &
Tables – Click here
Introduction
Fishes of the genus Hara Blyth of
the family Erethistidae are characteristic in having
a stumpy body, unidirectional denticles along the
outer margin of pectoral fin, externally smooth and internally serrated dorsal
fin and a thorax with no adhesive apparatus (Hora1950). It is also characterized in
having coracoid with ventral anterior process,
pectoral spine with serrated anterior margin, antero-ventral
flange on the ventral surface of the complex centrumand the parapophysis of the fifth vertebra with a
vertical lamina (de Pinna 1996). The genus includes small to medium sized
catfishes having brown cryptic colouration and
heavily tuberculate skin inhabiting hill streams in
the subhimalayan region and western Indochina (Ng
& Kottelat 2007).
Hamilton (1822) described Pimelodus hara from
Hooghly River, India. Hora (1950) considered the species as a representative of
the genus Hara. Hara buchanani Blyth (1860) and Pimelodus asperus McClelland (1844) are now considered
junior synonyms of H. hara (Ng & Kottelat 2005; Ferraris 2007).
Day (1870) described Hara jerdoni from Sylhet district,
Bangladesh. Misra(1976) described H. horai from Terai and Duars, West Bengal. Ng
& Kottelat (2007) described H. longissima, H. minuscula and H.spinulus from Myanmar and H. mesembrina, H. filamentosafrom Thailand. They also treated H. saharsai Munshi & Srivastava (1988) and H. serrata Vishwanath & Kosygin (2000) as junior
synonyms of H. hara. Thus eight species of Hara are known
so far.
A recent collection of fishes from Koladyne River, Mizoram, India included a new Haraspecies which is herein described as H. koladynensis.
Material and Methods
Measurements were made on the left side
of specimens with dial calipers to the nearest 0.1mm following Ng & Kottelat (2007). Head length (HL) and measurements of body parts are presented as
proportions of standard length (SL) and subunits of head as of head length
(HL). Numbers in parentheses following meristic data denote number of specimens examined with that
count. Osteological structures were observed in
cleared and alizarin stained specimens. Vertebral counts followed Roberts (1989). Two paratypesof H. koladynensis (SL = 56.4 & 58.0 mm)
were dissected for osteology. Fin rays were counted
under a stereo-zoom light microscope. Type specimens are deposited in the Manipur University Museum of Fishes
(MUMF).
Harakoladynensis sp. nov.
(Image
1a,b & c)
Type
material
Holotype: 25.iv.2008, 22023’N
& 92057’E, 54.5mm SL; Koladyne River at Kolchaw, Lawntlai District,
Mizoram, India, coll. Nebeshwar & party, MUMF
10001.
Paratypes: 5 exs.,54.4-65.8 mm SL; data as for holotype, MUMF 10002.
Diagnosis
Hara koladynensis is
distinguished from its congeners by the following combination of characters:
rough (vs. smooth or serrated) anterior margin of dorsal spine; longer head
(36.0-38.3% SL vs. 24.8-34.2) and post-adipose distance (18.6-21.9% SL vs.
12.3-18.3); deeper body (21.9-25.2% SL vs. 11.5-20.9) and shorter preanal length (58.5-60.9% SL vs. 63.2-75.2).
Description
Morphometric data are shown
in Table 1. Body
robust, moderately compressed laterally. Dorsal profile gently curved from tip of snout to level of nares, then sloping steeply to the origin of dorsal fin and
evenly sloping ventrally to the end of caudal peduncle. Ventral profile roughly
straight and flat upto origin of pelvic fin, then
gently sloping dorsally to the end of caudal peduncle. Head ventrally compressed
and longer than width. Supraoccipitalprocess long reaching anterior tip of nuchal plate. Eyes moderate, superior in position.
Snout narrow, profile dorsally curved
and rounded when viewed laterally and acutely triangular when viewed from
above. Snout with
pronounced steepening of curvature anteriorly at
level of posterior nares when viewed laterally. Anterior and posterior opening of nareslarge and separated by flap of skin comprising base of nasal barbel. Gill opening narrow, extending ventrally uptothe level of base of coracoid process. Bony elements of dorsal surface of head very prominent and
covered with thin tuberculate skin.
Barbelsin four pairs. Maxillary barbelwhen adpressed extend beyond the base of the pectoral
spine. Nasal barbel short, subtending by a flap of skin at base and
extending to midway between posterior edge of posterior naresand anterior margin of orbit. Anterior mandibular barbelwhen adpressed reaching the anterior base of pectoral
spine; posterior mandibular, when adpressedreaching the gill opening.
Mouth inferior, premaxillarytooth band not exposed when mouth is closed. Upper lip with indistinct plicae. Oral teeth small and villiform, in irregular rows on all tooth-bearing surfaces. Premaxillary teeth in single crescentic band across
midline. Palate
edentulous. Dentaryteeth in two narrow crescentic bands separated at
midline. Anus and urogenitalopenings located straight through posterior three quarters of adpressed pelvic fin. Skin tuberculated, distributed evenly throughout head and body. Lateral line complete and
mid lateral. Vertebrae 15+17=32(2). Dorsal fin located above anterior third of
body, with I,5,i (6) rays. Dorsal spine moderately long and gently
curved backward with rough anterior margin, posterior margin with 5-6 serrae. Adipose fin with anterior margin straight and posterior margin angular.Caudal fin with i,7,7,i (5) or i,6,7,i (1) principal rays. Lower lobe of caudal fin
slightly longer than the upper lobe. Anal-fin base approximately in line with adipose-fin
base. Anal fin with iii,7 (6) rays. Pelvic fin with i,4,i(1) or i,5 (5) rays. Pectoral fin with I,6,i rays; anterior margin with 15-25 small distally
directed serrations, posterior margin with 7-12 large medially directed
serrations. Coracoid with well developed
posterior processes, extending to two thirds distance between base of posteriormost pectoral-fin ray and pelvic-fin origin.
Coloration: Head and body
dark chestnut to dark chocolate brown. Belly and ventral surface of head light brown, that of head lighter and creamish. Two
thin irregular light brown bars on body; first chevron-shaped and located
between dorsal and adipose-fin bases, second thicker than first located on
caudal peduncle. Dorsal fin dark brown except for thin hyaline distal margin. Pectoral fin brown with
thin hyaline distal margin and either a small ovoid hyaline spot or a crescentic median hyaline band on middle third of fin. Pelvic and anal fins
hyaline, with dark brown bases and subdistal stripes. Adipose fin brown as in
body, with lighter coloured distal margin. Caudal fin hyaline, with irregular W-shaped
band subdistally and with small dark brown flecks
randomly distributed throughout fin. Maxillary and mandibular barbel light brown, with dark brown annuli.
Etymology
The species is named after Koladyne River, Mizoram, India, itstype locality.
Distribution
Presently known
from Koladyne River at Mizoram, India (Fig. 1).
Discussion
Hara koladynensis is
easily distinguished from its congeners by the combination of characters
mentioned in diagnosis. The new species also differs from H. jerdoni in having longer caudal peduncle (18.8-21.8% SL
vs. 14.9-15.4) and shorter pectoral spine (28.9-31.0% SL vs. 42.2-51.7); from H.horai in having wider eye diameter (11.5-17.5% HL
vs. 8.0-9.0) and from both the species in having longer caudal fin (30.2-32.2%
SL vs.20.5-27.9).
Hara koladynensis further differs
from H. hara in having rough (vs. serrated)
anterior margin of dorsal spine; shorter maxillary barbel(55.7-69.5% HL vs. 80.8-108.2) and dorsal spine (16.1-20.0% SL vs. 22.7-27.4);
from H. minuscula in having shorter posterior
process on coracoid (23.4-27.0% SL vs. 29.5-32.3) and
inner mandibular barbel(30.6-35.6% HL vs. 40.0-57.1); from H. spinulus in
having shorter inner mandibular barbel(30.6-35.5% HL vs. 43.1-53.7), longer caudal peduncle (18.8-21.8% SL vs.
11.8-15.0) and post-adipose distance (18.6-21.9% SL vs. 12.4-17.7) and
from all of them in having shorter outer mandibular barbel (37.6-45.0% SL vs. 52.1-73.8). The new species can also be distinguished from
both H. mesembrina and H. longissima in having absence (vs. presence) of a
filamentous extension of the first principal ray of upper caudal fin lobe, fromH. longissima in having shorter inner mandibular barbel (30.6-35.5% HL
vs. 40.7-50.3), outer mandibular barbel(37.6-45.0% HL vs. 53.5-72.3) and dorsal spine (16.1-20.0% SL vs. 22.6-26.7)
and from H. filamentosa in having longer
posterior coracoid process (23.4-27.0% SL vs.
19.9-22.8).
Most of the highly
specialized rheophilic fish species in Southeast Asia
have restricted distribution ranges (Kottelat 2001). Hara koladynensis is
found in the Koladyne River (also known as Kaladan or Chimtuipui) which
originates from the western face of Chin Hills in Myanmar bordering Mizoram and
Manipur states of India. At Kolchaw, the river bottom is rocky and the water current is
very fast. The river is not connected with Ganga-Brahmaputra and Chindwin-Irrawaddy drainages as it is
respectively separated by the Chittagong hill tract and the Arakan Yoma hill range. The isolated habitat is expected to support many endemic species
including the new species.
Comparative
material
Harafilamentosa: Data from Ng &Kottelat(2007).
Harahara; MUMF 2508, 2509, 7054, 7055, 48-60 mm
SL, Jiri R., tributary of Barak R., Manipur, India;
MUMF 2507, 58.3 mm SL, Barak R., Manipur, India. Additional data from Ng
&Kottelat (2007).
Harahorai; ZSI - FF955 (neotype),
56.1 mm SL; Terai & Duars,
N. Bengal. Additional
data from Ng &Kottelat (2007).
Harajerdoni: Data from Ng &Kottelat(2007).
Haralongissima: Data from Ng &Kottelat(2007).
Haramesembrina: Data from Ng &Kottelat(2007).
Haraminuscula: Data from Ng &Kottelat(2007).
Haraspinulus: Data from Ng &Kottelat(2007).
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