A new species of Glyptothorax (Teleostei: Sisoridae) from the Brahmaputra River basin, Arunachal Pradesh, India

Zootaxa ◽  
2021 ◽  
Vol 5023 (2) ◽  
pp. 239-250
Author(s):  
LAISHRAM KOSYGIN ◽  
PRATIMA SINGH ◽  
SHIBANANDA RATH
Keyword(s):  
River Basin ◽  
Indian Subcontinent ◽  
Dorsal Surface ◽  
Ventral Surface ◽  
Northeast India ◽  
Arunachal Pradesh ◽  
Brahmaputra River ◽  
Body Depth ◽  
Pectoral Spine ◽  
Pelvic Fin

Glyptothorax rupiri, a new sisorid catfish, is described from the Brahmaputra River basin in Arunachal Pradesh, northeast India. It differs from its congeners in the Indian subcontinent by the following combination of characters: the presence of plicae on the ventral surface of the pectoral spine and first pelvic-fin ray; a posteriorly serrated dorsal-fin spine, its length 11.3–12.2% SL; body depth at anus 11.2–13.4% SL; a thoracic adhesive apparatus longer than broad, with a V-shaped median depression which opens posteriorly; an arrow-shaped anterior nuchal plate element; adipose-fin base length 10.9–12.6% SL; nasal barbel not reaching anterior orbital margin; 14–18 serrae on posterior margin of the pectoral-fin spine; body with two longitudinal pale-cream stripes; densely tuberculated skin; and the presence of numerous tubercles on the dorsal surface of pectoral and pelvic-fin rays.  

Exostoma kottelati, a new species of catfish (Teleostei: Sisoridae) from Arunachal Pradesh, India

Zootaxa ◽  
2019 ◽  
Vol 4585 (2) ◽  
pp. 369 ◽  
Author(s):  
ACHOM DARSHAN ◽  
WAIKHOM VISHWANATH ◽  
SANTOSHKUMAR ABUJAM ◽  
DEBANGSHU NARAYAN DAS
Keyword(s):  
New Species ◽  
River Basin ◽  
Arunachal Pradesh ◽  
Brahmaputra River ◽  
Caudal Peduncle ◽  
Body Depth ◽  
Brahmaputra Basin ◽  
Adipose Fin ◽  
Peduncle Length ◽  
A New Species

Exostoma kottelati, new species, is described from the Ranga River, Brahmaputra basin, in Arunachal Pradesh state, northeastern India. It differs from congeners in the Brahmaputra River basin in having a longer adipose-fin base (33.4–36.0 % SL vs. 23.4–32.9), a greater (except E. mangdechhuensis) pre-pelvic length (45.6–47.3 % SL vs. 39.3–44.6) and a greater pre-anal length (73.9–76.5 % SL vs. 62.2–70.1). It further differs from all known congeners by the following unique combination characters: the adipose fin is distinctly separated from the dorsal procurrent caudal-fin rays, pre-dorsal length 38.9–41.7% SL, adipose-fin base length 33.4–36 % SL, caudal peduncle length 18.7–21.1 % SL, caudal peduncle depth 8.8–9.5 % SL, and body depth at anus 12.5–13.5 % SL. This is the fifth species of Exostoma known from the Brahmaputra River basin. 

Description of Bagarius vegrandis, a new species of sisorid catfish from Indochina (Actinopterygii: Siluriformes), with notes on the identity of Bagarius bagarius

Zootaxa ◽  
2021 ◽  
Vol 4926 (1) ◽  
pp. 134-146
Author(s):  
HEOK HEE NG ◽  
MAURICE KOTTELAT
Keyword(s):  
New Species ◽  
Indian Subcontinent ◽  
Dorsal Surface ◽  
Valid Species ◽  
Head Width ◽  
Caudal Peduncle ◽  
Body Depth ◽  
Eye Diameter ◽  
Adipose Fin ◽  
Peduncle Length

Bagarius vegrandis, new species, is described from the Chao Phraya and Mekong river drainages. It differs from congeners in having a small maximum body size (to 220 mm SL vs. 520–1400 mm SL) and the adipose-fin origin markedly posterior to (vs. at vertical through or very slightly posterior to) the anal-fin origin. It further differs from congeners in having the following unique combination of characters: ovoid unculiferous plaques on dorsal surface of head, lateral margin of frontal not significantly deflected dorsally, eye diameter 11–15% HL, interorbital distance 23–28% HL, head width 18.3–22.3% SL, head depth 11.1–14.1% SL, filamentous extensions to first pectoral-fin element reaching to anus, dorsal spine width 10.6–13.9 times in its length, body depth at anus 8.7–12.0% SL, neural spines of the 4–6 vertebrae immediately anterior to adipose fin distally flattened but not forming series of prominent bumps along dorsal midline, length of adipose-fin base 10.8–13.0% SL, caudal-peduncle length 19.0–22.4% SL, caudal-peduncle depth 3.2–4.2% SL, 19–20 preanal vertebrae, and 39–40 total vertebrae. Bagarius bagarius (Hamilton, 1822) is demonstrated to be a species restricted to the Indian subcontinent (with Bagrus yarrelli Sykes, 1839, Pimelodus platespogon Valenciennes, in Jacquemont, 1839 and Pimelodus carnaticus Jerdon, 1849 as junior subjective synonyms) and Bagarius lica Volz, 1903 resurrected from synonymy with B. yarrelli as a valid species from Southeast Asia. 

Schistura larketensis, a new cavernicolous fish (Teleostei: Nemacheilidae) from Meghalaya, Northeast India

Zootaxa ◽  
2017 ◽  
Vol 4353 (1) ◽  
pp. 89
Author(s):  
HRISHIKESH CHOUDHURY ◽  
D. KHLUR B. MUKHIM ◽  
SUDEM BASUMATARY ◽  
DEISAKEE P. WARBAH ◽  
DANDADHAR SARMA
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Ventral Surface ◽  
Northeast India ◽  
Lateral Line System ◽  
Brahmaputra River ◽  
Line System ◽  
Limestone Cave ◽  
A New Species

Schistura larketensis, a new species of cavernicolous loach, is described from Khung, a limestone cave in Meghalaya, India. The species differs from Schistura papulifera, its only troglomorphic congener from northeast India, in having a smooth ventral surface of the head, the presence of a small cylindrical axillary pelvic lobe, and the presence of three pores in the supratemporal canal of the cephalic lateral-line system. Apart from these differences, the species can be immediately distinguished from all other species of Schistura from the Brahmaputra River and neighboring basins by the complete absence (or only vestigial presence) of eyes. 

Akysis bilustris, a new species of catfish from southern Laos (Siluriformes: Akysidae)

Zootaxa ◽  
2011 ◽  
Vol 3066 (1) ◽  
pp. 61
Author(s):  
HEOK HEE NG
Keyword(s):  
New Species ◽  
Base Length ◽  
Caudal Peduncle ◽  
Body Depth ◽  
Pectoral Spine ◽  
Eye Diameter ◽  
Adipose Fin ◽  
Peduncle Length ◽  
A New Species ◽  
Pelvic Fin

Akysis bilustris, new species, is described from the Xe Kong drainage (a subdrainage of the Mekong River) in southern Laos. It is distinguished from congeners in having a unique combination of the following characters: eye diameter 14.0– 17.5% HL, serrae on posterior margin of pectoral spine 2–3 and longer than half width of spine, pectoral fin reaching to or overlapping pelvic-fin base (length 24.5–29.3% SL), adipose-fin base length 14.3–18.3% SL, body depth at anus 11.4– 13.8% SL, caudal-peduncle length 19.6–23.4% SL, caudal-peduncle depth 6.7–9.2% SL, caudal fin emarginate, and vertebrae 30–31.

Glyptothorax gopii, a new species of catfish (Teleostei: Sisoridae) from Mizoram, north-eastern India

Zootaxa ◽  
2019 ◽  
Vol 4652 (3) ◽  
pp. 568-578
Author(s):  
LAISHRAM KOSYGIN ◽  
UJJAL DAS ◽  
PRATIMA SINGH ◽  
BASUDHARA ROY CHOWDHURY
Keyword(s):  
Anterior Margin ◽  
Indian Subcontinent ◽  
Northeast India ◽  
The Body ◽  
Valid Species ◽  
Eastern India ◽  
North Eastern ◽  
Fin Rays ◽  
A New Species ◽  
Pelvic Fin

Glyptothorax gopii, a new sisorid catfish, is described from the Kaladan River drainage in Mizoram, northeast India. It is distinguished from its congeners in the Indian subcontinent by the combination of the following characters: an axe-shaped anterior nuchal plate element extensively in contact with the posterior nuchal plate, plicae present on the ventral surfaces of the pectoral-fin spine and outer rays of pelvic-fin rays, an elliptical thoracic adhesive apparatus, the nasal barbel not reaching the anterior margin of the eye, tuberculate skin, and two pale cream longitudinal stripes on the body. Glyptothorax alaknandi is considered a valid species.  

Hyperobliquity of Changlang Block of eastern Arunachal Pradesh, India and the role of Mishmi Block, India and Hukawng Block, Myanmar in its development

2020 ◽  
Author(s):  
Farha Zaman ◽  
Uttam Goswami ◽  
Devojit Bezbaruah
Keyword(s):  
River Basin ◽  
Seismic Velocity ◽  
Indian Subcontinent ◽  
Research Work ◽  
Indian Plate ◽  
Fault System ◽  
Specific Reference ◽  
Dynamic Topography ◽  
Arunachal Pradesh

<p>Plate tectonic history of northeast Indian subcontinent can be viewed as a window to the<br>evolution of Southeast Asia. One such important tectonic feature is the northern most part of<br>Indo-Burmese Ranges where this research work has been carried out. Here we propose an<br>evolutionary model that shows northward moving ‘horse-tail’ feature of the Hukawng Block<br>from the Burma basin, pushed this region towards the rigid Mishmi Block and Upper Assam<br>shelf, that caused the hyperoblique pattern of the ranges. It is the juxtaposition of the three<br>continental blocks: India-Asia-Burma, where there are tectonic and geomorphic influences in<br>the Block from both the Himalayan and Indo-Burmese orogeny. Stress distribution among<br>north-easterly moving Indian plate and comparatively stiff Eurasian and Burma plates, within<br>the India specific reference frame, is resulting in further changes. The study area mainly falls<br>under Changlang district of Arunachal Pradesh, India; and the regional study has been done in<br>the quadrangle from 26° to 28°N in latitudes and 95° to 97°E in longitudes. Morphotectonic<br>study, lineament analysis, fault system characterisation, focal plane mechanism along with<br>dynamic topography, seismic tomography and gravity anomaly have been incorporated in the<br>field evidences. Morphotectonic study for Noa-Dihing River basin has resulted in a value of<br>56.59 for Asymmetric Factor, which shows similar asymmetry result like in the Chi (χ)<br>analysis. This SW-ward tilted basin is moderately asymmetrical with Transverse Topographic<br>Symmetric Factor value of 0.42. This indicates that the major river basin along with other subbasins<br>are under the influence of active oblique rotational component. The regional lineaments<br>are showing mean orientations of N11°E-S11°W, N70°W-S70°E and EW whereas some local<br>trends of minor lineaments, in some places have mean orientations of N40°W-S40°E, N82°WS82°<br>E and N42°E-S42°W. In Mishmi block the major regional trends are N35°W-S35°E and<br>N40°E-S40°W comprising of probable cross-faults. In Hukawng Block, the lineament<br>orientation changes from N50°W-S50°E in the west to N30°W-S30°E, N-S and N15°E-S15°W<br>in the central valley region (north of Jade mines) and then to N50°E-S50°W in the eastern side.<br>Major fault systems are mostly thrust, with some showing very low angle slip component,<br>along with some oblique slip faults (e.g. Noa-Dihing River). The dynamic topography and<br>seismic tomographic studies indicate presence of a high seismic velocity zone beneath Mishmi<br>block indicating the crystalline rock materials. The block is still actively exhuming. Moreover,<br>Changlang and Hukawng blocks have undergone uplift and then phases of subsidence during<br>the last 20Ma. This indicates that the Low Velocity materials that are present underneath were<br>subjected to some crustal deformations. This tectonic process has also resulted in gravity<br>anomalies. The role of massive and rigid Mishmi block, comprising older crystalline rocks and,<br>later forming Burma basins formed the oblique rotation of the Changlang block which is<br>observed from all stated methods. Hukawng Block, which is controlled by the motion of<br>Sagaing Fault, have influenced the Changlang Block by its varied strike-slip stress components.<br>Moreover, Indo-Burmese Ranges also has an influence on this block and vice-versa.</p>

scholarly journals Rotifers (Rotifera: Eurotatoria) from wetlands of Majuli – the largest river island, the Brahmaputra river basin of upper Assam, northeast India

Check List ◽  
2014 ◽  
Vol 10 (2) ◽  
pp. 292 ◽  
Author(s):  
B. K. Sharma
Keyword(s):  
River Basin ◽  
New Record ◽  
Northeast India ◽  
Rare Occurrence ◽  
Brahmaputra River ◽  
Cosmopolitan Species ◽  
Small Wetlands ◽  
Regional Interest ◽  
The World ◽  
Occurrence Of Species

Plankton samples collected from the floodplain lakes (beels) and small wetlands (dobas or dubies) of Majuli, the largest river island of the world and a unique fluvial landform of the Brahmaputra river basin of northeast India, reveal 131 Rotifera species belonging to 33 genera and 17 families. Two Australasian (Australian & Asian), four Oriental, six Palaeotropical and one Holarctic species are biogeographically interesting elements; one species is a new record to India while several species are of regional interest. The rotifer fauna is predominantly tropical indicating high richness of cosmopolitan species and important contribution of tropicopolitan and pantropical species. Lecanidae > Lepadellidae are the most diverse families; Lecane Nitzsch > Lepadella Bory de St. Vincent > Trichocerca Lamarck are species-rich genera. The rotifers communities are characterized by several small-sized littoral-periphytic taxa, paucity of the Brachionidae in general and rare occurrence of species of Brachionus Pallas, Keratella Bory de St. Vincent, Filinia Bory de St. Vincent, Asplanchna Gosse and Polyarthra Ehrenberg in particular.

scholarly journals Aborichthys barapensis, a new species of river loach (Cypriniformes: Nemacheilidae) from Arunachal Pradesh, the eastern Himalaya, India

2021 ◽  
Vol 13 (7) ◽  
pp. 18800-18808
Author(s):  
P. Nanda ◽  
Lakpa Tamang
Keyword(s):  
New Species ◽  
River Basin ◽  
Standard Length ◽  
The State ◽  
Eastern Himalaya ◽  
Arunachal Pradesh ◽  
Brahmaputra River ◽  
Caudal Fin ◽  
A New Species

A new species of nemachilid loach Aborichthys barapensis, is described based on two adult specimens (91 and 97 mm SL) from the Barap Stream (a tributary of the Brahmaputra River basin) in the southeastern most part of the state of Arunachal Pradesh bordering Myanmar. The new species is distinguished from its congeners in having a narrow black basicaudal bar without a black ocellus on the upper end (vs. present); and in having a very low dorsal and ventral adipose crests (vs. prominent; absent in A. waikhomi). The new species is further distinguished from its congeners by the following combination of characters: body with 24–26 oblique bars along the flank; interspace narrower than bars on body; moderately rounded caudal fin with five distinct black to brown cross bars; vent closer to the caudal-fin base (44.1–45.1 % standard length) than to snout tip.

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