scholarly journals Fishes of the genus Olyra McClelland (Teleostei: Bagridae) from Indo-Bhutan hill streams of Assam, India

2013 ◽  
Vol 5 (2) ◽  
pp. 503-509
Author(s):  
Sewali Pathak ◽  
Mrigendra M. Goswami ◽  
Nripendra Nath Sharma
Keyword(s):  
Lower Lobe ◽  
The Other ◽  
Type Locality ◽  
Head Width ◽  
Type Specimens ◽  
Lower Range ◽  
Caudal Peduncle ◽  
Caudal Fin ◽  
Peduncle Length ◽  
The Himalaya

The type specimens described in this communication are collected from two hill streams, Kanamakra and Langkhar flowing from the Bhutan foothills of the Himalaya through Amguri and Amteka respectively in the Indo- Bhutan border of Chirang district (26015’ 0” - 2700’ 0” N and 90030’ 0” - 90045’ 0” E) of Assam. The occurrence of three catfishes species of the genus Olyra, of which Olyra horae is recorded as a new report from the type locality of Assam. The taxonomic variables of O. horae are compared with other two species namely, O. kempi and O.longicaudata. The O. horae is distinguished from the other two congeners in having the caudal fin forked but not high, upper lobe slightly elongated with 10 rays and lower lobe with 9 rays. It can also be distinguished in having the higher range of the caudal peduncle length (16.9 - 20.0 % SL), pre-anal length (60.1 - 71.4 % SL), head width (81.3 - 81.6 % HL) and the lower range of snout length (21.7 - 24.3 % HL), outer mandibular barbel length (55.7 - 57.3 % HL) in comparison to the other two congeners.

scholarly journals Redescription of Ochmacanthus batrachostoma (Miranda-Ribeiro, 1912) (Siluriformes: Trichomycteridae): a possible case of incipient paedomorphism

2016 ◽  
Vol 14 (1) ◽  
Author(s):  
Caio S. Neto ◽  
Mário de Pinna
Keyword(s):  
Body Size ◽  
Internal Anatomy ◽  
Morphometric Traits ◽  
Type Specimens ◽  
Caudal Peduncle ◽  
Caudal Fin ◽  
Maximum Body ◽  
Maximum Body Size

ABSTRACT The lepidophagous stegophiline catfish Ochmacanthus batrachostoma (Miranda-Ribeiro, 1912) is endemic to the Paraná-Paraguai basin and is the only member of its genus in that drainage. It remains a poorly-known taxon mainly due to the historical scarcity of study specimens. The species is herein redescribed on the basis of type and non-type specimens from Brazil, Argentina and Paraguay. Ochmacanthus batrachostoma can be distinguished from congeners by the presence of long maxillary and rictal barbels, reduction of the posterior end of the caudal peduncle, a tadpole-like caudal fin and peduncle, among other morphometric traits and features of internal anatomy. Comparisons show that a number of unique traits of adult O. batrachostoma resemble conditions seen in juvenile specimens of other members of Stegophilinae. Such traits are also more pronounced in juveniles of O. batrachostoma itself. The species also has the smallest maximum body size in Ochmacanthus and among the smallest of any stegophiline. In combination, such observations suggest that the species is paedomorphic, although to a degree less extreme than seen in some other trichomycterids. This is the first possible case of paedomorphosis identified for stegophilines.

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. 

scholarly journals Molecular conformation of then published Ziziphus budhensis and its religious and economic values

2017 ◽  
Vol 27 (1) ◽  
pp. 55-59
Author(s):  
M. L. Pathak ◽  
H. C. Li ◽  
B. Xu ◽  
X. F. Gao ◽  
K. K. Pokharel ◽  
...  
Keyword(s):  
New Species ◽  
Molecular Conformation ◽  
The Other ◽  
Type Locality ◽  
Type Specimens ◽  
Economic Values ◽  
Molecular Analyses ◽  
Dna Analyses ◽  
Morphological Differences ◽  
A New Species

  The newly described species, Ziziphus budhensis was confirmed as Chinese Jujuba, Z. xiangchengensis on the basis of their DNA analyses. Z. budhensis was explained as a new species on the basis of some morphological differences in 2015. In the Year 2016, the DNA samples were collected from the type locality of Nepal, and the molecular analyses were carried out. The type specimens and the other available images from the different herbariums were examined. Besides, the protologue and the type images were studied carefully. The result showed that though there were some differences in the habit and the habitat of the plant, the previously described new species, Z. budhensis was found to be same as the Chinese species, Z. xiangchengensis. This study also showed the importance of the molecular work of Z. budhensis and confirmed it morphologically distinct although it was very close to the Chinese species.Banko Janakari, Vol. 27, No. 1, page: 55-59

Amblyceps cerinum, a new catfish (Teleostei: Amblycipitidae) from northeastern India

Zootaxa ◽  
2010 ◽  
Vol 2672 (1) ◽  
pp. 50 ◽  
Author(s):  
HEOK HEE NG ◽  
JEREMY J. WRIGHT
Keyword(s):  
South Asian ◽  
West Bengal ◽  
New South ◽  
Taxonomic Status ◽  
Caudal Peduncle ◽  
Caudal Fin ◽  
Dorsal Fin ◽  
Adipose Fin ◽  
Peduncle Length ◽  
Fin Length

Amblyceps cerinum, a new South Asian amblycipitid catfish species, is described from the Brahmaputra River drainage in northern West Bengal, India. The new species can be distinguished from congeners in having a combination of upper jaw longer than lower, incomplete lateral line terminating beneath posterior insertion of dorsal fin, length of adipose-fin base 32.4–38.3% SL, caudal peduncle length 21.9–24.5% SL, caudal peduncle depth 9.2–11.2% SL, 41–44 postWeberian vertebrae, posterior end of adipose fin separated from dorsal procurrent caudal-fin rays by distinct notch, and truncate caudal fin. The taxonomic status of A. tenuispinis is also discussed and a neotype designated for this species.

Speolabeo hokhanhi, a new cavefish from Central Vietnam (Teleostei: Cyprinidae)

Zootaxa ◽  
2018 ◽  
Vol 4476 (1) ◽  
pp. 109 ◽  
Author(s):  
NGUYEN DINH TAO ◽  
LIANG CAO ◽  
SHUQING DENG ◽  
E ZHANG
Keyword(s):  
New Species ◽  
River Basin ◽  
National Park ◽  
Caudal Peduncle ◽  
Caudal Fin ◽  
Lower Lip ◽  
Central Vietnam ◽  
Peduncle Length ◽  
Pelvic Fin

Speolabeo hokhanhi, new species, is here described from Hang Va Cave in Phong Nha-Ke Bang National Park (Son River basin) in Central Vietnam. It can be distinguished from S. musaei by having no papillae on the lower lip, no hump immediately behind the head, a duckbilled snout, a shorter caudal peduncle (length 16.8–18.6% SL), and the pelvic fin inserted closer to the snout tip than to the caudal-fin base.

Redescription of the serranid perchlet Chelidoperca pleurospilus (Günther, 1880)

Zootaxa ◽  
2020 ◽  
Vol 4830 (1) ◽  
pp. 141-160
Author(s):  
MIZUKI MATSUNUMA ◽  
FUMIHITO TASHIRO
Keyword(s):  
Lateral Line ◽  
New Caledonia ◽  
Morphological Changes ◽  
Lower Lobe ◽  
Ventral Surface ◽  
Andaman Sea ◽  
Type Specimens ◽  
Caudal Fin ◽  
Lower Jaw ◽  
Northwestern Australia

Chelidoperca pleurospilus (Günther, 1880) (Perciformes: Serranidae) is redescribed on the basis of the lectotype (designated herein) and 69 non-type specimens from the eastern Indian and western Pacific oceans, ranging from the Andaman Sea east to New Caledonia, and northwestern Australia north to Japan. Literature records of the species from the Red Sea and Madagascar are considered applicable to Chelidoperca occipitalis Kotthaus 1973. Chelidoperca pleurospilus is characterized by the following combination of characters: pectoral-fin rays 14–16 (modally 15); pored lateral-line scales 40–43 (43); scale rows in longitudinal series 42–47 (44); scale rows between lateral line and base of 6th dorsal-fin spine 4 (3 full-sized scales plus 1 half-sized); interorbital scales reaching mid-orbit level, not extending beyond anterior margin of orbit; scales on lower jaw ventral surface restricted to angular, not extending anteriorly onto dentary; posterior tip of upper caudal-fin lobe slightly elongate with rounded or pointed contour, that of lower lobe not elongate, with rounded or truncate contour; longitudinal row of ca. 5 dark, laterally elongate blotches (more-or-less continuous in small specimens <60 mm SL) along mid-body from behind head to caudal-fin base. The species is compared with its congeners, and morphological changes with growth in the former discussed in detail. 

Pseudolaguvia viriosa, a new catfish (Teleostei: Sisoridae) from north-eastern India

Zootaxa ◽  
2012 ◽  
Vol 3522 (1) ◽  
pp. 81 ◽  
Author(s):  
HEOK HEE NG ◽  
LAKPA TAMANG
Keyword(s):  
Dorsal Spine ◽  
Head Width ◽  
Caudal Peduncle ◽  
Body Depth ◽  
Spine Length ◽  
North Eastern ◽  
Pectoral Spine ◽  
Eye Diameter ◽  
Adipose Fin ◽  
Peduncle Length

This study describes Pseudolaguvia viriosa, a new miniature sisorid catfish from the Brahmaputra River drainage in Ar-unachal Pradesh, northeastern India. Pseudolaguvia viriosa can be distinguished from congeners in having a combinationof: eye diameter 10–15% HL, interorbital distance 35–38% HL, head width 21.5–23.5% SL, thoracic adhesive apparatusreaching beyond base of last pectoral-fin ray, pectoral spine length 26.9–32.9% SL, dorsal spine length 23.4–29.0% SL,dorsal spine with anterior edge smooth or with rugose surface only on distal third of spine, body depth at anus 16.9–19.0%SL, length of adipose-fin base 12.5–15.4% SL, caudal peduncle length 14.8–17.7% SL, caudal peduncle depth 7.4–9.8% SL, caudal-fin length 26.5–32.4% SL, 28–29 vertebrae, and one or more distinct pale bands encircling body.

scholarly journals Akysis longifilis, a new species of catfish (Teleostei: Akysidae) from Myanmar

Zootaxa ◽  
2006 ◽  
Vol 1150 (1) ◽  
pp. 19 ◽  
Author(s):  
HEOK HEE NG
Keyword(s):  
New Species ◽  
Species Group ◽  
Head Width ◽  
Posterior Edge ◽  
Caudal Peduncle ◽  
Body Depth ◽  
Pectoral Spine ◽  
Adipose Fin ◽  
Peduncle Length ◽  
A New Species

Akysis longifilis, new species, is described from the Sittang River drainage in Myanmar. It is a member of the A. variegatus species group and can be distinguished from congeners in the group (except for A. brachybarbatus, A. fuliginatus, A. pictus, A. prashadi, A. variegatus, A. varius and A. vespa) in having a smooth (vs. serrated) posterior edge of the pectoral spine. It is distinguished from A. brachybarbatus, A. fuliginatus, A. pictus, A. prashadi, A. variegatus, A. varius and A. vespa in having a unique combination of: length of adipose-fin base 25.7–31.1% SL, body depth at anus 9.7–13.6% SL, caudal peduncle length 18.3–23.2% SL, caudal peduncle depth 5.6–7.2% SL, head width 21.1–24.7% SL, nasal barbel length 67.4–96.4% HL, maxillary barbel length 123.2–159.6% HL, vertebrae 33–35, body with light saddle-shaped spots, and caudal fin forked.

Silurichthys ligneolus, a new catfish (Teleostei: Siluridae) from southern Borneo, Indonesia

Zootaxa ◽  
2011 ◽  
Vol 2793 (1) ◽  
pp. 56
Author(s):  
HEOK HEE NG ◽  
HEOK HUI TAN
Keyword(s):  
New Species ◽  
Lower Lobe ◽  
Branchial Arch ◽  
Caudal Peduncle ◽  
Body Depth ◽  
Caudal Fin ◽  
Fin Rays ◽  
Eye Diameter ◽  
Gill Raker ◽  
A New Species

Silurichthys ligneolus, a new species of silurid catfish, is described from blackwater habitats in southern Borneo. The new species can be distinguished from congeners in having a combination of: body depth at anus 9.1–11.0% SL, caudal peduncle depth 4.7–5.5% SL, eye diameter 6.7–9.8% HL, pelvic fins present, 44–45 anal-fin rays, 3–4 principal rays on the lower caudal-fin lobe, lower lobe of caudal fin indistinct, 46–48 vertebrae, one gill raker on the first branchial arch, and body uniformly brown. Based on the morphology of its caudal fin, S. ligneolus is hypothesized to be the sister taxon of S. sanguineus.

scholarly journals Occurrence of the genus Amblyceps Blyth (Teleostei: Amblycipitidae) from the Indo-Bhutan streams of the Brahmaputra drainage of Assam, India

2014 ◽  
Vol 6 (1) ◽  
pp. 177-181
Author(s):  
Sewali Pathak ◽  
Mrigendra M. Goswami ◽  
Nripendra Nath Sarma
Keyword(s):  
The Body ◽  
Caudal Peduncle ◽  
Caudal Fin ◽  
Eye Diameter ◽  
Orbital Space ◽  
Adipose Fin ◽  
Peduncle Length ◽  
General Appearance

Three species of the genus Amblyceps, namely, A. apangi, A. arunachalensis, A. mangois are described from Kanamakra and Langkhar (26°45′0″ ̶ 26°48′0″N and 90°35′0″ ̶ 90°40′0″E) hill streams of Chirang district of Assam. The torrent catfishes are distinguished within the genera on the basis of their general appearance of the body and the caudal fin structure, adipose fin, eye diameter, inter-orbital space, fold on lip and number of vertebrae. The caudal peduncle height for A. apangi (12.36 ̶ 12.73% SL), A. mangois (14.25 ̶ 15.36% SL) and A. arunachalensis(10.01 ̶ 11.42% SL), caudal peduncle length for A. apangi (20.29 ̶ 20.87% SL), A. arunachalensis (22.00 ̶ 22.11% SL) and A. mangois (19.09 ̶ 19.31% SL) and other taxonomic details of the congeners with their distributional status are discussed.

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