FIGURE 2 - uploaded by Heok Hee Ng
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Lateral views of first dorsal fin pterygiophore: a. without bony spur on anterodorsal surface; condition seen in Pseudecheneis paviei, P. sulcata, P. sulcatoides and P. sympelvica (P. sulcata, UMMZ 243677, 83.8 mm SL illustrated), and b. with bony spur on anterodorsal surface; condition seen in all other Pseudecheneis species (P. stenura, paratype, CAS 219177, 85.1 mm SL illustrated). Scale bar indicates 2.5 mm.
Source publication
The identity of Pseudecheneis sulcata is clarified in this study, and the species is redescribed. Pseudecheneis sulcata (from the Brahmaputra River drainage) can be distinguished from congeners in having a unique combination of the lack of a prominent bony spur on the anterodorsal surface of the first dorsal-fin pterygiophore, presence of a first d...
Contexts in source publication
Context 1
... sulcata is distinguished from congeners except P. paviei, P. sulcatoides, and P. sympelvica in lacking a prominent bony spur on the anterodorsal surface of the first dorsal-fin pterygiophore (vs. spur present; Fig. 2). Pseudecheneis sulcata can be distinguished from P. paviei and P. sympelvica in having an elongate body with 36-39 vertebrae (vs. short body with 33-35 vertebrae) and 12-14 (vs. 8-12) transverse laminae on the thoracic adhesive apparatus, and further differs from P. sympelvica in having separate (vs. fused) pelvic fins. It differs ...
Context 2
... eddsi is distinguished from congeners in having smaller pelvic fins (18.0-20.9% SL vs. 20.4-28.7), and from P. paviei, P. sulcata, P. sulcatoides, and P. sympelvica in having a prominent bony spur on the anterodorsal surface of the first dorsal- fin pterygiophore (vs. spur absent; Fig. 2). It further differs from P. crassicauda in having a slenderer caudal peduncle (3.5-5.3% SL vs. 6.0-6.6) and larger eye (9.6-12.8% HL vs. 7.5-8.3), and from P. immaculata in having (vs. lacking) pale colored patches on the body and a shorter adipose-fin base (19.5-24.3% SL vs. 27.7). Pseudecheneis eddsi is further distinguished from P. ...
Context 3
... stenura sp. nov. (Fig. 5 Fig. 2) and from P. paviei and P. sympelvica in having more vertebrae (38-40 vs. 33-35) and transverse laminae on the thoracic adhesive apparatus (14-18 vs. 8-12), from P. sympelvica in having the pelvic fins separate (vs. fused at midline) and the sulcae on the thoracic adhesive apparatus continuous (vs. interrupted) across the midline, and ...
Context 4
... key character used in diagnosing species of Pseudecheneis is the shape of the first dorsal fin pterygiophore. Two morphological states exist: the absence (Fig. 2a) or presence (Fig. 2b) of a prominent bony spur on the anterodorsal surface of the first dorsal fin pterygiophore. The dorsal surface of this bony spur is co-ossified with the anterior tip of the anterior nuchal plate (itself part of the first dorsal fin pterygiophore). The shape of this element with regards to the presence/absence of ...
Context 5
... key character used in diagnosing species of Pseudecheneis is the shape of the first dorsal fin pterygiophore. Two morphological states exist: the absence (Fig. 2a) or presence (Fig. 2b) of a prominent bony spur on the anterodorsal surface of the first dorsal fin pterygiophore. The dorsal surface of this bony spur is co-ossified with the anterior tip of the anterior nuchal plate (itself part of the first dorsal fin pterygiophore). The shape of this element with regards to the presence/absence of the spur is constant ...
Citations
... Contemporary environmental change affects alpine rivers in the HKH and across the globe, with impacts likely to intensify in the future (Lu and Liu, 2010;Pandit et al., 2014;Aukema et al., 2017). The present study suggests that regional recognized aquatic biodiversity in the HKH remains intact, if understudied; indeed, new species are still being discovered here (e.g., Ng, 2006;Conway et al., 2011). Declines in local diversity, abundance, and species' ranges, however, portend future extirpations if corrective management actions are not taken. ...
Lotic ecosystems harbor a disproportionate amount of global biodiversity, but continue to experience extinction rates greater than terrestrial. Alpine rivers and streams are especially threatened due to high rates of warming, glacier melt impacts, landcover change, and impoundment. Lack of monitoring, however, hampers conservation efforts in many regions. The Hindu-Kush Himalaya (HKH) is experiencing rapid environmental change, but impacts on aquatic biodiversity are unknown. Using a unique long-term dataset, we investigated changes to local (alpha) and regional (gamma) fish species diversity across 38 sites on Nepal's Kaligandaki-Narayani River (KNR), and evaluated potential impacts of climate change. Our results indicate a significant decrease in mean abundance and local species richness, although regional diversity did not decline. Species ranges contracted between the 1990s and 2010s, with lower bounds and weighted means shifting to higher elevations. Range shifts coincided with water temperature warming between the 1990s and 2010s, particularly at more speciose lower elevation sites. Although widespread species loss has not yet occurred, decreasing abundance and contraction of species' ranges point to increased extirpation risk in the near future. Our results suggest that effective conservation strategies must identify and preserve thermal refugia, maintain habitat connectivity, manage terrestrial protected areas so that aquatic biodiversity also benefits, and establish sustainable fishery harvests to protect species diversity in the KNR and other threatened, under-studied alpine biodiversity hotspots.
... The only information on these two specimens is their scientific names and their locality, "India" (Table 1). These two species are known to be distributed in Bangladesh and India, respectively (Ng 2006;Ng and Lalramliana 2013). ...
... Rajbanshi (2001) reported seven endemic fish species from the mountainous cold waters of Nepal. However, 15 endemic fish species (Table 4) can be discerned from other literature sources (Ng & Edds, 2004Ng, 2006;Conway & Mayden, 2008, 2010GoN/MoFSC, 2014). ...
This review describes the current status of freshwater fish diversity, their IUCN categories and threats to fish fauna in Nepal. The freshwater systems of the country are known to harbor over 220 fish species, thereby indicating a rich ichthyofaunal diversity. However, this number varies from author to author. Cyprinidae is the most common and dominant taxon. A total of 15 endemic and 15 exotic fish species have been reported. A total of 34 fish species have been listed under the IUCN Red List threatened categories. Major threats to fish include damming and pollution. Fish diversity studies have mainly focused on inventories only. Studies focusing on river longitudinal aspects, the inclusion of spatio-temporal aspects, and rigorous taxonomic studies combined with genetic studies are crucial to develop strategic conservation measures of fish fauna in Nepal.
... Pareuchiloglanis is distinguished from the Exostoma group (Oreoglanis, Pseudexostoma, Exostoma, Myersglanis and Parachiloglanis) by having an interrupted post-labial groove, and from other members of Glyptosternon group (Glyptosternon, Parachiloglanis, Euchiloglanis (Chimarrichthys) and Creteuchiloglanis) by having the premaxillary tooth band confluent medially and not produced posteriorly at the sides, and lower lip directly connected to the base of maxillary barbel (Chu & Mo 1999;Ng 2004; Thomson & Page 2006;Zhou et al. 2011). As with other glyptosternoid fishes, Pareuchiloglanis species are adapted to torrential mountain streams and rivers (Hora & Silas 1952a), and have restricted distributions (Ng 2006). They are chiefly found in headwater of river drainages (Ng 2004), ranging from the Salween drainage of Myanmar in the west to the upper Yangtze drainage of China in the east, and can reach to the Annamese Mountain drainages of Vietnam in the south. ...
A new glyptosterniod catfish, Pareuchiloglanis hupingshanensis, is described on the basis of 29 specimens, which were collected from Hunan Hupingshan National Nature Reserve (HHNNR) in the Yangtze River basin, China. It can be distinguished from all congeners by morphology and sequences of the cytochrome b gene. Morphometric and molecular data show that the new species is closely related to P. sinensis Hora et Silas but differs from it in possessing a premaxillary tooth band with a deeper median indentation; a dentary tooth band which consists of two shorter and wider patches; a lower angle of gill opening, opposite to the base of the 4th or 5th (vs. second or third) branched pectoral-fin ray; an upper lip edged with dense papillae; the posterior end of the ventral fin falling distinctly short of (vs. almost reaching ) anus; a shorter dorsal fin; and a greater caudal-fin base depth.
... habits: No available literature Reproduction: No available literature Synonyms: Echiloglanis hodgarti, Euchiloglanis hodgarti, Euchiloglanis kamengensis, Exostoma blythii, Glyptosternum hodgarti Nepal distribution: Bajura, Mugu, Myagdi Habitat use: Rapid, mountain streams(Shaw and Shebbeare 1937;Talwar and Jhingran 1991); cold waters, torrential streams (Molur and Walker 1998). habits: Omnivorous (Molur and Walker 1998).Nepal distribution: TanahunHabitat use: Known only from Nepal; hill rivers with swift waters over rocky riffles(Ng 2006).Sisor rheophilus, KU 29109, 96.2 mm SL ...
We created dot maps to indicate the district-wise distributions of 141 fish species collected in Nepal in 1996 and archived at the University of Kansas Natural History Museum and Biodiversity Institute (KU). Collections spanned Himalayan mountains to subtropical lowlands in 3 major river drainages across 32 of Nepal's 75 districts, and fishes from 111 samples are archived in 1046 lots at KU. Collections comprised 10 orders and 29 families, including 76 species from 4 families of Cypriniformes, 41 species from 9 families of Siluriformes, 15 species from 8 families of Perciformes, 3 species from 2 families of Synbranchiformes, and 1 species each from Osteoglossiformes, Anguilliformes, Clupeiformes, Beloniformes, Cyprinodontiformes, and Tetraodontiformes. For each species, we provide scientific name, common name, a specimen photo, a district dot map, synonyms, names of districts in which the species was collected, and information on the species' habitat use, feeding habits, and reproduction. Our maps provide a more complete and precise plotting of the distribution of fishes in Nepal than previously available, and we substantiate these records with museum voucher specimens. Results of this work will useful to ichthyologists and others studying South Asian fishes, as well as to managers responsible for conserving this fauna.
... Their distribution in China includes the Honghe (Red River), Lancangjiang (the upper Mekong River), Nujiang (the upper Salween River), some branches of the Irrawaddy River and the Brahmaputra River. They are also found in adjacent countries, including Vietnam, Laos, Myanmar, India, Nepal and Pakistan Zhou & Chu, 1992;Roberts, 1998;Rainboth, 1996;Zhou & Zhou, 2005;Ng & Edds, 2005;Ng, 2006aNg, , 2006bNg & Tan, 2007;Vishwanath & Darshan, 2007). ...
... Until 2006, six species of Pseudecheneis have been recorded in China. They are Pseudecheneis intermedius Chu, P. immaculatus Chu, P. paviei Vaillant, P. stenura Ng, P. sulcata (McClelland) and P. sulcatoides Zhou & Chu (Chu, 1982;Zhou et al., 1992;Zhou & Zhou, 2005;Ng, 2006a). ...
... with pale colored patches). Ng (2006a) considered that Pseudecheneis sulcata was only distributed in Brahmaputra River drainage. ...
Presently, six species of Pseudecheneis have been recorded in China. They are Pseudecheneis intermedius Chu, P. immaculatus Chu, P. paviei Vaillant, P. stenura Ng, P. sulcata (McClelland) and P. sulcatoides Zhou & Chu. This study suggests that Pseudecheneis immaculatus, P. stenura and P. sulcatoides are valid species. Pseudecheneis intermedius is considered a junior synonym of P. paviei. Propseudecheneis tchangi, formerly treated as a junior synonym of Pseudecheneis sulcata, is a valid species belonging in Pseudecheneis and in China Pseudecheneis sulcata is only found in the Yaluzangbu River (Brahmaputra), Tibet. In addition, four new species from Yunnan are described. They are Pseudecheneis brachyurus, P. gracilis, P. longipectoralis and P. paucipunctatus. These four new species can be distinguished from each other by distinct stable morphological characters. They can be distinguished from all recorded species by certain characters. They differ from P. paviei in having 14-21 transverse ridges (laminae) of thoracic apparatus (vs. 9-13); differ from P. sulcatoides in having a neural spine of complex vertebra bifurcate (vs. single); differ from P. immaculatus in having yellow spots and patches at the occipital, post-temporal, origin and base end of the dorsal fin and adipose fin, and caudal fin base (vs. absent); differ from P. tchangi in having yellow spots and patches at origin and base end of the dorsal fin, origin and base end of the adipose fin, and the caudal fin base (vs. absent); differ from P. sulcata in having longer pelvic fin, reaching base of first anal fin ray (vs. not reaching); differ from P. crassicauda in having longer pectoral fin, reaching origin of pelvic fin (vs. not reaching); differ from P. serracula in having a shorter base of adipose fin (length of adipose fin base 125-166.7% in length of anal fin base vs. larger than 200%); and differ from P. sympelvica in having separate pelvic fins (vs. fused). Except P. gracilis, other three new species differ from P. stenura in having tubercles at caudal peduncle. Pseudecheneis gracilis differs from P. stenura in having a saddle patch at origin of dorsal fin (vs. isolated as two ovoid yellow patches on lateral of dorsal fin origin), and further in having shorter head length (head length 14.9-18.6 % SL vs. 20.1-23.7, postorbital head length 4.5-5.9% in head length vs. 8.5-11.4, body depth 73.9-112.2 % in head length vs. 67.1-88.5).
... Although I accept that this work has perhaps complicated the picture, I think this is more satisfactory than just lumping names together when it appears that there are differences that should be recognised. The recent work of Ng & Edds (2005) and Ng (2006) on Pseudecheneis catfish has shown that what was once thought to be a few species spanning Nepal, India, Bangladesh, Myanmar Laos and China are actually numerous species. Based on my interim findings I see a similar picture with Botia. ...
... Some authors have classed it as valid (notably Shrestha, and Edds) and others a junior synonym of B. almorhae (notably Menon). Ng 2006 andEdds 2005 have shown that specimens of a catfish species that occur in some of these rivers are actually distinct from other species in connected rivers. See discussion above under B. almorhae. ...
... 'Teesta' is the species described as B. blythi. Ng (2006) listed specimens of the catfish genus Pseudecheneis from the upper regions of the Teesta River drainage as conspecific with those from Nong Priang stream near Cherrapunji in Khasi Hills. It is therefore possible that the specimens listed as B. lohachata by Sen (1995) BMNH 1983.7.11.30, "Taui [Tawi] River, Jammu, India", presented by Jammu University, 1 spec. ...
... Zhou & Chu (1992) considered P. tchangi (Hora), a synonym of P. sulcata. Ng (2006) described P. stenura from Irrawaddy drainage in southern China and P. eddsi from Ganga drainage, Nepal. He redescribed P. sulcata and revalidated P. tchangi as a distinct species. ...
... P. sulcata (Mclelland, 1842) was originally described from Brahmaputra basin in Khasi hills, Meghalaya. Ng (2006) redescribed P. sulcata and reported of its restricted distribution in the Brahmaputra river drainage. He reported of the absence of bony spur on the first dorsal fin pterygiophores of P. sulcata, P. paviei, P. sulcatoides and P. sympelvica. ...
... 1. Pseudecheneis sulcata: MUMF 9090 (8), 70.4-103.6 mm SL; India: Sikkim, Tista River; and morphometric data of Ng (2006). ...
Two new catfish species of the genus Pseudecheneis, viz., P. ukhrulensis sp. nov. and P. sirenica sp. nov. are described from northeastern India, from streams of Ukhrul district, Manipur (Chindwin basin) and Siren River, Upper Siang District, Arunachal Pradesh (Brahmaputra basin), respectively. The two species can be distinguished from their closest congener P. sulcata in having prominent bony spurs on the anterodorsal surface of the first dorsal-fin pterygiophore (vs. absent), from P. crassicauda in shallower caudal peduncle, from P. serracula in shorter adipose fin base and from P. stenura in deeper caudal peduncle. P. sirenica sp. nov. is distinguished from P. eddsi in its longer pelvic fin and anal fin and from P. ukhrulensis sp. nov. in having longer pectoral fin and caudal peduncle. A key to identification of Pseudocheneis of India and Nepal is given.
... Sisorid catfishes of the genus Pseudecheneis Blyth, 1860, are diagnosed by a thoracic adhesive apparatus consisting of a series of transverse ridges (laminae) separated by grooves (sulcae) (de Pinna, 1996;Roberts, 1998), and are found in the upper reaches of rivers throughout the Subhimalayan and Indochinese region. Recent studies (Ng & Edds, 2005;Ng, 2006a;Ng, 2006b) recognize eleven valid species of Pseudecheneis: P. sulcata (M'Clelland, 1842); P. paviei Vaillant, 1904;P. tchangi (Hora, 1937); P. immaculata Chu, 1982;P. ...
... These differences are present in morphological characters (e.g. length of adipose-fin base, depth of caudal peduncle) that have been shown to be useful for diagnosing other congeners (Ng, 2006a;2006b;Ng & Edds, 2005). Furthermore, P. maurus is known from an area where the genus has not been previously recorded and where considerable endemicity in the freshwater ichthyofauna has been demonstrated (e.g. ...
A new species of sisorid catfish, Pseudecheneis maurus, is described from the Song Thuy Loan drainage in Central Vietnam. Pseudecheneis maurus can be distinguished from congeners in having a combination of a very short adipose-fin base (1.2 times length of anal-fin base vs. 1.5-2.0 times; 15.7% SL vs. 17.6-30.6), thoracic adhesive apparatus with sulcae not meeting at midline and the absence of distinct pale spots on the body.
... Sisorid catfishes of the genus Pseudecheneis Blyth, 1860 are diagnosed by a thoracic adhesive apparatus consisting of a series of transverse ridges (laminae) separated by grooves (sulcae) (de Pinna, 1996;Roberts, 1998), and are found in the upper reaches of rivers throughout the Subhimalayan and Indochinese region. Recent studies (Ng & Edds, 2005;Ng, 2006) recognize ten valid species of Pseudecheneis: P. sulcata (M'Clelland, 1842), P. paviei Vaillant, 1904, P. tchangi (Hora, 1937, P. immaculata Chu, 1982, P. sulcatoides Zhou & Chu, 1992, P. sympelvica Roberts, 1998, P. crassicauda Ng & Edds, 2005, P. serracula Ng & Edds, 2005, P. eddsi Ng, 2006 and P. stenura Ng, 2006. As part of a phylogenetic study of the Sisoridae, an examination of material collected from the Ganges River drainage in the state of Himachal Pradesh in northwestern India and previously identified as P. sulcata was undertaken. ...
... Sisorid catfishes of the genus Pseudecheneis Blyth, 1860 are diagnosed by a thoracic adhesive apparatus consisting of a series of transverse ridges (laminae) separated by grooves (sulcae) (de Pinna, 1996;Roberts, 1998), and are found in the upper reaches of rivers throughout the Subhimalayan and Indochinese region. Recent studies (Ng & Edds, 2005;Ng, 2006) recognize ten valid species of Pseudecheneis: P. sulcata (M'Clelland, 1842), P. paviei Vaillant, 1904, P. tchangi (Hora, 1937, P. immaculata Chu, 1982, P. sulcatoides Zhou & Chu, 1992, P. sympelvica Roberts, 1998, P. crassicauda Ng & Edds, 2005, P. serracula Ng & Edds, 2005, P. eddsi Ng, 2006 and P. stenura Ng, 2006. As part of a phylogenetic study of the Sisoridae, an examination of material collected from the Ganges River drainage in the state of Himachal Pradesh in northwestern India and previously identified as P. sulcata was undertaken. ...
... Sisorid catfishes of the genus Pseudecheneis Blyth, 1860 are diagnosed by a thoracic adhesive apparatus consisting of a series of transverse ridges (laminae) separated by grooves (sulcae) (de Pinna, 1996;Roberts, 1998), and are found in the upper reaches of rivers throughout the Subhimalayan and Indochinese region. Recent studies (Ng & Edds, 2005;Ng, 2006) recognize ten valid species of Pseudecheneis: P. sulcata (M'Clelland, 1842), P. paviei Vaillant, 1904, P. tchangi (Hora, 1937, P. immaculata Chu, 1982, P. sulcatoides Zhou & Chu, 1992, P. sympelvica Roberts, 1998, P. crassicauda Ng & Edds, 2005, P. serracula Ng & Edds, 2005, P. eddsi Ng, 2006 and P. stenura Ng, 2006. As part of a phylogenetic study of the Sisoridae, an examination of material collected from the Ganges River drainage in the state of Himachal Pradesh in northwestern India and previously identified as P. sulcata was undertaken. ...
A new species of sisorid catfish, Pseudecheneis suppaetula, is described from tributaries of the Ganges River in India. Pseudecheneis suppaetula can be distinguished from congeners in having a combination of a long adipose-fin base (at least 2.0 times length of anal-fin base; 26.6-30.6% SL), small eye (8.1-8.3% SL), the presence of pale spots on the body, and the neural spines of the last 2-3 preanal and first 6-7 postanal vertebrae gradually increasing in height.
