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Pseudolaguvia spicula, a new sisorid catfish (Teleostei: Sisoridae) from Bangladesh and northeastern India

Authors:
Heok Hee Ng at National University of Singapore
Heok Hee Ng
Lalramliana
Lalramliana
Lalramliana
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Abstract

This study describes Pseudolaguvia spicula, a new miniature sisorid catfish from the Surma-Meghna River system in India and Bangladesh. Pseudolaguvia spicula can be distinguished from congeners in having a combination of: head width 19.2–22.6% SL, dorsal-fin spine length 11.6–14.3% SL, length of dorsal-fin base 13.2–15.9% SL, pectoral-fin spine length 15.7–17.4% SL, length of adipose-fin base 14.7–17.1% SL, pelvic-fin length 14.6–17.1% SL, body depth at anus 12.8–16.8% SL, caudal peduncle length 15.4–17.9% SL, caudal peduncle depth 7.9–9.6% SL, caudal-fin length 24.2–27.5% SL, snout length 48.6–51.9% HL, eye diameter 10.6–13.9% HL, 30–32 vertebrae, smooth anterior edge of dorsal-fin spine, thoracic adhesive apparatus reaching beyond base of last pectoral-fin ray, absence of pale y-shaped marking on dorsal surface of head and supraoccipital process, and indistinct, pale vertical bands on body.
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Accepted by R. Pethiyagoda: 19 Jul. 2010; published: 4 Aug. 2010 61
ZOOTAXA
ISSN 1175-5326 (print edition)
ISSN 1175-5334 (online edition)
Copyright © 2010 · Magnolia Press
Zootaxa 2558: 61–68 (2010)
www.mapress.com/zootaxa/Article
Pseudolaguvia spicula, a new sisorid catfish (Teleostei: Sisoridae) from
Bangladesh and northeastern India
HEOK HEE NG1 & LALRAMLIANA2
1Raffles Museum of Biodiversity Research, National University of Singapore, 6 Science Drive 2 #03-01, Singapore 117546.
E-mail: heokhee@nus.edu.sg
2Department of Zoology, Pachhunga University College, Aizawl, Mizoram 796001, India. E-mail: lrl_zoo@yahoo.co.in
Abstract
This study describes Pseudolaguvia spicula, a new miniature sisorid catfish from the Surma-Meghna River system in
India and Bangladesh. Pseudolaguvia spicula can be distinguished from congeners in having a combination of: head
width 19.2–22.6% SL, dorsal-fin spine length 11.6–14.3% SL, length of dorsal-fin base 13.2–15.9% SL, pectoral-fin
spine length 15.7–17.4% SL, length of adipose-fin base 14.7–17.1% SL, pelvic-fin length 14.6–17.1% SL, body depth at
anus 12.8–16.8% SL, caudal peduncle length 15.4–17.9% SL, caudal peduncle depth 7.9–9.6% SL, caudal-fin length
24.2–27.5% SL, snout length 48.6–51.9% HL, eye diameter 10.6–13.9% HL, 30–32 vertebrae, smooth anterior edge of
dorsal-fin spine, thoracic adhesive apparatus reaching beyond base of last pectoral-fin ray, absence of pale y-shaped
marking on dorsal surface of head and supraoccipital process, and indistinct, pale vertical bands on body.
Key words: Siluriformes, Sisoroidea, Mizoram, Barak River, Surma-Meghna River system
Introduction
Among the three river systems that forms the Ganges Delta (Brahmaputra, Ganges and Surma-Meghna), the
Surma-Meghna is perhaps the least studied ichthyologically. Existing studies either focus on only a small part
of the drainage (e.g. Kar & Sen, 2007), or subsume the fish fauna of the drainage in more encompassing
works (e.g. Rahman, 2005). It is therefore not surprising to find that closer study of the freshwater fishes of
the Surma-Meghna River system reveals numerous species restricted to this drainage, particularly the
hillstream component of this fauna (e.g. Arunachalam et al., 2007; Vishwanath & Joyshree, 2007).
Among the species typically found in hillstreams of the Surma-Meghna River system and throughout the
northeastern part of the Indian subcontinent are the small sisorid catfishes of the genus Pseudolaguvia. This
genus is distributed in river drainages in the sub-Himalayan region and Myanmar (from the Ganges River
drainage eastwards to the Sittang River drainage). Pseudolaguvia shares the presence of a thoracic adhesive
apparatus consisting of longitudinal pleats of skin arranged in an elliptical field with Glyptothorax and
superficially resemble miniature versions of the latter, but possess a prominent postcoracoid processes. The
monophyly of Pseudolaguvia has been doubted by Ferraris & Britz (2005), but a phylogenetic analysis of the
Sisoridae using both morphological and molecular characters has confirmed Pseudolaguvia to be
monophyletic (Ng, 2006). Twelve species of Pseudolaguvia are considered valid (Ng & Lalramliana, 2010):
P. ribeiroi (Hora, 1921), P. shawi (Hora, 1921), P. tuberculata (Prashad & Mukerji, 1929), P. kapuri (Tilak &
Husain, 1975), P. tenebricosa Britz & Ferraris, 2003, P. foveolata Ng, 2005, P. inornata Ng, 2005, P. mur ica ta
Ng, 2005, P. ferul a Ng, 2006, P. ferruginea Ng, 2009, P. flavida Ng, 2009 and P. virgulata Ng & Lalramliana,
2010.
During recent ichthyological surveys of the Barak River drainage in Mizoram, India, the second author
collected specimens of a Pseudolaguvia species initially identified as P. fl a vida. Detailed comparison of this
material with congeners revealed it to belong instead to a previously unnamed species. The description of this
material as Pseudolaguvia spicula, new species, forms the basis of this study.
... Members of the south Asian sisorid catfish genus Pseudolaguvia are small sized benthic fishes, recorded not more than 47 mm SL, and occurs throughout hill streams and larger rivers along the sub-Himalayan foothills, spanning from the Ganges River drainage, Nepal in the west, Ganges-Brahmaputra River basin in the north and northeast India, the Bharatapuzha River, Western Ghats, Kerala, and the Kumaradhara River, Karnataka, in the south, the Brahmaputra drainages in Bangladesh and the Ayeyarwaddy and Sittang drainages in Myanmar in the east (Ng 2006a;Ng & Lalramliana 2010a;Ng & Lalramliana 2010b;Radhakrishnan et al., 2011;Britz et al., 2013;Ng & Conway, 2013;Rayamajhi et al., 2016). ...
... Of the total twenty three recognized species of Pseudolaguvia, about half (9 species) are confined to Brahmaputra River drainages in northeastern India and Rangapani Khal, Bangladesh (Ng, 2009;Ng & Tamang, 2012;Tamang & Sinha, 2014): P. foveolata, P. ferula, P. viriosa, P. muricata, P. magna, P. jiyaensis, P. ribeiroi, P. shawi, and P. ferruginea; seven species P. kapuri, P. inornata, P. flavida, P. virgulata, P. assula, P. nepalensis and P. flavipinna from the Ganga drainage system (Tamang & Sinha, 2014;Rayamajhi et al., 2016;Bhakat, 2019); two species each: P. nubila from the Kaladan River, and P. fucosa from the Karnaphuli River drainage, Mizoram (Ng et al., 2016); P. austrina from Bharathapuzha River and P. lapillicola from Subramanya and Kumaradhara River in peninsular India (Britz et al., 2013); and P. tenebricosa and P. tuberculata from the Sittang and Irrawaddy river systems, Myanmar (Britz, 2003); and lastly, one species P. spicula from the Surma-Meghna river drainage in northeast India and Bangladesh (Ng & Lalramliana, 2010b). ...
Pseudolaguvia moinensis, a new benthic miniature Asian catfish (Teleostei: Sisoridae) from Arunachal Pradesh, north-eastern India
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A new species of miniature sisorid catfish is described, from the upper Brahmaputra river drainage in northeastern India. The new species is distinguished from all its congeners except P. ferruginea and P. focusa by having an elongate light brown to cream marks either side on ventro-lateral margin just above anus. Further, distinguished from its congeners by the following combination of characters: presence of a W-shaped dark brown band on caudal fin, thoracic adhesive apparatus extending closer to pelvic-fin base, smooth anterior margin of dorsal spine, a narrow V-shaped light brown to cream bands on side of the body, dorsal-spine length (10.7-14.7% SL), dorsal-fin base length (10.7-14.2% SL), pectoral-fin spine length (14.0-21.1% SL), pelvic-fin length (13.5-16.6% SL), caudal peduncle length (14.4-18.2% SL) and depth (7.8-9.9% SL), total vertebrae (30-31), caudal fin with a complete medial hyaline bands towards its anterior end, reaching outer margin of each lobe. Other combination of characters differentiating the new species from its congeners are provided in the respective diagnoses.
View
... Pseudolaguvia has been demonstrated by Ng (2006b) and Jiang et al. (2011) to be more closely related to erethistins (a group also including Ayarnangra, Caelatoglanis, Conta, Erethistes, Erethistoides and Hara) than to Glyptothorax. Sixteen species of Pseudolaguvia are considered valid (Ng & Tamang, 2012): P. ribeiroi (Hora, 1921), P. shawi (Hora, 1921), P. tuberculata (Prashad & Mukerji, 1929), P. kapuri (Tilak & Husain, 1975), P. tenebricosa (Britz & Ferraris, 2003), P. foveolata (Ng, 2005a), P. inornata (Ng, 2005b), P. muricata (Ng, 2005b), P. ferula (Ng, 2006a), P. ferruginea (Ng, 2009), P. flavida (Ng, 2009), P. virgulata (Ng & Lalramliana, 2010a), P. spicula (Ng & Lalramliana, 2010b), P. austrina (Radhakrishnan et al., 2011), P. viriosa (Ng & Tamang, 2012) and P. lapillicola (Britz et al., 2013). ...
... In addition to P. muricata and P. shawi, two other species of Pseudolaguvia are known from the Surma-Meghna River system (Ng & Lalramliana, 2010b): P. spicula and P. virgulata. Pseudolaguvia nubila differs from both these species by the characters outlined in the diagnosis, and from P. inornata (a species known only from the Feni River drainage in Bangladesh) in having a mottled brown body without a pale mid-dorsal stripe and with yellowish bands (vs. ...
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... Members of the south Asian sisorid catfish genus Pseudolaguvia are small, cryptically-colored fishes found throughout hill streams and larger rivers of the Ganges and Brahmaputra drainages, distributed from Nepal in the west, to north and northeast India, the Bharatapuzha River, Western Ghats, in the state of Kerala, and the Kumaradhara River in the state of Karnataka, in the south, and the Brahmaputra drainages in Bangladesh and the Ayeyarwaddy and Sittang drainages in Myanmar in the east (Ng 2006a;Ng & Lalramliana 2010b;Radhakrishnan et al. 2010;Britz et al. 2013). Pseudolaguvia superficially resemble members of the sisorid genus Glyptothorax with which they share chiefly the presence of a thoracic adhesive apparatus consisting of longitudinal pleats of skin arranged in an elliptical or rhomboidal field, but differ by having a prominent postcoracoid process and a serrated anterior margin of the pectoral fin, both of which are absent in Glyptothorax. ...
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