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Journal of Threatened Taxa The Journal of Threatened Taxa (JoTT) is dedicated to building evidence for conservaton globally by publishing peer-reviewed artcles OPEN ACCESS online every month at a reasonably rapid rate at www.threatenedtaxa.org. All artcles published in JoTT are registered under Creatve Commons Atributon 4.0 Internatonal License unless otherwise mentoned. JoTT allows unrestricted use, reproducton, and distributon of artcles in any medium by providing adequate credit to the author(s) and the source of publicaton. Journal of Threatened Taxa Building evidence for conservaton globally www.threatenedtaxa.org ISSN 0974-7907 (Online) | ISSN 0974-7893 (Print) Communication Aborichthys barapensis, a new species of river loach (Cypriniformes: Nemacheilidae) from Arunachal Pradesh, the eastern Himalaya, India P. Nanda & L. Tamang 26 June 2021 | Vol. 13 | No. 7 | Pages: 18800–18808 DOI: 10.11609/jot.5989.13.7.18800-18808 For Focus, Scope, Aims, and Policies, visit htps://threatenedtaxa.org/index.php/JoTT/aims_scope For Artcle Submission Guidelines, visit htps://threatenedtaxa.org/index.php/JoTT/about/submissions For Policies against Scientfc Misconduct, visit htps://threatenedtaxa.org/index.php/JoTT/policies_various For reprints, contact <[email protected]> The opinions expressed by the authors do not refect the views of the Journal of Threatened Taxa, Wildlife Informaton Liaison Development Society, Zoo Outreach Organizaton, or any of the partners. The journal, the publisher, the host, and the part- Publisher & Host ners are not responsible for the accuracy of the politcal boundaries shown in the maps by the authors. Threatened Taxa Journal of Threatened Taxa | www.threatenedtaxa.org | 26 June 2021 | 13(7): 18800–18808 ISSN 0974-7907 (Online) | ISSN 0974-7893 (Print) OPEN ACCESS htps://doi.org/10.11609/jot.5989.13.7.18800-18808 #5989 | Received 13 April 2020 | Final received 27 June 2020 | Finally accepted 10 June 2021 COMMUNICATION Aborichthys barapensis, a new species of river loach (Cypriniformes: Nemacheilidae) from Arunachal Pradesh, the eastern Himalaya, India P. Nanda 1 & L. Tamang 2 1 Department of Zoology, Dera Natung Govt College, Itanagar, Arunachal Pradesh 791113, India. 2 Department of Zoology, Rajiv Gandhi University, Rono Hills, Doimukh, Itanagar, Arunachal Pradesh, 791112, India. 1 [email protected], 2 [email protected] (corresponding author) Abstract: 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 distnguished 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 distnguished from its congeners by the following combinaton of characters: body with 24–26 oblique bars along the fank; interspace narrower than bars on body; moderately rounded caudal fn with fve distnct black to brown cross bars; vent closer to the caudal-fn base (44.1–45.1 % standard length) than to snout tp. Keywords: Barap Stream, northeastern India, upper Brahmaputra River basin. ZooBank: urn:lsid:zoobank.org:pub:37F13A6D-EB10-4529-BF0C-A88A1F57D225 Editor: Anonymity requested. Date of publicaton: 26 June 2021 (online & print) Citaton: Nanda, P. & L. Tamang (2021). Aborichthys barapensis, a new species of river loach (Cypriniformes: Nemacheilidae) from Arunachal Pradesh, the eastern Himalaya, India. Journal of Threatened Taxa 13(7): 18800–18808. htps://doi.org/10.11609/jot.5989.13.7.18800-18808 Copyright: © Nanda & Tamang 2021. Creatve Commons Atributon 4.0 Internatonal License. JoTT allows unrestricted use, reproducton, and distributon of this artcle in any medium by providing adequate credit to the author(s) and the source of publicaton. Funding: The study was conducted without the support of funding agency. Competng interests: The authors declare no competng interests. Author details: Prasanta Nanda is zoologist in Department of Zoology, Dera Natung Govt College, Itanagar. He is working in the area of fsh biology of eastern Himalaya. Lakpa Tamang is an amateur naturalist who is interested in freshwater fsh taxonomy and working as fsh museum atendant in the Department of Zoology, Rajiv Gandhi University Museum of Fishes (RGUMF) based at Ronohills, Doimukh, Itanagar, Arunachal Pradesh. Author contributons: Both authors have equally contributed in designing, data recording and analysis, interpretaton, drafing of manuscripts, critcal review and revisions. Acknowledgements: We are grateful to Dr. N.T. Rikam, Principal, DNGC, Itanagar for providing laboratory facilites. We are also thankful to Mr. Nali K. Rangsong inhabitant of Lazu Village in helping in collecton of fsh. 18800 Aborichthys barapensis sp. nov. Nanda & Tamang J TT INTRODUCTION most part of the Arunachal Pradesh bordering Myanmar, we came across two adult specimens of Aborichthys. Members of the genus Aborichthys belonging to Later, examinaton revealed that it belonged to an family Nemacheilidae, is an elongate and slender bodied unnamed species of Aborichthys, which is described botom dwelling freshwater loach, that inhabits fast herein. fowing water of mountain rivers, streams, drainages of Ganga-Brahmaputra River, and is endemic to the eastern Himalaya. They are characterized by having MATERIAL AND METHODS vent situated close behind pectoral girdle, dorsal fn at vertcal originated slightly behind pelvic fn-origin; Sampling of fshes was done by using caste net narrow oblique bars on body; a black ocellus at upper with (2 m diameter and 7 mm meshes) in a small and extremity of caudal-fn base (but here absent), and shallow stream (depth ca. 10–30 cm), locally known as rounded or truncate caudal fn marked with concentric ‘Barap’ (26.898 N & 95.560 E, 1,020 m). The collected rings or irregular black patches, and all fns considerably specimens were freshly preserved in 10 % formaldehyde separated (Chaudhuri 1913; Kosygin 2019; Shangningam in the beginning to hold body coloraton, and then 2019). So far, nine species of Aborichthys are recognized as transferred to 70 % ethanol afer notng down its color. valid, whose diversity is mostly confned to Brahmaputra Measurement was made point to point with digital River basins in Arunachal Pradesh, northeastern India, caliper nearest to 0.1 mm. Counts and measurements and its distributon extends to Bhutan and Putao in were made on the lef side of specimens following Myanmar (Chaudhuri 1913, 1919; Hora 1925; Talwar & Keskar et al. (2015) except self-explanatory characters, Jhingran 1991; Shangningam et al. 2019). i.e., distances from: dorsal to caudal base, pectoral to The frst species Aborichthys boutanensis (Grifth & pelvic, pectoral to anal, pectoral to vent, pelvic to anal, McClelland, 1842) previously named Cobits boutanensis pelvic to vent, vent to anal, vent to caudal-fn base, anal known from the neighboring country Bhutan, when the to caudal base, anal-fn tp to caudal-fn base, vent to genus was not established. Later, Thoni & Hart (2015) anal distance, vent to pelvic distance, mouth length, considered it to be a member of Aborichthys. The genus mouth width, length of medial, lateral and maxillary was frst erected by Chaudhuri (1913) assigning A. barbels, caudal peduncle length/caudal peduncle kempi as the type species collected by Mr. S.W. Kemp depth, and mouth length/mouth width. Mouth width from Sirpo and Egar stream near Rotung and Renging was measured from posterior extremity of one corner village, Arunachal Pradesh in the east and has since to another and length medially from anterior margin of remained monotypic untl Hora (1921) described A. upper lip to level of posterior margin of lower lip. elongatus from the Riang River (Brahmaputra Basin), Subunits of head are expressed as proportons of Darjeeling (West Bengal) in the west. Thereafer, Hora lateral head length. Fin rays, cephalic lateralis system, (1925) further contributed another species Aborichthys and lateral line pores were counted under a stereo-zoom garoensis from Tura, Garo Hills, Assam (now Meghalaya) transmited light microscope (Magnus MS 24) following in the southwest, followed by Barman (1984) who Kotelat (1990) except an additonal: nasal pores (close added Aborichthys tkaderi from Namdapha Wildlife to nare), antero-nasal pores (scatered pores in front Sanctuary, Changlang District in the southeastern part of nares), pre-nasal pores (two pores situated each of Arunachal Pradesh. Over the last one decade, six side between nare and outer rostral barbel base), more sympatric species have been described from the supramaxillary pores (running along base of outer upper Brahmaputra River basins in Arunachal Pradesh, rostral barbel to posterior margin of cheek; Figure 1b). viz., Aborichthys waikhomi (Kosygin, 2012) from Bulbulia Lateral line sensory pores of three paterns – single, Stream near Bulbulia, a tributary of Noa-Dihing River, double (closely set), or triple (triangular and closely set), Namdapha, Changlang District in the east; A. kailasi and counted each pore as one (Figure 2). Three forms of A. pangensis (Shangningam et al., 2019) from Pange oblique bars along fank (regular, bifurcated or fused). River, Ziro, Lower Subansiri District in the west; and A. Bifurcated bars – those single bars bifurcate at the top iphipaniensis (Kosygin et al., 2019)
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