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. 2022 Jan 27;12:1518. doi: 10.1038/s41598-022-05257-0

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Shells of Parreysia and Balwantia species from the Indian Subcontinent. (a) P. keralaensis sp. nov., Periyar River, Aluva, Kerala, India (holotype FBRC ZSI 1007-a/RCB2). (b) P. keralaensis sp. nov., the type locality (museum lot FBRC ZSI 1007; paratype RCB3). (c) P. corrugata (Müller, 1774), brook at fish ponds, Hetauda, Ganges Basin, Narayani Zone, Central Region, Nepal (specimen SMF 348829/16.02). (d) P. corrugata (Müller, 1774). Krishna River, Nagarjuna Sagar, Telangana, India (museum lot FBRC ZSI 1224; specimen RPf1). (e) P. nagpoorensis (Lea, 1860), Ramganga River near Moradabad, Ganges Basin, Uttar Pradesh, India (= Unio pinax Benson, 1862: syntype UMZC I.105035.B²⁴¹). (f) P. nagpoorensis (Lea, 1860), Krishna River, Nagarjuna Sagar, Telangana, India (museum lot FBRC ZSI 1224; specimen RPf2). (g) P. rajahensis (Lea, 1841). Rajah’s Tank, India (holotype NMNH 84638). (h) B. soleniformis (Benson, 1836). Brahmaputra River, India (specimen NMNH 127246). Scale bar = 20 mm [a-e, g]; scale bar = 25 mm [f]; scale bar = 30 mm [h]. Photos: N. V. Subba Rao and R. Pasupuleti [a, b, d, f], S. Hof [c], K. Webb [e], and NMNH collection database under a CC0 1.0 license [g, h].