| Indonaia corbis (Hanley, 1856) stat. rev. = Unio corbis Hanley (1856): 386, pl. 23, fig. 43; = Unio pachysoma Benson (1862): 186 [TL: Assam; syntypes UMZC I.103205.A and NHMUK 20150103, illustrated by Preece et al. (2022): fig. 107a-b]; = Trapezoideus dhanushori Annandale and Prashad (1921): 611, figs 30, 31a, b [TL: Dhanushori Stream at a distance of about a mile from Dimapur, Assam; holotype ZSI M11962/2, by original designation, illustrated here]; = Indonaia caerulea Imsong and Murali (2023): 32, fig. 1F, COI sequence No. OM076974 [identification error]; = Indonaia subclathrata Imsong and Murali (2023): 32, fig. 1E, COI sequence No. OM075118 [identification error] | Holotype NHMUK 1872.10.17.3, by monotypy (Hanley 1856, Preece et al. 2022); sequenced topotypes in FBRC ZSI (this study) | Assam (Hanley 1856) | Endemic to the Brahmaputra River basin, north-eastern India (Assam, Manipur, and Nagaland) |
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| Genus Pseudoscabies gen. nov. |
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| Pseudoscabies scobina (Hanley, 1856) gen. et comb. nov. = Unio scobina Hanley (1856): 382, pl. 23, fig. 40; = Unio radula Hanley (1856): 382, pl. 23, fig. 41 [unavailable name, primary homonym of U. radula Say, 1829; TL: Assam; possible syntype UMZC I.105130] (Preece et al. 2022); = Nodularia (Radiatula) lima Simpson (1900): 820 [replacement name for U. radula Hanley, 1856] | Whereabouts of the type unknown (Coan and Kabat 2012); sequenced topotypes in FBRC ZSI (this study) | Assam (Hanley 1856) | Endemic to the Brahmaputra River basin, north-eastern India (Assam and Manipur) (Annandale and Prashad 1921) |
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| Tribe Lamellidentini Modell, 1942 |
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| Genus Balwantia Prashad, 1919 |
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| Balwantia soleniformis (Benson, 1836) = Anodonta soleniformis Benson (1836): 750; = Margaron (Unio) bensonii Lea (1870): 57 [unnecessary replacement name for Anodonta soleniformis Benson, 1836] | Syntypes UMZC I.102275.A–B, illustrated by Preece et al. (2022): fig. 104b-e; sequenced topotypes in FBRC ZSI (this study) | The hills on the N.E. Frontier of Bengal (Silhet) (Sylhet Division, Upper Meghna Basin, north-eastern Bangladesh) (Benson 1836) | Endemic to the Brahmaputra, Upper Barak (Dhaleswari), and Upper Meghna basins, India and Bangladesh |
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| Genus Lamellidens Simpson, 1900 |
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| The marginalis -group |
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| Lamellidens friersoni (Simpson, 1914) = Unio velaris Sowerby, 1868 | Whereabouts of the type unknown (Coan and Kabat 2012); topotypes not available | Assam | Possible endemic to the Brahmaputra River basin, north-eastern India (Prashad 1932a) |
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| Lamellidens jenkinsianus (Benson, 1862) = Unio jenkinsianus Benson (1862): 185; = Parreysia (s.s.) daccaensis Preston (1912): 300 [TL: Dacca; holotype ZSI M6105/1, by original designation, illustrated by Bolotov et al. (2022a): fig. 3c] | Syntype UMZC I.103130, illustrated by Preece et al. (2022): fig. 105a; sequenced topotypes in FBRC ZSI (this study) | Fluvio Assamensi Berhampooter dicto (Brahmaputra River, Assam, India) (Benson 1862) | Ganges, Meghna, Brahmaputra, Godavari, Krishna, and Ambā basins, India and Bangladesh (Bolotov et al. 2022a); a few occurrences from Bhutan (Gittenberger et al. 2018) |
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| The corrianus -group |
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| Lamellidens nongyangensis Preston, 1912 = Lamellidens nongyangensis Preston (1912): 306; = Lamellidens narainporensis Preston (1912): 305 [TL: Narainpore Bhil, Murshidabad District, Bengal; holotype ZSI 5056/1, by original designation]; = Lamellidens marginalis Imsong and Murali (2023): 32, fig. 1D, COI sequence No. ON209524 [identification error] | Holotype ZSI 5068/1, by original designation, illustrated here; sequenced topotypes in RMBH (Bolotov et al. 2022a) | Nongyang Lake, south of Patkai (Lake of No Return, 27.2192°N, 96.1439°E, Irrawaddy Basin, Myanmar) (Preston 1912) | Ganges and Brahmaputra basins in India, with an isolated population in Lake of No Return, Irrawaddy Basin, Myanmar |
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| topotypes | | |
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| Tribe Parreysiini Henderson, 1935 |
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| Genus Assamnaia gen. nov. |
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| Assamnaia involuta (Hanley, 1856) gen. et comb. nov. = Unio involutus Hanley (1856): 385, pl. 23, fig. 19 | Holotype NHMUK 1968656; sequenced topotypes in FBRC ZSI (this study) | Assam (Hanley 1856) | Endemic to the Brahmaputra River basin in north-eastern India and to the Surma River in Bangladesh |
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| Genus Parreysia Conrad, 1853 |
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| The keralaensis -group |
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| Parreysia marcens (Benson, 1862) stat. rev. = Unio favidens var. marcens Benson (1862): 188; = Unio gowhattensis Theobald (1873): 208, pl. 17, fig. 4 [TL: Prope Gowhatti in Assam; whereabouts of the types unknown]; = Parreysia (Parreysia) annandalei Preston (1912): 302 [TL: Gowhatty; holotype ZSI 2490/1, by original designation, illustrated by Subba Rao (1989): figs 444, 445]; = Parreysia favidens var. assamensis Preston (1912): 299 [TL: Digong; holotype ZSI 2479/1, by original designation, and two paratypes ZSI 9996/2]; = Parreysia corrugata Imsong and Murali (2023): 32, fig. 1G, COI sequence No. OM074301 [identification error] | Two syntypes UMZC I.103165.A and UMZC I.103170, illustrated by Preece et al. (2022): fig. 109c-d; sequenced topotypes in FBRC ZSI (this study) | Berhampooter River, Assam (Benson 1862) | Endemic to the Brahmaputra River basin, north-eastern India |
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| Species group unattributed |
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| Parreysia smaragdites (Benson, 1862) stat. rev. = Unio smaragdites Benson (1862): 190; = Unio corrugatus var. fragilis Hanley and Theobald (1872): 21, pl. 45, fig. 4 [permanently invalid name, primary homonym of Unio (Leptodea) fragilis Rafinesque, 1820; TL: unknown; holotype NHMUK 1968651] (Coan and Kabat 2012, Graf and Cummings 2021) | Two syntypes UMZC I.103360.A–B, illustrated by Preece et al. (2022): fig. 111a–c; topotypes not available | Fluvio Berhampooter, regionis Assamensis (Benson 1862) | Possible endemic to the Brahmaputra River basin, north-eastern India |
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