Unio testudinarius Spengler, 1793
Spengler, 1793. Skr. Naturhist. Selsk. 3: 65, no. 30.

Lamellidens (s.s.) marginalis — Simpson (1900), Preston (1912), Simpson (1914), Preston (1915)
Lamellidens testudinarius — Haas (1969)
Lamellidens marginalis — Bogan (2010)
— Bolotov et al. (2022)

Unio truncatus Spengler, 1793
Spengler, 1793. Skr. Naturhist. Selsk. 3: 65, no. 31.

— Simpson (1900), Bolotov et al. (2022)
Lamellidens (s.s.) marginalis — Preston (1912), Simpson (1914), Preston (1915)
Lamellidens testudinarius — Haas (1969)

Unio anodontina Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 80, sp. 47.
(renamed Anadontina turgida Schlüter, 1838)
Type(s): HOLOTYPE GENEVAMUSEUM_XXX, [locality unknown].

Lamellidens (s.s.) marginalis — Simpson (1900), Preston (1912), Simpson (1914), Preston (1915)
Lamellidens testudinarius — Haas (1969)

Unio marginalis Lamarck, 1819
Bruguière, 1797. Encycl. Méth. 2: pl. 247, figs. 1a-c [as Unio sp.].
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 79, sp. 41.
(renamed Unio marginalis var. typica Hanley & Theobald, 1872)
Type(s): POSSIBLE SYNTYPE MNHN_MPL_0031, Habite au Bengale, dans les rizières [sic]... La variété [b] vient de l’ile de Ceylon....Mon cabinet. [Lives in Bengal, in rice [sic]... The [b] variety comes from the island of Ceylon...My cabinet. ].

Lamellidens (s.s.) marginalis — Simpson (1900), Preston (1912), Simpson (1914), Preston (1915)
Lamellidens marginalis — Ortmann (1912), Prashad (1919), Annandale & Prashad (1921), Prashad (1922), Thiele (1934), ... Pavan-Kumar et al. (2022), Wu et al. (2023), Imsong & Murali (2023), Wu et al. (2024), Wu et al. (2024)
Lamellidens testudinarius — Haas (1969)
Lamellidens aff. marginalis sp. 1 — Bolotov et al. (2017), Bolotov et al. (2017), Huang et al. (2019)
Lamellidens aff. marginalis sp. 2 — Bolotov et al. (2017), Bolotov et al. (2017), Huang et al. (2019)
Lamellidens aff. marginalis sp. 3 — Bolotov et al. (2017), Bolotov et al. (2017), Bolotov et al. (2018), Huang et al. (2019)
Lamellidens aff. marginalis sp. 4 — Bolotov et al. (2017), Bolotov et al. (2017), Huang et al. (2019)
Lamellidens aff. marginalis sp. 5 — Bolotov et al. (2017), Bolotov et al. (2017), Huang et al. (2019)
Lamellidens (marginalis-group) marginalis — Bolotov et al. (2022), Bolotov et al. (2024)

Symphynota bilineata Lea, 1831
Lea, 1831. Trans. Amer. Phil. Soc. 4 [O. 1]: 98, pl. 11, fig. 19.
Type(s): SYNTYPES ANSP_41876, River Hoogley [about 100 mi above Calcutta] Hindostan.

Lamellidens (s.s.) marginalis — Simpson (1900), Preston (1912), Simpson (1914), Preston (1915)
Lamellidens testudinarius — Haas (1969)
Lamellidens (marginalis-group) marginalis — Bolotov et al. (2022)

Anadontina turgida Schlüter, 1838
Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 32.
(new name for Unio anodontina Lamarck, 1819)

Unio evanescens Mousson, 1849
Mousson, 1849. Land-Süßw.-Moll. Java: 91, pl. 17 [10], fig. 2.

Lamellidens (s.s.) marginalis — Simpson (1900), Preston (1912), Simpson (1914), Preston (1915)
Lamellidens marginalis — van Benthem Jutting (1953)

Unio ligula Mousson, 1849
Mousson, 1849. Land-Süßw.-Moll. Java: 94.

— Simpson (1900), Simpson (1914), Haas (1969)
Lamellidens marginalis — van Benthem Jutting (1953)

Unio thwaitesii Lea, 1859
Lea, 1859. Proc. Acad. Nat. Sci. 11: 152 [as ‘thwaitsii’].
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 7]: 246 [64], pl. 37, fig. 125.
(correct name for Unio thwaitsii Lea, 1859)
Type(s): HOLOTYPE BMNH_1965179, Ceylon.

Lamellidens (s.s.) thwaitesii — Simpson (1900), Simpson (1914)
Lamellidens (s.s.) marginalis var. thwaitesi — Preston (1912)
Lamellidens (s.s.) marginalis thwaitesii — Preston (1915)
Lamellidens testudinarius — Haas (1969)
Lamellidens marginalis — Bieler (2021)
Lamellidens (marginalis-group) marginalis — Bolotov et al. (2022)

Unio thwaitsii Lea, 1859
Lea, 1859. Proc. Acad. Nat. Sci. 11: 152.
(incorrect original spelling of Unio thwaitesii Lea, 1859)

Lamellidens marginalis — Bieler (2021)

Unio marginalis var. cylindrica Hanley & Theobald, 1872
Hanley & Theobald, 1872. Conch. Indica (3): 20, pl. 44, fig. 1.
(homonym of Unio cylindricus Say, 1817; intro'd as intra-sp. of Unio marginalis Lamarck, 1819)
Type(s): UNKNOWN BMNH_429-06-1-1, Poonassa.

Lamellidens (s.s.) marginalis var. cylindricus — Simpson (1900), Simpson (1914)
Lamellidens (s.s.) marginalis var. cylindrica — Preston (1915)
Lamellidens testudinarius — Haas (1969)

Unio marginalis var. typica Hanley & Theobald, 1872
Hanley & Theobald, 1872. Conch. Indica (3): 20, pl. 43, fig. 2.
(intro'd as intra-sp. of Unio marginalis Lamarck, 1819; new name for Unio marginalis Lamarck, 1819)

Lamellidens marginalis var. hanleyi Simpson, 1900
Hanley & Theobald, 1872. Conch. Indica (3): 20, pl. 44, fig. 4 [as ‘Unio marginalis var. corriana’].
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 855.
Simpson, 1914. Descr. Cat. Naiades: 1169.
(intro'd as intra-sp. of Unio marginalis Lamarck, 1819)

Lamellidens (s.s.) marginalis var. hanleyi — Simpson (1900), Simpson (1914), Preston (1915)
Lamellidens testudinarius — Haas (1969)

Unio anadontina Schlüter, 1838
‘Lam.’ Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 32.
(error for Unio anodontina Lamarck, 1819)

Unio marginata Swainson, 1840
‘Lamarck’ Swainson, 1840. Treat. Malacol.: 278.
(error for Unio marginalis Lamarck, 1819)

Unio anodontinus Küster, 1861
‘Lamarck’ Küster, 1861. Conchyl. Cab. 9(2): 240, pl. 80, fig. 5.
(reference to Unio anodontina Lamarck, 1819)

Unio corrianus Sowerby, 1868
‘Lea’ Sowerby, 1868. Conch. Icon. 16: pl. 77, sp. 401.
(misidentified reference to Unio corrianus Lea, 1834)

Lamellidens (s.s.) marginalis var. obesus — Simpson (1900), Preston (1912)
Lamellidens (s.s.) marginalis var. obesa — Simpson (1914), Preston (1915)

Unio consobrinus Hanley & Theobald, 1872
‘Lea’ Hanley & Theobald, 1872. Conch. Indica (3): 19, pl. 41, fig. 7.
(misidentified reference to Unio consobrinus Lea, 1860)

Lamellidens (s.s.) thwaitesii — Simpson (1900), Simpson (1914)
Lamellidens (s.s.) marginalis var. thwaitesi — Preston (1912)
Lamellidens (s.s.) marginalis thwaitesii — Preston (1915)

Unio thwaitesii Hanley & Theobald, 1872
‘Lea’ Hanley & Theobald, 1872. Conch. Indica (3): 20, pl. 43, fig. 1.
(reference to Unio thwaitesii Lea, 1859)

Lamellidens (s.s.) thwaitesii — Simpson (1900)
Lamellidens (s.s.) generosus — Simpson (1914)
Lamellidens (s.s.) marginalis thwaitesii — Preston (1915)

Unio marginalis var. corriana Hanley & Theobald, 1872
Hanley & Theobald, 1872. Conch. Indica (3): 20, pl. 44, fig. 4.
(misidentified reference to Unio corrianus Lea, 1834)

Lamellidens (s.s.) marginalis var. hanleyi — Simpson (1900), Simpson (1914), Preston (1915)

Lamellidens corrianus Lopes-Lima et al., 2021
Lopes-Lima et al., 2021. MPE 163: Table S1.
(misidentified reference to Unio corrianus Lea, 1834)

Lamellidens (corrianus-group) corrianus — Bolotov et al. (2024)