Unio marginalis var. obesa Hanley & Theobald, 1872
Hanley & Theobald, 1872. Conch. Indica (3): 20, pl. 43, fig. 3.
(intro'd as intra-sp. of Unio marginalis Lamarck, 1819; homonym of Unio obesus Lea, 1831)
Type(s): HOLOTYPE BMNH_1907-12-30-46, River Iriwadi, Birmah.

Lamellidens (s.s.) marginalis var. obesus — Simpson (1900), Preston (1912)
Lamellidens (s.s.) marginalis var. obesa — Simpson (1914), Preston (1915)
Lamellidens jenkinsianus obesa — Prashad (1922), Subba Rao (1989), IUCN (2011)
Lamellidens testudinarius — Haas (1969)
Lamellidens jenkinsianus sub sp.obesa — Ramakrishna & Dey (2007)
Trapezidens obesa obesa — Bolotov et al. (2017), Huang et al. (2019)
Trapezidens dolichorhynchus — Konopleva et al. (2020)
Lamellidens generosus — Bolotov et al. (2022)

Unio dolichorhynchus Tapparone Canefri, 1889
Tapparone Canefri, 1889. Ann. Mus. Storia Nat. Genova 27: 348.

— Simpson (1900)
Lamellidens (s.s.) marginalis — Simpson (1914)
Lamellidens corrianus — Prashad (1922)
Lamellidens testudinarius — Haas (1969)
Trapezidens obesa obesa — Bolotov et al. (2017)
Trapezidens dolichorhynchus — Bolotov et al. (2018), Konopleva et al. (2020), Bolotov et al. (2020), Graf & Cummings (2021), Bolotov et al. (2022), Bolotov et al. (2022), Bolotov et al. (2022), Bolotov et al. (2024)

Unio gianellii Tapparone Canefri, 1889
Tapparone Canefri, 1889. Ann. Mus. Storia Nat. Genova 27: 353.

— Simpson (1900)
Lamellidens (s.s.) marginalis — Simpson (1914)
Lamellidens scutum — Prashad (1922)
Lamellidens testudinarius — Haas (1969)
Lamellidens savadiensis — Bolotov et al. (2017)
Trapezidens dolichorhynchus — Konopleva et al. (2020), Bolotov et al. (2022)

Unio protensus Tapparone Canefri, 1889
Tapparone Canefri, 1889. Ann. Mus. Storia Nat. Genova 27: 349.
(homonym of Unio protensus Lea, 1865; renamed Lamellidens canefrianus Simpson, 1900)

Lamellidens (s.s.) canefrianus — Simpson (1900), Preston (1915)
Lamellidens corrianus — Prashad (1922)
Lamellidens testudinarius — Haas (1969)
Trapezidens dolichorhynchus — Konopleva et al. (2020), Bolotov et al. (2022)

Unio gianelli var. degener Tapparone Canefri, 1889
Tapparone Canefri, 1889. Ann. Mus. Storia Nat. Genova 27: 354.
(intro'd as intra-sp. of Unio gianellii Tapparone Canefri, 1889)

Lamellidens scutum — Prashad (1922)
Trapezidens dolichorhynchus — Bolotov et al. (2022)

Unio protensus var. ellipticus Tapparone Canefri, 1889
Tapparone Canefri, 1889. Ann. Mus. Storia Nat. Genova 27: 350.
(homonym of Unio (Aximedia) elliptica Rafinesque, 1820; intro'd as intra-sp. of Unio protensus Tapparone Canefri, 1889)

Lamellidens corrianus — Prashad (1922)
Trapezidens dolichorhynchus — Konopleva et al. (2020), Bolotov et al. (2022)

Unio scutum var. humilior Martens, 1899
Martens, 1899. Arch. Naturg. 65: 45, pl. 5, fig. 1.
(intro'd as intra-sp. of Unio scutum Sowerby, 1868)
Type(s): TYPE ZMB_49639, Irawaddi, bei Yenangyoung.

Lamellidens (s.s.) scutum var. humilior — Simpson (1914)
Lamellidens (s.s.) marginalis var. humilior — Preston (1915)
Lamellidens scutum — Prashad (1922), Subba Rao (1989)
Lamellidens generosus — Haas (1969)
Trapezidens obesa obesa — Bolotov et al. (2017)
Trapezidens dolichorhynchus — Konopleva et al. (2020)

Lamellidens canefrianus Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 857, footnote.
Simpson, 1914. Descr. Cat. Naiades: 1176.
(new name for Unio protensus Tapparone Canefri, 1889)

Lamellidens (s.s.) canefrianus — Simpson (1900), Simpson (1914), Preston (1915)
Lamellidens corrianus — Prashad (1922)
Lamellidens testudinarius — Haas (1969)
Lamellidens savadiensis — Bolotov et al. (2017)
Trapezidens dolichorhynchus — Konopleva et al. (2020)

Lamellidens corrianus Whelan et al., 2011
‘Lea’ of Authors.
Whelan et al., 2011. MPE 61: 506.
Pfeiffer & Graf, 2015. Zool. J. Linn. Soc. 175(2): 310.
Bolotov et al., 2017. Sci. Repts. 7: Table S1 [as ‘Lamellidens corrianus sp. 1].
Konopleva et al., 2017. Systemat. Biodiv. 15(3): 207.
Pfeiffer et al., 2018. J. Moll. Studies 84(4): [3].
Pfeiffer et al., 2019. MPE 137: 117.
Lopes-Lima et al., 2020. MPE 146: Table 1.
(misidentified reference to Unio corrianus Lea, 1834)
Type(s): SEQUENCED SPECIMEN UMMZ_304642, Ayeryarwaddy River, mud bank on E side of river, Mandalay Division, Burma. 21.48187, 95.30501.

Trapezidens dolichorhynchus — Bolotov et al. (2022)

Unio marginalis Tapparone Canefri, 1889
‘Lamarck’ Tapparone Canefri, 1889. Ann. Mus. Storia Nat. Genova 27: 345.
(misidentified reference to Unio marginalis Lamarck, 1819)

Trapezidens dolichorhynchus — Bolotov et al. (2022)

Lamellidens canefrinus Prashad, 1922
‘Simpson’ Prashad, 1922. Rec. Ind. Mus. 24: 106.
(error for Lamellidens canefrianus Simpson, 1900)