MUSSELpdb
Taxonomy
Species & Genus Richness of
freshwater mussels
by Taxonomy
Species & Genus Richness of
freshwater bivalves
by Family
Geography
Species Richness & Endemism of
freshwater mussels
by Geography
Data last updated
Thu 22 January 2026
Bivalvia | Unionida | Unionoidea | Unionidae | Parreysiinae | Lamellidentini | Trapezidens
species Trapezidens scutum (Sowerby, 1868): synonymy
9 specimens + 6 Genbank vouchers
Synonymy
Unio scutum Sowerby, 1868
‘Benson’ Sowerby, 1868. Conch. Icon. 16: pl. 94, sp. 510.
Type(s): HOLOTYPE (MONOTYPY) BMNH_1907-10-28-239, Tenasserim.
Lamellidens (s.s.) scutum — Simpson (1900), Simpson (1914)
Lamellidens (s.s.) marginalis var. scutum — Preston (1912)
Lamellidens (s.s.) marginalis scutum — Preston (1915)
Lamellidens scutum — Prashad (1922), Subba Rao (1989), Graf & Cummings (2007), Bogan (2010), IUCN (2014), Zieritz et al. (2018)
Lamellidens generosus — Haas (1969)
Trapezidens scutum — Bolotov et al. (2017), 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 marginalis var. zonata Hanley & Theobald, 1872
Deshayes, 1832. Enc. Méth. 2 (Deuxième partie): 587 [as ‘marginalis’].
Hanley & Theobald, 1872. Conch. Indica (3): 20, pl. 44, fig. 2.
(intro'd as intra-sp. of Unio marginalis Lamarck, 1819)
Lamellidens (s.s.) marginalis var. zonatus — Preston (1912)
Lamellidens (s.s.) marginalis — Simpson (1914)
Lamellidens (s.s.) marginalis var. zonata — Preston (1915)
Lamellidens scutum — Prashad (1922), Subba Rao (1989)
Taxonomic History (since 1900)
Lamellidens (s.s.) scutum — Simpson (1900), Simpson (1914)
Lamellidens (s.s.) marginalis var. scutum — Preston (1912)
Lamellidens (s.s.) marginalis var. zonatus — Preston (1912)
Lamellidens (s.s.) marginalis — Simpson (1914)
Lamellidens (s.s.) marginalis var. zonata — Preston (1915)
Lamellidens (s.s.) marginalis scutum — Preston (1915)
Lamellidens scutum — Prashad (1922), Subba Rao (1989), Graf & Cummings (2007), Bogan (2010), IUCN (2014), Zieritz et al. (2018)
Lamellidens generosus — Haas (1969)
Trapezidens scutum — Bolotov et al. (2017), 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)
