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MUSSELpdb

Taxonomy

Margaritiferidae

Species & Genus Richness by
Taxonomy

Geography

Central America

Species Richness & Endemism by
Geography

Data last updated
Mon 1 Dec 2025

Bivalvia | Unionoida | Unionoidea | Unionidae | Unioninae | Anodontini | Alasmidontina

genus Arcidens Simpson, 1900: synonymy

2 Recent freshwater species (3 total species)

Synonymy

Arcidens Simpson, 1900

Simpson, 1900. Proc. U.S. Nat. Mus. 22: 661.
Simpson, 1914. Descr. Cat. Naiades: 475.
Type species: Alasmodonta confragosa Say, 1829 (orig. desig.) = Arcidens confragosus

Arkansia Ortmann & Walker, 1912

Ortmann & Walker, 1912. Nautilus 25(9): 97.
Type species: Arkansia wheeleri Ortmann & Walker, 1912 (orig. desig.) = Arcidens wheeleri

Taxonomic History (since 1900)

The Taxonomic History lists the ways authors have classified the species currently assigned to Arcidens, since 1900.

Arcidens — Simpson (1900), Ortmann (1912), Simpson (1914), Utterback (1915), Frierson (1927), ... FMCS (2021), Whelan et al. (2023), Hopper et al. (2023), Perkins et al. (2025), FMCS (2025)
Unio (Margaritana) — Call (1900)
Arkansia — Ortmann & Walker (1912), Simpson (1914), Frierson (1927), Thiele (1934), Modell (1957), ... Howells et al. (1996), Turgeon et al. (1998), ITIS (2012), Haag (2012), Inoue et al. (2014)
Arcidens (Arkansia) — Clarke (1981), Graf & Cummings (2007)
Arcidens (s.s.) — Clarke (1981), Graf & Cummings (2007)
A. — Marshall et al. (2018)

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