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Data last updated
Mon 1 Dec 2025

Bivalvia | Unionoida | Unionoidea | Unionidae | Gonideinae | Contradentini

genus Lens Simpson, 1900: synonymy

13 Recent freshwater species (13 total species)

Synonymy

Lens Simpson, 1900

Simpson, 1900. Proc. U.S. Nat. Mus. 22: 831.
Simpson, 1914. Descr. Cat. Naiades: 1067.
(intro'd as sub-gen. of Physunio Simpson, 1900)
Type species: Unio eximius Lea, 1856 (orig. desig.) = Lens eximius

Contradens Haas, 1911

Haas, 1911. Conch. Cab. 9 (pt. 2, h. 44): pl. 18-22.
Haas, 1913. Nachr. Bl. Dtsch. Malak. Ges. 45: 35.
Haas, 1913. Conch. Cab. 9 (pt. 2, h. 48): 173.
Type species: Unio contradens Lea, 1838 (orig. desig.) = Lens contradens

Uniandra Haas, 1913

Haas, 1913. Conch. Cab. 9 (pt. 2, h. 47): 140.
(intro'd as sub-gen. of Ensidens Frierson, 1911)
Type species: Unio inaequalis Rochebrune, 1882 (orig. desig.) = Lens micropterus

Schizocleithrum Haas, 1913

Haas, 1911. Conch. Cab. 9 (pt. 2, h. 44): pl. 22.
Haas, 1913. Nachr. Bl. Dtsch. Malak. Ges. 45: 36.
Haas, 1914. Conch. Cab. 9 (pt. 2, h. 49): 202.
Type species: Unio pajakomboensis Bullen, 1906 (orig. desig.) = Lens contradens

Sprickia Modell, 1942

Modell, 1942. Arch. Moll. 74(5/6): 189.
Modell, 1964. Arch. Moll. 93: 114.
(intro'd as sub-gen. of Contradens Haas, 1911)
Type species: Unio verbecki Martens, 1897 (orig. desig.) = Lens contradens

Sprichia Vokes, 1980

‘Modell’ of Authors.
Vokes, 1980. Genera of the Bivalvia: 78.
Vaught, 1989. Class. Livinh Moll.: 122.
Millard, 2001. Class. Moll. (3): 1064.
(error for Sprickia Modell, 1942)
Type species: Unio verbecki Martens, 1897 = Lens contradens

Contortus Araujo et al., 2017

Araujo et al., 2017. Zool. J. Linn. Soc. 179(2): 280.
(error for Contradens Haas, 1911)
Type species: Unio contradens Lea, 1838 = Lens contradens

Taxonomic History (since 1900)

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

Nodularia (s.s.) — Simpson (1900), Simpson (1914)
Physunio (s.s.) — Simpson (1900), Preston (1912), Simpson (1914), Haas (1919), Haas (1924), Haas (1952), Haas (1969)
Physunio (sec. Lens) — Simpson (1900)
Dalliella — Simpson (1900)
Trapezoideus — Simpson (1900), Preston (1912), Simpson (1914), Preston (1915), Haas (1919), ... IUCN (2012), He & Zhuang (2013), Zieritz et al. (2018), Do et al. (2018), Pfeiffer et al. (2018)
Unio — Martens (1900), Bullen (1906), Preston (1912), Simpson (1914)
Unio (Nodularia) — Dautzenberg & Fischer (1905)
Ensidens (sec. Uniandra) — Haas (1913), Thiele (1934)
Ensidens (s.s.) — Haas (1913), Haas (1969)
Contradens — Haas (1913), Haas (1914), Ortmann (1917), Haas (1924), Thiele (1934), ... Ng et al. (2020), Graf & Cummings (2021), Bieler (2021), Smith (2021), Sahidin et al. (2021)
Physunio (Lens) — Simpson (1914), Haas (1969)
Pseudodon (sec. Bineurus) — Simpson (1914)
Hyriopsis (s.s.) — Simpson (1914)
Schizocleithrum — Haas (1914)
Pseudodon (Bineurus) — Haas (1920), Haas (1969)
Ensidens (Uniandra) — Prashad (1932), Haas (1952), Haas (1969), Haas (1969)
Contradens (s.s.) — Modell (1942), Haas (1969)
Contradens (Sprickia) — Modell (1942), Haas (1969)
Physunio — van Benthem Jutting (1953), Brandt (1974), Graf & Cummings (2007), Sri-aroon et al. (2007), Bogan (2010), ... Konopleva et al. (2019), Ng et al. (2020), Graf & Cummings (2021), Wu et al. (2021), Sahidin et al. (2021)
Ensidens — F.R. Woodward (1969)
Harmandia — Brandt (1974), Graf & Cummings (2007), Bogan (2010), IUCN (2012), Zieritz et al. (2018)
Uniandra — Brandt (1974), Graf (2002), Sri-aroon et al. (2007), Hoeh et al. (2009), Bogan (2010), IUCN (2012), Bogan & Do (2014), Zieritz et al. (2015), Sahidin et al. (2021)
Contortus [sic] — Araujo et al. (2017)
Lens — Pfeiffer et al. (2021), Jeratthitikul et al. (2021), Zieritz et al. (2021), Jeratthitikul et al. (2021), Zieritz et al. (2021), ... Dai et al. (2024), Zhang et al. (2024), Dai et al. (2025), Dai et al. (2025), Chen et al. (2025)

 
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