Cyclas obtusalis Lamarck, 1818
Lamarck, 1818, Hist. Natur. Anim. sans Vert. 5: 559.

Cyclas obtusalis — Lamarck (1818), Nilsson (1822), Hanley (1843)
Pisidium obtusale — Jenyns (1832), Prime (1870), Burch (1975), Kuiper et al. (1989), ..., Clewing et al. (2020), Múrria et al. (2020), Saito et al. (2022), Clewing et al. (2022)
Pisum obtusale — Deshayes (1854)
Pisidium (Eupisidium) obtusale — Zhadin (1965), Korniushin (1998)
Pisidium (Cyclocalyx) obtusale — Clarke (1973), Falkner et al. (2001), Bank (2006), Bespalaya et al. (2017), Voode (2017)
Pisidium (Euglesa) obtusale — Korniushin & Glaubrecht (2002)
Cyclocalyx obtusalis — Kantor et al. (2010)
Euglesa (Cyclocalyx) obtusale — Vinarski & Kantor (2016)
Euglesa obtusalis — Príe et al. (2021), Bespalaya et al. (2022), Prié et al. (2023)
Euglesa (s.s.) obtusalis — Bespalaya et al. (2023)

Pisidium dubrueili Baudon, 1872
Baudon, 1872, unknown publication: 30, pl. 3, figs. 1-4.

Pisidium dubrueili — Baudon (1872)
Cyclocalyx (s.s.) dubrueili — Starobogatov et al. (2004)
Cyclocalyx dubrueili — Kantor et al. (2010)
Pisidium obtusale — He & Zhuang (2013)
Euglesa (Cyclocalyx) dubrueili — Vinarski & Kantor (2016)

Pisidium scholtzii Clessin, 1873
Clessin, 1873, Malak. Blatt. 20: 23, pl. 1, fig. 1.
Clessin in Westerlund, 1873, Fauna Moll. Terr. Fluv. Suec. Norv. Dan. (2): 540.
Clessin, 1874, Conch. Cab. 9(3): 18, pl. 2, figs. 1-3.
(new name for Pisidium obtusale Scholtz, 1853)

Pisidium scholtzii — Clessin (1873), Clessin (1874)
Pisidium (Gruppe Fossarina) scholtzii — Clessin (1877)
Corneocyclas (Cyclocalyx) scholtzi — Dall (1903)
Pisidium obtusale — Thiele (1934), IUCN (2011), Fauna Europaea (2012), He & Zhuang (2013)
Pisidium (Cyclocalyx) obtusale — Clarke (1973)
Pisidium (Eupisidium) obtusale — Korniushin (1998)
Cyclocalyx (s.s.) scholtzi — Starobogatov et al. (2004)
Cyclocalyx scholtzii — Kantor et al. (2010)
Euglesa (Cyclocalyx) scholtzii — Vinarski & Kantor (2016)

Pisidium obtusale magnificum Westerlund, 1873
Clessin in Westerlund, 1873, Fauna Moll. Terr. Fluv. Suec. Norv. Dan. (2): 547.
Clessin, 1874, Conch. Cab. 9(3): 27.
(intro'd as intra-sp. of Pisidium obtusale Pfeiffer, 1821)

Pisidium obtusale magnificum — Westerlund (1873)
Pisidium obtusale var. magnificum — Clessin (1874)
Cyclocalyx (s.s.) magnificus — Starobogatov et al. (2004)
Cyclocalyx magnificus — Kantor et al. (2010)
Pisidium obtusale — He & Zhuang (2013)
Euglesa (Cyclocalyx) magnifica — Vinarski & Kantor (2016)

Pisidium obtusale solidum Westerlund, 1873
Clessin in Westerlund, 1873, Fauna Moll. Terr. Fluv. Suec. Norv. Dan. (2): 548.
Clessin, 1874, Conch. Cab. 9(3): 28.
(intro'd as intra-sp. of Pisidium obtusale Pfeiffer, 1821)

Pisidium obtusale solidum — Westerlund (1873)
Pisidium obtusale var. solidum — Clessin (1874)
Cyclocalyx (s.s.) solidus — Starobogatov et al. (2004)
Cyclocalyx solidus — Kantor et al. (2010)
Pisidium obtusale — He & Zhuang (2013)
Euglesa (Cyclocalyx) solida — Vinarski & Kantor (2016)

Pisidium obtusale var. fragilis Westerlund, 1873
Clessin in Westerlund, 1873, Fauna Moll. Terr. Fluv. Suec. Norv. Dan. (2): 548.
Clessin, 1874, Conch. Cab. 9(3): 28.
(intro'd as intra-sp. of Cyclas obtusalis Lamarck, 1818)

Pisidium obtusale var. fragilis — Westerlund (1873)
Pisidium obtusale var. fragile — Clessin (1874)
Cyclocalyx (s.s.) fragilis — Starobogatov et al. (2004)
Cyclocalyx fragilis — Kantor et al. (2010)
Pisidium obtusale — He & Zhuang (2013)
Euglesa (Cyclocalyx) fragilis — Vinarski & Kantor (2016)

Pisidium scholtzi var. lapponicum Westerlund, 1873
Clessin in Westerlund, 1873, Fauna Moll. Terr. Fluv. Suec. Norv. Dan. (2): 540.
Clessin, 1874, Conch. Cab. 9(3): 19.
(intro'd as intra-sp. of Pisidium scholtzii Clessin, 1873)

Pisidium scholtzi var. lapponicum — Westerlund (1873)
Pisidium scholtzii var. lapponicum — Clessin (1874)
Pisidium obtusale — Burch (1975), He & Zhuang (2013)
Cyclocalyx (s.s.) lapponicus — Starobogatov et al. (2004)
Cyclocalyx lapponicus — Kantor et al. (2010)
Euglesa (Cyclocalyx) lapponica — Vinarski & Kantor (2016)

Galileja lapponica var. cor Starobogatov & Streletzkaja, 1967
Starobogatov & Streletzkaja, 1967, Trudy Zool. Inst. 42: 251.
(intro'd as intra-sp. of Pisidium scholtzi var. lapponicum Westerlund, 1873)

Galileja lapponica var. cor — Starobogatov & Streletzkaja (1967)
Cyclocalyx (s.s.) cor — Starobogatov et al. (2004)
Cyclocalyx cor — Kantor et al. (2010)
Pisidium obtusale — He & Zhuang (2013)
Euglesa (Cyclocalyx) cor — Vinarski & Kantor (2016)

Euglesa (Cyclocalyx) chaunensis Prozorova, 1988
Prozorova, 1988, Zool. Zhur. 67(10): 1578, fig. 2.

Euglesa (Cyclocalyx) chaunensis — Prozorova (1988), Vinarski & Kantor (2016)
Cyclocalyx (s.s.) chaunensis — Starobogatov et al. (2004)
Cyclocalyx chaunensis — Kantor et al. (2010)
Pisidium obtusale — He & Zhuang (2013)

Euglesa (Cyclocalyx) ovata Prozorova, 1988
Prozorova, 1988, Zool. Zhur. 67(10): 1579, fig. 3.

Euglesa (Cyclocalyx) ovata — Prozorova (1988), Vinarski & Kantor (2016)
Cyclocalyx (s.s.) ovatus — Starobogatov et al. (2004)
Cyclocalyx ovatus — Kantor et al. (2010)
Pisidium obtusale — He & Zhuang (2013)

Euglesa (Cyclocalyx) angarensis Slugina et al., 1994
Slugina & Starobogatov in Slugina et al., 1994, Ruthenica 4(2): 136.

Euglesa (Cyclocalyx) angarensis — Slugina et al. (1994), Vinarski & Kantor (2016)
Cyclocalyx (s.s.) angarensis — Starobogatov et al. (2004)
Cyclocalyx angarensis — Kantor et al. (2010)
Pisidium obtusale — He & Zhuang (2013)

Cyclas gibba Alder, 1831
Alder, 1831, Trans. Natur. Hist. Soc. Northumbld. Durham 1: 41.

Cyclas gibba — Alder (1831)
Pisidium pusillum — Jenyns (1832), Alder (1838)
Pisum obtusale — Deshayes (1854)
Pisidium obtusale — Prime (1870), Clessin (1874), He & Zhuang (2013)
Pisidium (Gruppe Fossarina) obtusale — Clessin (1877)

Pisidium obtusale Brown, 1831
Brown, 1831, Edinb. J. Nat. & Geogr. 4: 412.
(reference to Cyclas obtusalis Lamarck, 1818)

Pisidium obtusale — Brown (1831)
Cyclas gibba — Alder (1831)

Cyclas ovalis Nilsson, 1832
Nilsson, 1832, Trans. Cambridge Phil. Soc. 4: ??.
(homonym of Cyclas ovalis Férussac, 1807)

Cyclas ovalis — Nilsson (1832)
Pisidium obtusale — Prime (1870), He & Zhuang (2013)

Pisidium obtusale Scholtz, 1853
Scholtz, 1853, Land- und Wassermoll. Schlesiens: 142. [in part]
(reference to Cyclas obtusalis Lamarck, 1818; renamed Pisidium scholtzii Clessin, 1873)

Pisidium obtusale — Scholtz (1853)
Pisidium scholtzii — Clessin (1874)

Pisidium obtusalastrum Woodward, 1921
Woodward, 1921, unknown publication: ??.

Pisidium obtusalastrum — Woodward (1921)
Pisidium obtusale — IUCN (2011), Fauna Europaea (2012)

Pisidium obtusale solidum Kantor et al., 2010
Kantor et al., 2010, Cat. Contin. Moll. Russia: 306.
(error for Pisidium obtusale var. fragilis Westerlund, 1873)

Pisidium obtusale solidum — Kantor et al. (2010)

Taxonomic History (since 1900)

Corneocyclas (Cyclocalyx) scholtzi — Dall (1903)
Pisidium obtusalastrum — Woodward (1921)
Pisidium obtusale — Thiele (1934), Burch (1975), Kuiper et al. (1989), Korniushin et al. (2001), ..., Clewing et al. (2020), Múrria et al. (2020), Saito et al. (2022), Clewing et al. (2022)
Pisidium (Eupisidium) obtusale — Zhadin (1965), Korniushin (1998)
Galileja lapponica var. cor — Starobogatov & Streletzkaja (1967)
Pisidium (Cyclocalyx) obtusale — Clarke (1973), Falkner et al. (2001), Bank (2006), Bespalaya et al. (2017), Voode (2017)
Euglesa (Cyclocalyx) chaunensis — Prozorova (1988), Vinarski & Kantor (2016)
Euglesa (Cyclocalyx) ovata — Prozorova (1988), Vinarski & Kantor (2016)
Euglesa (Cyclocalyx) angarensis — Slugina et al. (1994), Vinarski & Kantor (2016)
Pisidium (Euglesa) obtusale — Korniushin & Glaubrecht (2002)
Cyclocalyx (s.s.) dubrueili — Starobogatov et al. (2004)
Cyclocalyx (s.s.) scholtzi — Starobogatov et al. (2004)
Cyclocalyx (s.s.) magnificus — Starobogatov et al. (2004)
Cyclocalyx (s.s.) solidus — Starobogatov et al. (2004)
Cyclocalyx (s.s.) fragilis — Starobogatov et al. (2004)
Cyclocalyx (s.s.) lapponicus — Starobogatov et al. (2004)
Cyclocalyx (s.s.) cor — Starobogatov et al. (2004)
Cyclocalyx (s.s.) chaunensis — Starobogatov et al. (2004)
Cyclocalyx (s.s.) ovatus — Starobogatov et al. (2004)
Cyclocalyx (s.s.) angarensis — Starobogatov et al. (2004)
Cyclocalyx obtusalis — Kantor et al. (2010)
Cyclocalyx dubrueili — Kantor et al. (2010)
Cyclocalyx scholtzii — Kantor et al. (2010)
Cyclocalyx magnificus — Kantor et al. (2010)
Cyclocalyx solidus — Kantor et al. (2010)
Cyclocalyx fragilis — Kantor et al. (2010)
Cyclocalyx lapponicus — Kantor et al. (2010)
Cyclocalyx cor — Kantor et al. (2010)
Cyclocalyx chaunensis — Kantor et al. (2010)
Cyclocalyx ovatus — Kantor et al. (2010)
Cyclocalyx angarensis — Kantor et al. (2010)
Pisidium obtusale solidum — Kantor et al. (2010)
Euglesa (Cyclocalyx) obtusale — Vinarski & Kantor (2016)
Euglesa (Cyclocalyx) dubrueili — Vinarski & Kantor (2016)
Euglesa (Cyclocalyx) scholtzii — Vinarski & Kantor (2016)
Euglesa (Cyclocalyx) magnifica — Vinarski & Kantor (2016)
Euglesa (Cyclocalyx) solida — Vinarski & Kantor (2016)
Euglesa (Cyclocalyx) fragilis — Vinarski & Kantor (2016)
Euglesa (Cyclocalyx) lapponica — Vinarski & Kantor (2016)
Euglesa (Cyclocalyx) cor — Vinarski & Kantor (2016)
Euglesa obtusalis — Príe et al. (2021), Bespalaya et al. (2022), Prié et al. (2023)
Euglesa (s.s.) obtusalis — Bespalaya et al. (2023)