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

Pisidium (Eupisidium) obtusale — Zhadin (1965), Korniushin (1998)
Pisidium (Cyclocalyx) obtusale — Clarke (1973), Falkner et al. (2001), Bank (2006), Voode (2017), Bespalaya et al. (2017)
Pisidium obtusale — Burch (1975), Kuiper et al. (1989), Korniushin et al. (2001), Taylor et al. (2007), Schultheiß et al. (2008), ... Múrria et al. (2020), Groh et al. (2020), Clewing et al. (2020), Saito et al. (2022), Clewing et al. (2022)
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)

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

Pisidium obtusale — He & Zhuang (2013)

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

Pisidium obtusale — He & Zhuang (2013)

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

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)

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)

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)

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)

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 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)

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

Pisidium obtusale — IUCN (2011), Fauna Europaea (2012)

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)

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.

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

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

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

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

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

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

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