Pera henslowiana Jenyns, 1832
‘Leach’ of Authors.
Jenyns, 1832, Trans. Cambridge Phil. Soc. 4: 308.
Hanley, 1843, Illustr. Descr. Cat. Rec. Bivalve Shells: 91.
Leach, 1852, Syn. Moll. Gr. Brit.: 291 [as ‘Pera henslowiana’].
Prime, 1870, Amer. J. Conch. 5: 169.
Clessin, 1874, Conch. Cab. 9(3): 13.
Clessin, 1874, Bull. Soc. Vaud. Sci. Nat. 13: 149 [as ‘Pisidium henslowianum’].
Servain, 1882, Hist. Moll. Acéph. Francfort: 19 [as ‘Pisidium henslowianum’].
Prime, 1895, Cat. Corbiculadae: 60 [as ‘Pisidium henslowianum’].
Dall, 1903, Trans. Wagner Free Inst. 3(6): 1463.
Thiele, 1934, Handb. Syst. Weichtierk. 3: 853 [1297].
Kantor et al., 2010, Cat. Contin. Moll. Russia: 308 [as ‘Tellina henslowiana’].
(error for Tellina henslowana Sheppard, 1825)

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 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 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 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 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 parvulum Westerlund, 1873
Clessin in Westerlund, 1873, Fauna Moll. Terr. Fluv. Suec. Norv. Dan. (2): 553.
Clessin, 1874, Conch. Cab. 9(3): 17, pl. 1, figs. 17-21.

Pisidium parvulum var. martensi Westerlund, 1873
Clessin in Westerlund, 1873, Fauna Moll. Terr. Fluv. Suec. Norv. Dan. (2): 533.
Clessin, 1874, Conch. Cab. 9(3): 18, pl. 20-21.
(intro'd as intra-sp. of Pisidium parvulum Westerlund, 1873)

Pisidium fossarinum Westerlund, 1873
Clessin in Westerlund, 1873, Fauna Moll. Terr. Fluv. Suec. Norv. Dan. (2): 544.
Clessin, 1874, Conch. Cab. 9(3): 32, pl. 3, figs. 15-20.

Pisidium ibericum Clessin, 1873
Clessin, 1873, Malak. Blatt. 20: 29, fig. 4.
Clessin, 1874, Conch. Cab. 9(3): 36, pl. 4, figs. 1-3.

Pisidium bartolomaeum Clessin, 1873
Clessin, 1873, Corrspbl. d. zool.-mineral. Ver. Regensburg: ??.
Clessin, 1874, Conch. Cab. 9(3): 31, pl. 3, figs. 12-14.

Pisidium globulare Westerlund, 1873
Clessin in Westerlund, 1873, Fauna Moll. Terr. Fluv. Suec. Norv. Dan. (2): 532.
Clessin, 1874, Conch. Cab. 9(3): 24, pl. 2, figs. 16-18.

Pisidium henslowanum suecicum Westerlund, 1873
Clessin in Westerlund, 1873, Fauna Moll. Terr. Fluv. Suec. Norv. Dan. (2): 536.
Clessin, 1874, Conch. Cab. 9(3): 15.
(intro'd as intra-sp. of Tellina henslowana Sheppard, 1825)

Pisidium milium var. alpestre Clessin, 1873
Clessin, 1873, Corrspbl. d. zool.-mineral. Ver. Regensburg: ??.
Clessin, 1874, Conch. Cab. 9(3): 21, pl. 2, fig. 16.
(intro'd as intra-sp. of Pisidium milium Held, 1836)

Pisidium rivulare Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 30, pl. 3, figs. 7-11.
Clessin, 1877, Deutsche Excurs. Moll. Fauna: 510, fig. 331.

Pisidium fossarinum var. acuminatum Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 33.
(intro'd as intra-sp. of Pisidium fossarinum Westerlund, 1873; homonym of Pisidium acuminatum Martens, 1874)

Pisidium moreanum Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 38, pl. 4, figs. 7-9.

Pisidium italicum Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 40, pl. 4, figs. 16-18.

Pisidium henslowianum [sic] var. pulchrum Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 15, pl. 1, fig. 9.
Clessin, 1877, Deutsche Excurs. Moll. Fauna: 508, fig. 329.
(intro'd as intra-sp. of Tellina henslowana Sheppard, 1825)

Pisidium henslowianum [sic] var. solidum Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 15.
Clessin, 1877, Deutsche Excurs. Moll. Fauna: 509.
(intro'd as intra-sp. of Tellina henslowana Sheppard, 1825; homonym of Pisidium obtusale solidum Westerlund, 1873)

Pisidium henslowianum [sic] var. elongatum Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 15.
(intro'd as intra-sp. of Tellina henslowana Sheppard, 1825)

Pisidium heldreichi Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 38, pl. 4, figs. 10-12.

Pisidium hispanicum Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 37, pl. 4, figs. 4-6.

Pisidium fossarinum var. obtusum Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 33.
Clessin, 1877, Deutsche Excurs. Moll. Fauna: 514.
(intro'd as intra-sp. of Pisidium fossarinum Westerlund, 1873)

Pisidium fossarinum var. flavescens Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 33, pl. 3, fig. 19.
Clessin, 1877, Deutsche Excurs. Moll. Fauna: 514.
(intro'd as intra-sp. of Pisidium fossarinum Westerlund, 1873)

Pisidium fossarinum var. areolatum Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 33, pl. 3, fig. 20.
Clessin, 1877, Deutsche Excurs. Moll. Fauna: 514.
(intro'd as intra-sp. of Pisidium fossarinum Westerlund, 1873)

Pisidium fossarinum var. modestum Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 34, pl. 3, fig. 18.
Clessin, 1877, Deutsche Excurs. Moll. Fauna: 515.
(intro'd as intra-sp. of Pisidium fossarinum Westerlund, 1873)

Pisidium fossarinum var. curtum Clessin, 1874
Clessin, 1874, Conch. Cab. 9(3): 34.
Clessin, 1877, Deutsche Excurs. Moll. Fauna: 515.
(intro'd as intra-sp. of Pisidium fossarinum Westerlund, 1873)

Pisidium rivulare var. major Clessin, 1877
Clessin, 1874, Conch. Cab. 9(3): 31.
Clessin, 1877, Deutsche Excurs. Moll. Fauna: 512.
(intro'd as intra-sp. of Pisidium rivulare Clessin, 1874)

Pisidium amnicum Müller
+ Cyclas palustris Draparnaud, 1806
+ Cyclas obliqua Lamarck, 1818

Pisidium bartolomaeum Clessin

Pisidium fossarinum Clessin
+ Pisidium fontinale Pfeiffer, 1821
+ Pisidium pulchellum Jenyns, 1832

Pisidium globulare Clessin

Pisidium henslowianum [sic] Sheppard
+ Cyclas appendiculata Turton, 1831

Pisidium henslowianum [sic] var. elongatum Clessin

Pisidium henslowianum [sic] var. pulchrum Clessin

Pisidium henslowianum [sic] var. solidum Clessin

Pisidium henslowianum [sic] var. suecicum Clessin. Westerlund

Pisidium intermedium Gassies
+ Pisidium planum Prime, 1870

Pisidium milium Held
+ Pisidium gassiesianum Gassies, 1849
+ Pisidium tetragonum Normand, 1854
+ Pisidium arcaeforme Malm, 1855

Pisidium obtusale C. Pfeiffer
+ Cyclas gibba Alder, 1831

Pisidium obtusale var. fragile Clessin

Pisidium obtusale var. magnificum Clessin

Pisidium obtusale var. personatum Malm

Pisidium obtusale var. solidum Clessin

Pisidium pallidum Gassies

Pisidium parvulum Clessin

Pisidium parvulum var. martensi Clessin

Pisidium pulchellum Jenyns

Pisidium pusilla Gmelin
+ Cyclas fontinalis Draparnaud, 1806
+ Cyclas fontinalis Nilsson, 1822
+ Pisidium pusillum Jenyns, 1832

Pisidium rivulare Clessin

Pisidium roseum Scholtz

Pisidium scholtzii Clessin
+ Pisidium obtusale Scholtz, 1853

Pisidium scholtzii var. lapponicum Clessin

Pisidium subtruncatum Malm
+ Cyclas obtusalis Nilsson, 1822
+ Pisidium dupuyanum Normand, 1854

Pisidium subtruncatum var. turgidum Clessin

Pisidium supinum A. Schmidt
+ Pisidium fontinale Stein, 1850
+ Pisidium hesnlowianum var. inappendiculatum Moquin-Tandon, 1855
+ Pisidium conicum Baudon, 1857
+ Pisidium baudonii Clessin, 1873