Anodonta mutabilis Clessin, 1877
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 434.

Anodonta nilsoni Clessin, 1877
‘Küster’ Clessin, 1877. Deutsche Excurs. Moll. Fauna: 444.
‘Küster’ Locard, 1890. Contr. Faune Malacol. Franc. 14: 97 [53].
(error for Anodonta nilssonii Küster, 1842)

Anodonta pirvinalis Clessin, 1877
‘Nils’ Clessin, 1877. Deutsche Excurs. Moll. Fauna: 442, fig. 289.
(error for Anodonta piscinalis Nilsson, 1822)

Anodonta mutabilis var. lacustrina Clessin, 1877
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 444, fig. 291.
(intro'd as intra-sp. of Anodonta mutabilis Clessin, 1877)

Calyculina rykoltii var. angulata Clessin, 1877
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 497, fig. 322.
(intro'd as intra-sp. of Cyclas rykoltii Normand, 1844)

Musculium strictum Clessin, 1877
Clessin, 1877. Deutsche Excurs. Moll. Fauna: ??.
(misidentified reference to Cyclas stricta Normand, 1854)

Mytilus cellensis Menke, 1828
‘Gmelin’ of Authors.
Menke, 1828. Syn. Method. Moll.: 63.
Menke, 1830. Syn. Method. Moll.: 106.
Küster, 1839. Conchyl. Cab. 9(1): 16.
Mörch, 1853. Cat. Conch. Yoldi 2: 48.
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 438.
Drouët, 1881. Unionidae Russie: 22.
Bourguignat, 1882. Natural. Sicil. 2 (1): 20 [1].
Westerlund, 1890. Fauna Paläarct. Binnenconch. 2(7): 211.
Zhadin, 1938. Faune USSR Mollusques 4(1): 119.
Modell, 1945. Jena. Z. Med. Naturw. 78: 81.
(error for Mytilus zellensis Gmelin, 1791)

Pisidium bandonii Clessin, 1877
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 505.
(error for Pisidium baudonii Clessin, 1873)

Pisidium ovatum Clessin, 1877
Clessin, 1877. Conch. Cab. 9(3): 72, pl. 8, figs. 22-24.
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 517, fig. 334.

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 urinator Clessin, 1877
Clessin, 1874. Bull. Soc. Vaud. Sci. Nat. 13: 149. [nomen nudum]
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 70, pl. 8, 16-18.

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. 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 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. 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. 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 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 obtusale var. fragile Westerlund, 1873
Clessin in Westerlund, 1873. Fauna Moll. Terr. Fluv. Suec. Norv. Dan. (2): 548.
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 520.
(intro'd as intra-sp. of Pisidium obtusale Pfeiffer, 1821)

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)

Sphaerium dickinii Clessin, 1877
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 490, fig. 317.
Clessin, 1877. Conch. Cab. 9(3): 96, pl. 12, figs. 18-20.

Sphaerium oblongum Clessin, 1877
Clessin, 1877. Conch. Cab. 9(3): 83, pl. 9, figs. 25-27.
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 484.

Sphaerium sandbergeri Clessin, 1877
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 483, fig. 311.
Clessin, 1877. Conch. Cab. 9(3): 89, pl. 12, fig. 13-15.

Unio pseudolitoralis Clessin, 1877
Clessin, 1875. Verh. Ver. Naturgesch. Hamburg 2: 258 [as ‘pseudo-litoralis’]. [nomen nudum]
Clessin, 1877. Deutsche Excurs. Moll. Fauna: 469, text fig. 305 [as ‘pseudo-litoralis’].