| Page last updatedWed 1 October 2025
 | The Freshwater Mussels (Unionoida) of the World (and other less consequential bivalves)FM(U)otW(aolcb) is the web version of the MUSSEL Project Database. Follow the links to browse the data or use the custom Google search field. Either way, you win! 
					Search the database pages: 
 Publication Clessin (1873): summarypublication summary
 Complete CitationClessin. 1873. Beiträge zur Molluskenfauna der oberbayerischen Seen. Correspondenz-blatt des Zoologisch-mineralogischen Vereins in Regensburg.  Attributed Nominal Species| Pisidium bartolomaeum Clessin, 1873Clessin, 1873. Corrspbl. d. zool.-mineral. Ver. Regensburg: ??.
 Clessin, 1874. Conch. Cab. 9(3): 31, pl. 3, figs. 12-14.
 |  |
 | Pisidium pileus Clessin, 1873Clessin, 1873. Corrspbl. d. zool.-mineral. Ver. Regensburg: 160.
 Clessin, 1877. Conch. Cab. 9(3): 47, pl. 5, figs. 18-20.
 |  |
 | Pisidium milium var. alpestre Clessin, 1873Clessin, 1873. Corrspbl. d. zool.-mineral. Ver. Regensburg: ??.
 Clessin, 1874. Conch. Cab. 9(3): 21, pl. 2, fig. 16.
 |  |
 | Pisidium nitidum var. lacustris Clessin, 1873Clessin, 1873. Corrspbl. d. zool.-mineral. Ver. Regensburg: 28.
 |  |
 |