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Anodonta cellensis var. beringiana Middendorff, 1851 = Beringiana beringiana

Middendorff, 1851. Reise Nord. Ost. Sibiriens 2(1): 284, pl. 28, figs. 4-7; pl. 29, figs. 1-4.
(intro'd as intra-sp. of Anodonta cellensis Pfeiffer, 1821)

Unio (Alasm.) complanatus Middendorff, 1851 = Margaritifera middendorffi

‘Solander’ Middendorff, 1851. Reise Nord. Ost. Sibiriens 2(1): 273, pl. 27, figs. 1-6.
(misidentified reference to Mya complanata Lightfoot, 1786)

Cyclas calyculata var. compressa Middendorff, 1851 = Sphaerium lacustre

Middendorff, 1851. Reise Nord. Ost. Sibiriens 2(1): 288, pl. 29, figs. 9-10.
(intro'd as intra-sp. of Cyclas calyculata Draparnaud, 1806)

Unio (Alasm.) dahuricus Middendorff, 1850 = Margaritifera dahurica

Middendorff, 1850. Bull. Phys.-Math. Acad. Sci. St. Pétersbourg 9: 109.
Middendorff, 1851. Reise Nord. Ost. Sibiriens 2(1): 275, pl. 26, figs. 3-5.
Type(s): LECTOTYPE ZISP_7A, Argun’ River at the place of its joining the Shylka River.

Anodonta (Dispsas) herculea Middendorff, 1848 = Cristaria plicata

Middendorff, 1848. Bull. Phys.-Math. Acad. Sci. St. Pétersbourg 6: 303.
Middendorff, 1851. Reise Nord. Ost. Sibiriens 2(1): 278, pl. 21, fig. 5; 22, figs. 1-2; pl. 26, figs. 1-2.

Cyclas calyculata var. inflata Middendorff, 1851 = Sphaerium asiaticum

Middendorff, 1851. Reise Nord. Ost. Sibiriens 2(1): 287.
(intro'd as intra-sp. of Cyclas calyculata C.B. Adams, 1842)

Unio pictorum var. longirostris Middendorff, 1851 = Nodularia douglasiae

Middendorff, 1851. Reise Nord. Ost. Sibiriens 2(1): 276-277, pl. 28, figs. 1-3.
Schrenck, 1867. Reise Forsch. Amurlande 2: 696.
(misidentified reference to Unio longirostris Rossmässler, 1836)

Unio middendorffi Westerlund, 1890 = Nodularia douglasiae

Middendorff, 1851. Reise Nord. Ost. Sibiriens 2(1): 276-277, pl. 28, figs. 1-3 [as Unio pictorum var. longirostris].
Westerlund, 1890. Fauna Paläarct. Binnenconch. 2(7): 113.
Type(s): NEOTYPE BIV229_5 (by Bolotov et al., 2020: Table S1), Gladkaya River, Primorye Region, Russia.

Unio mongolicus Middendorff, 1851 = Middendorffinaia mongolica

Middendorff, 1851. Reise Nord. Ost. Sibiriens 2(1): 277, pl. 27, figs. 7-8.