Entolium membranaceum (Nilsson, 1827) † (additional source)
Entolium noetlingi (Sobetski, 1960) † (basis of record)
Entolium sublaminosum (Favre, 1869) † accepted as Entolium orbiculare (J. Sowerby, 1817) † (source of synonymy)
Parvamussium inversum (Nilsson, 1827) † (additional source)
Pecten (Amusium) balticus Dames, 1874 † accepted as Entolium orbiculare (J. Sowerby, 1817) † (source of synonymy)
Pecten (Entolium) pusillulus Griepenkerl, 1889 † accepted as Syncyclonema haggi Dhondt, 1971 † (source of synonymy)
Pecten (Syncyclonema) losseriensis F. Vogel, 1895 † accepted as Entolium orbiculare (J. Sowerby, 1817) † (source of synonymy)
Pecten calypso A. d'Orbigny, 1850 † accepted as Entolium orbiculare (J. Sowerby, 1817) † (source of synonymy)
Pecten darius A. d'Orbigny, 1850 † accepted as Entolium orbiculare (J. Sowerby, 1817) † (source of synonymy)
Pecten laminosa Mantell, 1822 † accepted as Entolium orbiculare (J. Sowerby, 1817) † (source of synonymy)
Pecten latus F. von Hagenow, 1842 † accepted as Entolium membranaceum (Nilsson, 1827) † (source of synonymy)
Pecten neptuni A. d'Orbigny, 1850 † accepted as Entolium orbiculare (J. Sowerby, 1817) † (source of synonymy)
Pecten pusillus Alth, 1850 † accepted as Syncyclonema haggi Dhondt, 1971 † (status source)
Pecten rotundus F. von Hagenow, 1842 † accepted as Entolium membranaceum (Nilsson, 1827) † (source of synonymy)
Pecten spathulatus F. A. Roemer, 1841 † accepted as Syncyclonema nilssoni (Goldfuss, 1835) † (source of synonymy)
Pecten squamula var. octosulcatus Geinitz, 1842 † accepted as Parvamussium inversum (Nilsson, 1827) † (source of synonymy)
Pecten sublaminosus Favre, 1869 † accepted as Entolium orbiculare (J. Sowerby, 1817) † (source of synonymy)
Pecten subsquamula A. d'Orbigny, 1850 † accepted as Parvamussium inversum (Nilsson, 1827) † (source of synonymy)
Propeamussium (Parvamussium) inversum (Nilsson, 1827) † accepted as Parvamussium inversum (Nilsson, 1827) † (basis of record)
Propeamussium samariensis (Conrad, 1852) † (basis of record)
Pseudamussium pusillulum (Griepenkerl, 1889) † accepted as Syncyclonema haggi Dhondt, 1971 † (source of synonymy)
Syncyclonema cretacea (Nyst, 1843) † (basis of record)
Syncyclonema gamsensis Dhondt, 1971 † (original description)
Syncyclonema greppini (Pictet & Renevier, 1858) † (basis of record)
Syncyclonema hagenowi Dhondt, 1971 † (original description)
Syncyclonema haggi Dhondt, 1971 † (original description)
Syncyclonema haldonensis (H. Woods, 1902) † (basis of record)
Syncyclonema nilsoni (Goldfuss, 1835) † accepted as Syncyclonema nilssoni (Goldfuss, 1835) † (additional source)
Syncyclonema semiplicata (Alth, 1850) † (basis of record)

Austria for Syncyclonema gamsensis Dhondt, 1971 † 
Belgium for Syncyclonema hagenowi Dhondt, 1971 † 

 Classification

 for Propeamussium samariensis (Conrad, 1852) †

Considered "very similar" to Propeamussium (Parvamussium) inversum (Nilsson, 1827) [now Parvamussium inversum] by ... [details]

 Nomenclature

 for Syncyclonema haggi Dhondt, 1971 †

New name for Pecten laevis Nilsson, 1827, non Pennant, 1777 [details]

 Status

 for Pecten pusillus Alth, 1850 †

Invalid: junior homonym of Pecten pusillus Münster, 1835. Considered a tentative synonym of Syncyclonema haggi [= ... [details]