Dalyellia arctica Nasonov, 1923 accepted as Microdalyellia arctica (Nasonov, 1923) Gieysztor, 1938 (additional source)
Dalyellia armigera (Schmidt, 1861) Graff, 1905 accepted as Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 (additional source)
Dalyellia brevispina Hofsten, 1911 accepted as Microdalyellia brevispina (Hofsten, 1911) Gieysztor, 1939 (additional source)
Dalyellia cuspidata (Schmidt, 1861) Hofsten, 1907 accepted as Gieysztoria cuspidata (Schmidt, 1861) Ruebush & Hayes, 1939 (additional source)
Dalyellia fairchildi Graff, 1911 accepted as Microdalyellia fairchildi (Graff, 1911) Gieysztor, 1938 (additional source)
Dalyellia fusca (Fuhrmann, 1894) Graff, 1905 accepted as Microdalyellia fusca (Fuhrmann, 1894) Ruebush & Hayes, 1939 (additional source)
Dalyellia hallezii (Graff, 1882) Graff, 1905 (taxonomy source)
Dalyellia infundibuliformis (Fuhrmann, 1894) Graff, 1905 accepted as Microdalyellia infundibuliformis (Fuhrmann, 1894) Gieysztor, 1939 accepted as Microdalyellia (Gieysztoria) infundibuliformis (Fuhrmann, 1894) Gieysztor, 1939 accepted as Gieysztoria infundibuliformis (Fuhrmann, 1894) Ruebush & Hayes, 1939 (additional source)
Dalyellia karisalmica Nasonov, 1917 accepted as Dalyellia rossi Graff, 1911 accepted as Microdalyellia rossi (Graff, 1911) Gieysztor, 1938 (additional source)
Dalyellia kharkowiensis (Markow, 1904) Graff, 1905 accepted as Microdalyellia kharkowiensis (Markow, 1904) Ruebush & Hayes, 1939 (additional source)
Dalyellia kupelwieseri Meixner, 1915 accepted as Microdalyellia kupelwieseri (Meixner, 1915) Ruebush & Hayes, 1939 (additional source)
Dalyellia mollosovi Nasonov, 1920 accepted as Microdalyellia mollosovi (Nasonov, 1920) Gieysztor, 1938 (additional source)
Dalyellia nanella Beklemischev, 1921 accepted as Microdalyellia nanella (Beklemischev, 1921) Gieysztor, 1939 (additional source)
Dalyellia nigropontica accepted as Castrada (Castradella) quinquedentata Nasonov, 1924 (basis of record)
Dalyellia pallida Hofsten, 1907 accepted as Dalyellia virgulifera (Plotnikow, 1906) Graff, 1905 accepted as Microdalyellia virgulifera (Plotnikow, 1905) Gieysztor, 1938 accepted as Microdalyellia (Gieysztoria) virgulifera (Plotnikow, 1906) Gieysztor, 1938 accepted as Gieysztoria virgulifera (Plotnikow, 1906) Ruebush & Hayes, 1939 (source of synonymy)
Dalyellia picta (Schmidt, 1848) Graff, 1905 accepted as Microdalyellia picta (Schmidt, 1848) Gieysztor, 1938 (additional source)
Dalyellia schmidtii (Graff, 1882) Graff, 1905 accepted as Microdalyellia schmidtii (Graff, 1882) Gieysztor, 1938 (additional source)
Dalyellia sibirica (Plotnikow, 1905) Graff, 1904-1908 accepted as Microdalyellia (Gieysztoria) sibirica (Plotnikow, 1905) Gieysztor, 1939 accepted as Gieysztoria sibirica (Plotnikow, 1905) Ruebush& Hayes, 1939 (additional source)
Dalyellia striata (Plotnikow, 1905) Graff, 1913 accepted as Dalyellia fairchildi Graff, 1911 accepted as Microdalyellia fairchildi (Graff, 1911) Gieysztor, 1938 (source of synonymy)
Mesostoma platycephalum Braun, 1885 (additional source)
Olisthanella (Typhloplanella) septentrionalis Nasonov, 1925 accepted as Typhloplanella septentrionalis Nasonov, 1925 (additional source)
Olisthanella sexmaculata (Nasonov, 1923), Nasonov, 1924 accepted as Typhloplanella sexmaculata Nasonov, 1923 (new combination reference)
Polycystis goettei Bresslau, 1906 accepted as Opisthocystis goettei (Bresslau, 1906) Sekera, 1911 (additional source)
Sergia sergia (Beklemischev, 1918) Nasonov, 1923 accepted as Neosergia sergia (Beklemishev, 1918) Li, 2023 (additional source)

Black Sea for Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 
Poland for Gieysztoria cuspidata (Schmidt, 1861) Ruebush & Hayes, 1939 
Poland for Strongylostoma elongatum elongatum Hofsten, 1907 
Russia for Castrada (Castrada) lanceola (Braun, 1885) Luther, 1904 
Russia for Castrada (Castrada) lanceola (Braun, 1885) Luther, 1904 
Russia for Castrada (Castrada) lanceola (Braun, 1885) Luther, 1904 
Russia for Gieysztoria chlynovica occidentalis (Nasonov, 1920) Ruebush & Hayes, 1939 
Russia for Gieysztoria cuspidata (Schmidt, 1861) Ruebush & Hayes, 1939 
Russia for Gieysztoria cuspidata (Schmidt, 1861) Ruebush & Hayes, 1939 
Russia for Gieysztoria expedita (Hofsten, 1907) Ruebush & Hayes, 1939 
Russia for Gieysztoria expedita (Hofsten, 1907) Ruebush & Hayes, 1939 
Russia for Gieysztoria expedita (Hofsten, 1907) Ruebush & Hayes, 1939 
Russia for Gieysztoria infundibuliformis (Fuhrmann, 1894) Ruebush & Hayes, 1939 
Russia for Mesostoma lingua (Abildgaard, 1789) Schmidt, 1848 
Russia for Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 
Russia for Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 
Russia for Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 
Russia for Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 
Russia for Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 
Russia for Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 
Russia for Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 
Russia for Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 
Russia for Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 
Russia for Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 
Russia for Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 
Russia for Microdalyellia brevimana (Beklemischev, 1921) Gieysztor, 1938 
Russia for Microdalyellia brevimana (Beklemischev, 1921) Gieysztor, 1938 
Russia for Microdalyellia rossi (Graff, 1911) Gieysztor, 1938 
Russia for Microdalyellia rossi (Graff, 1911) Gieysztor, 1938 
Russia for Olisthanella (Typhloplanella) septentrionalis Nasonov, 1925 
Russia for Opistomum pallidum Schmidt, 1848 
Russia for Stenostomum leucops (Duges, 1828) Schmidt, 1848 
Russia for Strongylostoma elongatum elongatum Hofsten, 1907 
Russia for Strongylostoma elongatum elongatum Hofsten, 1907 
Russia for Strongylostoma elongatum elongatum Hofsten, 1907 
Russia for Strongylostoma elongatum elongatum Hofsten, 1907 
Russia for Strongylostoma elongatum elongatum Hofsten, 1907 
Russia for Strongylostoma radiatum (Müller, 1773) Örsted, 1843 
Russia for Strongylostoma radiatum (Müller, 1773) Örsted, 1843 
Russia for Strongylostoma radiatum (Müller, 1773) Örsted, 1843 
Russia for Strongylostoma radiatum (Müller, 1773) Örsted, 1843 
Russia for Strongylostoma radiatum (Müller, 1773) Örsted, 1843 
Russia for Strongylostoma radiatum (Müller, 1773) Örsted, 1843 
Russia for Strongylostoma radiatum (Müller, 1773) Örsted, 1843 
Russia for Strongylostoma radiatum (Müller, 1773) Örsted, 1843 
Ukraine for Castrada (Castrada) lanceola (Braun, 1885) Luther, 1904 
Ukraine for Castrella (Castrella) truncata (Abildgaard, 1789) Sekera, 1906 
Ukraine for Gieysztoria cuspidata (Schmidt, 1861) Ruebush & Hayes, 1939 
Ukraine for Mesostoma craci Schmidt, 1858 
Ukraine for Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 
Ukraine for Opistomum pallidum Schmidt, 1848 
Ukraine for Opistomum pallidum Schmidt, 1848 
Ukraine for Strongylostoma radiatum (Müller, 1773) Örsted, 1843 
Ukraine for Strongylostoma radiatum (Müller, 1773) Örsted, 1843