Baicalellia opaca (Sibiriakova, 1929) Ruebush & Hayes, 1939 (new combination reference)
Dalyellia Fleming, 1822 (subsequent type designation)
Dalyellia rossi tennesseensis Ruebush & Hayes, 1939 accepted as Microdalyellia rossi tennesseensis (Ruebush & Hayes, 1939) Ruebush & Hayes, 1939 accepted as Microdalyellia tennesseensis (Ruebush & Hayes, 1939) Ruebush & Hayes, 1939 (original description)
Fulinskiella sphyrocephala (Steinböck, 1931) Ruebush & Hayes, 1939 accepted as Fulinskiella bardeaui (Steinböck, 1926) Gieysztor & Szynal, 1939 (new combination reference)
Gieysztoria Ruebush & Hayes, 1939 (original description)
Gieysztoria chlynovica chlynovica (Nasonov, 1919) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria chlynovica occidentalis (Nasonov, 1920) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria lugubris (Reisinger, 1924) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria lugubris lugubris (Reisinger, 1924) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria lugubris wigrensis (Gieysztor, 1938) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria pavimentata (Beklemischev, 1926) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria quadridens (Böhmig, 1898) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria quadridensoides (Fuhrmann, 1914) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria rubra (Fuhrmann, 1894) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria rubra frankia (Nasonov, 1919) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria rubra intermedia (Gieysztor, 1931) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria rubra rubra (Fuhrmann, 1894) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria sibirica (Plotnikow, 1905) Ruebush& Hayes, 1939 (new combination reference)
Gieysztoria taurica (Nasonov, 1923) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria thienemanni (Reisinger, 1933) Ruebush & Hayes, 1939 (new combination reference)
Gieysztoria triangulata (Robeson, 1931) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) Ruebush & Hayes, 1939 accepted as Gieysztoria Ruebush & Hayes, 1939 (original description)
Microdalyellia (Gieysztoria) beltrani (Gieysztor, 1931) Ruebush & Hayes, 1939 accepted as Gieysztoria beltrani (Gieysztor, 1931) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) bergi (Beklemischev, 1927) Ruebush & Hayes, 1939 accepted as Gieysztoria bergi (Beklemischev, 1927) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) bicoronaria (Fulinski, 1933) Ruebush & Hayes, 1939 accepted as Gieysztoria bicoronaria (Fulinski, 1933) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) biwae (Okugawa, 1930) Ruebush & Hayes, 1939 accepted as Microdalyellia biwae (Okugawa, 1930) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) blodgetti (Silliman, 1884) Ruebush & Hayes, 1939 accepted as Gieysztoria pseudoblodgetti Luther, 1955 (additional source)
Microdalyellia (Gieysztoria) caucasica (Plotnikow, 1906) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) chlynovica (Nasonov, 1919) Ruebush & Hayes, 1939 accepted as Gieysztoria chlynovica (Nasonov, 1919) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) complicata (Fuhrmann, 1914) Ruebush & Hayes, 1939 accepted as Gieysztoria complicata (Fuhrmann, 1914) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) coronaria (Schmidt, 1858) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) cuspidata (Schmidt, 1861) Gieysztor, 1938 accepted as Gieysztoria cuspidata (Schmidt, 1861) Ruebush & Hayes, 1939 (additional source)
Microdalyellia (Gieysztoria) diadema (Hofsten, 1907) Ruebush & Hayes, 1939 accepted as Gieysztoria diadema (Hofsten, 1907) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) dodgei (Graff, 1911) Ruebush & Hayes, 1939 accepted as Gieysztoria dodgei (Graff, 1911) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) dubitativa (Sibiriakova, 1929) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) eastmani (Graff, 1911) Ruebush & Hayes, 1939 accepted as Gieysztoria eastmani (Graff, 1911) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) erivanica (Plotnikow, 1906) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) expedita (Hofsten, 1907) Gieysztor, 1938 accepted as Gieysztoria expedita (Hofsten, 1907) Ruebush & Hayes, 1939 (taxonomy source)
Microdalyellia (Gieysztoria) foreli (Hofsten, 1911) Gieysztor, 1938 accepted as Gieysztoria foreli (Hofsten, 1911) Ruebush & Hayes, 1939 (taxonomy source)
Microdalyellia (Gieysztoria) graffii (Hallez, 1878) Ruebush & Hayes, 1939 accepted as Gieysztoria expedita (Hofsten, 1907) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) inflata (Okugawa, 1930) Ruebush & Hayes, 1939 accepted as Gieysztoria inflata (Okugawa, 1930) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) infundibuliformis (Fuhrmann, 1894) Gieysztor, 1939 accepted as Gieysztoria infundibuliformis (Fuhrmann, 1894) Ruebush & Hayes, 1939 (taxonomy source)
Microdalyellia (Gieysztoria) japonica (Okugawa, 1930) Ruebush & Hayes, 1939 accepted as Gieysztoria japonica (Okugawa, 1930) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) lugubris wigrensis Gieysztor, 1938 accepted as Gieysztoria lugubris wigrensis (Gieysztor, 1938) Ruebush & Hayes, 1939 (taxonomy source)
Microdalyellia (Gieysztoria) minima (Riedel, 1932) Ruebush & Hayes, 1939 accepted as Gieysztoria minima (Riedel, 1932) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) nigrifrons (Karling, 1935) Ruebush & Hayes, 1939 accepted as Halammovortex nigrifrons (Karling, 1935) Karling, 1943 (new combination reference)
Microdalyellia (Gieysztoria) nigrofrons accepted as Microdalyellia (Gieysztoria) nigrifrons (Karling, 1935) Ruebush & Hayes, 1939 accepted as Halammovortex nigrifrons (Karling, 1935) Karling, 1943 (basis of record)
Microdalyellia (Gieysztoria) ornata (Hofsten, 1907) Gieysztor, 1938 accepted as Gieysztoria ornata (Hofsten, 1907) Ruebush & Hayes, 1939 (taxonomy source)
Microdalyellia (Gieysztoria) oryzae (Nasonov, 1929) Ruebush & Hayes, 1939 accepted as Gieysztoria oryzae (Nasonov, 1929) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) pachyderma (Steinbock, 1931) Ruebush & Hayes, 1939 accepted as Castrella (Nasonoviella) lutheri (Nasonov, 1917) Luther, 1955 (new combination reference)
Microdalyellia (Gieysztoria) pavimentata (Beklemischev, 1926) Ruebush & Hayes, 1939 accepted as Gieysztoria pavimentata (Beklemischev, 1926) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) quadridens (Böhmig, 1898) Ruebush & Hayes, 1939 accepted as Gieysztoria quadridens (Böhmig, 1898) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) quadridensoides (Fuhrmann, 1914) Ruebush & Hayes, 1939 accepted as Gieysztoria quadridensoides (Fuhrmann, 1914) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) rhombigera (Plotnikow, 1905) Ruebush & Hayes, 1939 accepted as Gieysztoria expedita (Hofsten, 1907) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) rubra (Fuhrmann, 1894) Gieysztor, 1939 accepted as Gieysztoria rubra (Fuhrmann, 1894) Ruebush & Hayes, 1939 (taxonomy source)
Microdalyellia (Gieysztoria) siberica accepted as Microdalyellia (Gieysztoria) sibirica (Plotnikow, 1905) Gieysztor, 1939 accepted as Gieysztoria sibirica (Plotnikow, 1905) Ruebush& Hayes, 1939 (basis of record)
Microdalyellia (Gieysztoria) taurica (Nasonov, 1923) Ruebush & Hayes, 1939 accepted as Gieysztoria taurica (Nasonov, 1923) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) thienemanni (Reisinger, 1933) Ruebush & Hayes, 1939 accepted as Gieysztoria thienemanni (Reisinger, 1933) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) triangulata (Robeson, 1931) Ruebush & Hayes, 1939 accepted as Gieysztoria triangulata (Robeson, 1931) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) triquetra (Fuhrmann, 1894) Ruebush & Hayes, 1939 accepted as Gieysztoria triquetra (Fuhrmann, 1894) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Gieysztoria) virgulifera (Plotnikow, 1906) Gieysztor, 1938 accepted as Gieysztoria virgulifera (Plotnikow, 1906) Ruebush & Hayes, 1939 (taxonomy source)
Microdalyellia (Gieysztoria) zykovi (Nasonov, 1919) Ruebush & Hayes, 1939 accepted as Gieysztoria zykovi (Nasonov, 1919) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia (Microdalyellia) Reubush & Hayes, 1939 (original description)
Microdalyellia abursalis (Ruebush, 1937) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia armigera (Schmidt, 1862) Gieysztor, 1938 (additional source)
Microdalyellia articulata (Graff, 1911) Ruebush & Hayes, 1939 accepted as Microdalyellia rheesi (Graff, 1911) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia benacensis (Steinböck, 1932) Ruebush & Hayes, 1939 accepted as Microdalyellia brevimana (Beklemischev, 1921) Gieysztor, 1938 (new combination reference)
Microdalyellia bicornis (Nasonov, 1926) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia biwae (Okugawa, 1930) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia brevimana (Beklemischev, 1921) Gieysztor, 1938 (additional source)
Microdalyellia brevispina (Hofsten, 1911) Gieysztor, 1939 (additional source)
Microdalyellia brevistyla (Eggers, 1925) Ruebush & Hayes, 1939 accepted as Microdalyellia picta (Schmidt, 1848) Gieysztor, 1938 (new combination reference)
Microdalyellia circulobursalis (Ruebush, 1937) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia deses (Riedel, 1932) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia fairchildi (Graff, 1911) Gieysztor, 1938 (additional source)
Microdalyellia fusca (Fuhrmann, 1894) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia groenlandica (Riedel, 1932) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia halezii (Graff, 1882) Ruebush & Hayes, 1939 accepted as Dalyellia hallezii (Graff, 1882) Graff, 1905 (new combination reference)
Microdalyellia karisalmica (Nasonov, 1917) Ruebush & Hayes, 1939 accepted as Dalyellia karisalmica Nasonov, 1917 accepted as Dalyellia rossi Graff, 1911 accepted as Microdalyellia rossi (Graff, 1911) Gieysztor, 1938 (new combination reference)
Microdalyellia kessleri (Plotnikow, 1906) Ruebush & Hayes, 1939 accepted as Gieysztoria cuspidata (Schmidt, 1861) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia kharkowiensis (Markow, 1904) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia koiwi (Eggers, 1924) Gieysztor, 1938 accepted as Gieysztoria koiwi (Eggers, 1924) Luther, 1955 (additional source)
Microdalyellia lutheri (Nasonov, 1917) Gieysztor, 1938 accepted as Castrella (Nasonoviella) lutheri (Nasonov, 1917) Luther, 1955 (taxonomy source)
Microdalyellia microphthalma (Vejdovsky, 1895) Gieysztor, 1938 (taxonomy source)
Microdalyellia mohicana (Graff, 1911) Ruebush & Hayes, 1939 (basis of record)
Microdalyellia mollosovi (Nasonov, 1920) Gieysztor, 1938 (taxonomy source)
Microdalyellia nanella (Beklemischev, 1921) Gieysztor, 1939 (taxonomy source)
Microdalyellia okugawai Ruebush & Hayes, 1939 accepted as Gieysztoria (Marcusiella) okugawai (Ruebush & Hayes, 1939) Marcus, 1946 (replacement name source)
Microdalyellia ornata drozdowicensis (Fulinski, 1915) Gieysztor, 1938 (additional source)
Microdalyellia paucispinosa (Sekera, 1888) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia picta (Schmidt, 1848) Gieysztor, 1938 (additional source)
Microdalyellia polychaeta (Nasonov, 1919) Ruebush & Hayes, 1939 accepted as Microdalyellia fairchildi (Graff, 1911) Gieysztor, 1938 (new combination reference)
Microdalyellia rheesi (Graff, 1911) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia rochesteriana (Graff, 1911) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia rossi (Graff, 1911) Gieysztor, 1938 (additional source)
Microdalyellia schmidtii (Graff, 1882) Gieysztor, 1938 (taxonomy source)
Microdalyellia sillimani (Graff, 1911) Ruebush & Hayes, 1939 (new combination reference)
Microdalyellia striata (Plotnikow, 1905) Ruebush & Hayes, 1939 accepted as Microdalyellia fairchildi (Graff, 1911) Gieysztor, 1938 (new combination reference)
Microdalyellia transilvana (Paradi, 1882) Ruebush & Hayes, 1939 accepted as Gieysztoria transilvana (Paradi, 1882) Luther, 1955 (new combination reference)
Microdalyellia tsurugae (Nasonov, 1929) Ruebush & Hayes, 1939 (new combination reference)

Tennessee for Microdalyellia tennesseensis (Ruebush & Hayes, 1939) Ruebush & Hayes, 1939 

 Taxonomy

 for Dalyellia rossi tennesseensis Ruebush & Hayes, 1939

The original placement of this taxon is quite confusing. Ruebush & Hayes (1939) describe it explicitly as a species ... [details]

 Taxonomy

 for Microdalyellia rossi tennesseensis (Ruebush & Hayes, 1939) Ruebush & Hayes, 1939

The original placement of this taxon is quite confusing. Ruebush & Hayes (1939) describe it explicitly as a taxon ... [details]

 Taxonomy

 for Microdalyellia tennesseensis (Ruebush & Hayes, 1939) Ruebush & Hayes, 1939

The original placement of this taxon is quite confusing. Ruebush & Hayes (1939) describe it explicitly as a taxon ... [details]