Avellana tarrantensis (FOSSIL) Cragin, 1893 †
Ringicula tenuilabrum (FOSSIL) P.A. Maxwell, 1992 †
Ringicula teramachii (T. Habe, 1950)
Ringicula terquemi L.J. Morlet, 1880
Avellana texana (FOSSIL) Shumard, 1860 †
Ringicula titanica M.M. Schepman, 1913
Ringicula torquata (FOSSIL) J. Marwick, 1931 †
Ringicula tosaensis (T. Habe, 1950)
Ringicula trapaquara (FOSSIL) †
Ringicula trapequara (FOSSIL) G.F. Harris, 1895 †
Ringicula truncata G.B. III Sowerby, 1915
Ringicula turtoni P. Bartsch, 1915
Ringicula tutamoensis (FOSSIL) J. Marwick, 1931 †
Ringicula uniplicata (FOSSIL) F.W. Hutton, 1885 †
Avellana ventricosa (FOSSIL) (Seeley) †
Ringicula ventricosa (FOSSIL) (Sowerby, 1823 †)
Ringicula yokoyamai (T. Takeyama, 1935)
Ringicula zecorpulenta (FOSSIL) C.R. Laws, 1939 †