Yoldia scissurata W.H. Dall, 1897
Yoldiella seguenzae A. Bonfitto & B. Sabelli,1995
Yoldia seminuda W.H. Dall, 1871
Yoldia seminuda ensifera W.H. Dall, 1897
Scissileda semisculpta (K.H.J. Thiele& S.G.A. Jaeckel, 1931)
Yoldiella semistriata (J.G. Jeffreys, 1879)
Yoldia semistriata (FOSSIL) (Wood, 1840 †)
Yoldia serica (FOSSIL) T.A. Conrad, 1848 †
Orthoyoldia serotina (R.B. Hinds, 1843)
Yoldiella siberutensis (K.H.J. Thiele& S.G.A. Jaeckel, 1931)
Yoldiella similiris J.A. Allen, A. Sanders& G. Hannah, 1995
Yoldiella similis J.A. Allen, A. Sanders& G. Hannah, 1995
Yoldia similis J.T. Kuroda& T. Habe in T. Habe, 1961
Yoldiella sinuosa J.A. Allen, A. Sanders& G. Hannah, 1995
Orthoyoldia solenoides (W.H. Dall, 1881)
Yoldiella solidula A. Warén, 1989
Yoldiella sootryeni J. Knudsen, 1970
Yoldiella squamaeformis (T.A. Okutani, 1962)
Yoldiella stimulea (FOSSIL) (J. Marwick, 1931 †)
Portlandia stricta A.E. Verrill & K.J. Bush,1897
Yoldiella striolata (G.A. Brugnone, 1876)
Yoldia subamygdalea (FOSSIL) Y.B. Gladenkov, 1984 †
Yoldiella subcircularis (N.H. Odhner, 1960)
Yoldia subscitula (FOSSIL) F.B. Meek & Hayden,1865 †
Portlandia sulcifera (L.A. Reeve, 1855)
Adranella sundaica (K.H.J. Thiele& S.G.A. Jaeckel, 1931)
Yoldia supramontereyensis (FOSSIL) R. Arnold, 1908 †
Cnesterium supraoregona (FOSSIL) Khomenko, 1931 †
Nampiella takaradaiensis (FOSSIL) (L. Krishtofovich,1957 †)
Yoldiella tamara (G.P. Gorbunov, 1946)
Yoldia temblorensis (FOSSIL) F.M. Anderson & Martin,1914 †
Orthoyoldia tenella (R.B. Hinds, 1843)
Kalayoldia tenuissima (FOSSIL) (Clark, 1918 †)
Yoldiella thaerella I.J. Killeen & H. Turner,2009
Megayoldia thraciaeformis (D.H. Storer, 1838)