Yoldiella indolens (W.H. Dall, 1908)
Yoldiella inflata A.E. Verrill & K.J. Bush,1897
Yoldiella insculpta (J.G. Jeffreys, 1879)
Portlandia intermedia (G.O. Sars, 1865)
Scissileda iris R.N. Kilburn, 1994
Portlandia isonota (E.C. Von Martens, 1881)
Megayoldia japonica (A. Adams & L.A. Reeve,1850)
Yoldiella jeffreysi (J.G. Hidalgo, 1877)
Yoldiella kaikonis T.A. Okutani & Y. Fujiwara,2005
Portlandia kakimii (FOSSIL) S. Uozumi, 1957 †
Yoldia kermadecensis Knudson, 1970
Yoldiella kibi (J.T. Kuroda, 1929)
Yoldia kikuchii J.T. Kuroda, 1929
Yoldia kindlei (FOSSIL) G.F. Harris, 1896 †
Yoldia kissoumi (FOSSIL) McLearn, 1933 †
Yoldia kovatschensis (FOSSIL) (Slodkewitsch, 1938 †)
Yoldia laevis (FOSSIL) (T. Say, 1824 †)
Yoldiella lapernoi N.P. Benaim & R.S. Absalão,2011
Yoldia lata (R.B. Hinds, 1843)
Portlandia laudabilis (FOSSIL) Yokoyama, 1924 †
Yoldiella lenticula (H.P.C. Møller, 1842)
Yoldiella leonilda (W.H. Dall, 1908)
Orthoyoldia lepidula (A. Adams, 1856)
Yoldiella leurovata (FOSSIL) J.D. Stilwell& Zinsmeister, 1992 †
Yoldiella librata (R.K. Dell, 1952)
Yoldia limatula (T. Say, 1831)
Yoldia limimtensis (FOSSIL) K.B. Barinov, 1992 †
Orthoyoldia liorhina (W.H. Dall, 1881)
Megayoldia lischkei (E.A. Smith, 1885)
Yoldia longifrons (FOSSIL) (T.A. Conrad, 1860 †)
Yoldia longissima (FOSSIL) Slodkewitsch, 1936 †
Yoldiella lucida (S.L. Lovén, 1846)
Microgloma macaron N.P. Benaim & R.S. Absalão,2011
Yoldia makarovi (FOSSIL) Evseev, 1964 †
Yoldiella malletioides (FOSSIL) P.A. Maxwell, 1992 †