Crassinella acuta (Dall, 1903) † (uncertain > unassessed )
Crassinella adamsi Olsson, 1961
Crassinella aduncata Weisbord, 1964 accepted as Crassinella dupliniana (Dall, 1903) †
Crassinella clementia Pilsbry & Olsson, 1941 accepted as Crassinella nuculiformis S. S. Berry, 1940
Crassinella coxa Olsson, 1964
Crassinella dupliniana (Dall, 1903) †
Crassinella ecuadoriana Olsson, 1961
Crassinella goldbaumi E. K. Jordan, 1936 accepted as Crassinella varians (P. P. Carpenter, 1857)
Crassinella guadalupensis (A. d'Orbigny, 1853) accepted as Crassinella lunulata (Conrad, 1834)
Crassinella guppyi Dall, 1896 † (uncertain > unassessed )
Crassinella haylocki Pilsbry & Olsson, 1941 accepted as Crassinella varians (P. P. Carpenter, 1857)
Crassinella lata Nowell-Usticke, 1969 (uncertain > taxon inquirendum )
Crassinella lunulata (Conrad, 1834)
Crassinella maldonadoensis (Pilsbry, 1897)
Crassinella marplatensis Castellanos, 1970
Crassinella martinicensis (A. d'Orbigny, 1853)
Crassinella mexicana Pilsbry & H. N. Lowe, 1932 accepted as Crassinella pacifica (C. B. Adams, 1852)
Crassinella nuculiformis S. S. Berry, 1940
Crassinella oregonensis Keen, 1938 accepted as Crassinella lunulata (Conrad, 1834)
Crassinella pacifica (C. B. Adams, 1852)
Crassinella quintinensis Manger, 1934 accepted as Crassinella pacifica (C. B. Adams, 1852)
Crassinella skoglundae Coan, 1979
Crassinella triquetra Weisbord, 1964 accepted as Crassinella dupliniana (Dall, 1903) †
Crassinella varians (P. P. Carpenter, 1857)
Crassinella waltoniana Mansfield, 1932 †
Mediraon divaricatum H. E. Vokes, 1946 †
Mediraon secundum (Whitfield, 1891) †
Remondia furcata Gabb, 1869 †