Subgenus (Acila) H. & A. Adams, 1858

(3-6-1-0-2-3-0-1-1-0-0-0-0)
Ref. Bernard, 1983 p 9

divaricata (R. B. Hinds, 1843) [T]
(3-6-1-0-2-3-0-1-1-1-0-0-0)
Divaricate Nut Clam
Ref. Abbott, 1974 p 411
Abbott & Dance, 1982 p 289 c
Syn. Nucula (Nucula) divaricata R. B. Hinds, 1843, not T. A. Conrad, 1848, not A. Valenciennes in A. Petit-Thouars, 1846;
Nucula (Nucula) mirabilis A. Adams & L. A. Reeve in A. Adams, 1850
Ref. Bernard, 1983 p 9

empirensis H. V. Howe, 1922
(3-6-1-0-2-3-0-1-1-2-0-0-0)
[=Acila (Truncacila) castrensis (R. B. Hinds, 1843)]
Ref. Bernard, 1983 p 9

? fultoni (E. A. Smith, 1892)
(3-6-1-0-2-3-0-1-1-3-0-0-0)
Fulton's Nut Clam
Ref. Abbott & Dance, 1982 p 290 c

? mirabilis (A. Adams & L. A. Reeve, 1850)
(3-6-1-0-2-3-0-1-1-4-0-0-0)
Wondrous Nut Clam
Ref. Abbott & Dance, 1982 p 290 c