Subgenus (Pegophysema) R. B. Stewart, 1930

(3-4-4-0-20-4-3-23-1-0-0-0-0)

edentuloides (A. E. Verrill, 1870)
(3-4-4-0-20-4-3-23-1-1-0-0-0)
Ref. Keen, 1971 p 126 bw
Syn. Loripes edentuloides A. E. Verrill, 1870;
Lucina (Lucina) spherica authors [not W. H. Dall & W. H. Ochsner, 1928]
Ref. Bernard, 1983 p 29

schrammi (H. Crosse, 1876)
(3-4-4-0-20-4-3-23-1-2-0-0-0)
Ref. Keen, 1971 p 126

spherica (W. H. Dall & W. H. Ochsner, 1928)
(3-4-4-0-20-4-3-23-1-3-0-0-0)
Syn. Lissosphaira spherica W. H. Dall & W. H. Ochsner, 1928
Ref. Keen, 1971 p 126