Genus Pachypoma J. E. Gray, 1850

(5-4-1-3-2-12-2-19-0-0-0-0-0)
Ref. Keen, 1971 p 355
[=Lithopoma J. E. Gray, 1850]
Ref. Vaught, 1989 p 11
[see also as Subgenus under Genus Astraea]

lithophorum W. H. Dall, 1910
(5-4-1-3-2-12-2-19-0-1-0-0-0)
[=Astraea (Pomaulax) gibberosa (L. W. Dillwyn, 1817)]
Ref. Keen, 1971 p 355

magdalena W. H. Dall, 1910
(5-4-1-3-2-12-5-19-0-2-0-0-0)
[=Astraea (Pomaulax) gibberosa (L. W. Dillwyn, 1817)]
Ref. Keen, 1971 p 355