Genus Perna J. G. Bruguiere, 1789 [not Philipsson, 1788]

(3-7-8-3-5-5-0-34-0-0-0-0-0)
Syn. Pernaria C. S. Rafinesque, 1815
[=Isognomon D. C. Solander in J. Lighfoot, 1786]
Ref. Abbott, 1974 p 440
Keen, 1971 p 79
Vokes, 1980 p 44
[=Isognomon D. C. Solander in J. Lightfoot, 1786]
Ref. Vaught, 1989 p 117

anomioides L. A. Reeve, 1858
(3-7-8-3-5-5-0-34-0-1-0-0-0)
[?=Isognomon (Isognomon) janus P. P. Carpenter, 1857]
Ref. Bernard, 1983 p 22
Keen, 1971 p 79

bicolor authors, not A. Adams, 1845
(3-7-8-3-5-5-0-34-0-2-0-0-0)
[=Isognomon (Isognomon) gaudichaudi (A. Orbigny, 1842)]
Ref. Bernard, 1983 p 22

californica T. A. Conrad, 1837
(3-7-8-3-5-5-0-34-0-3-0-0-0)
[=Isognomon (Isognomon) californicum (T. A. Conrad, 1837)]
Ref. Bernard, 1983 p 22

chemnitziana authors, not A. Orbigny, 1846
(3-7-8-3-5-5-0-34-0-4-0-0-0)
[=Isognomon (Isognomon) recognitus (J. Mabille, 1895)]
Ref. Abbott, 1974 p 441
Keen, 1971 p 79

chemnitzianus [chemnitziana] authors, not A. Orbigny in R. Sagra, 1845
(3-7-8-3-5-5-0-34-0-5-0-0-0)
[=Isognomon (Isognomon) gaudichaudi (A. Orbigny, 1842)]
Ref. Bernard, 1983 p 22
[=Isognomon (Isognomon) quadratus (H. E. Anton, 1837)]
Ref. Bernard, 1983 p 22

costellata [costellatum] T. A. Conrad, 1837
(3-7-8-3-5-5-0-34-0-6-0-0-0)
[=Isognomon (Isognomon) costellatum (T. A. Conrad, 1837)]
Ref. Bernard, 1983 p 22

gaudichaudi A. Orbigny, 1842
(3-7-8-3-5-5-0-34-0-7-0-0-0)
[=Isognomon (Isognomon) gaudichaudi (A. Orbigny, 1842)]
Ref. Bernard, 1983 p 22

hawaiiensis W. H. Pease, 1871
(3-7-8-3-5-5-0-34-0-8-0-0-0)
[=Isognomon (Isognomon) californicum (T. A. Conrad, 1837)]
Ref. Bernard, 1983 p 22

liguaeformis authors, not L. A. Reeve, 1858
(3-7-8-3-5-5-0-34-0-9-0-0-0)
[=Isognomon (Isognomon) quadratus (H. E. Anton, 1837)]
Ref. Bernard, 1983 p 22

quadrangularis L. A. Reeve, 1858
(3-7-8-3-5-5-0-34-0-10-0-0-0)
[=Isognomon (Isognomon) quadratus (H. E. Anton, 1837)]
Ref. Bernard, 1983 p 22

quadrata H. E. Anton, 1837
(3-7-8-3-5-5-0-34-0-11-0-0-0)
[=Isognomon (Isognomon) quadratus (H. E. Anton, 1837)]
Ref. Bernard, 1983 p 22

recognita authors, not J. Mabille, 1895
(3-7-8-3-5-5-0-34-0-12-0-0-0)
[=Isognomon (Isognomon) gaudichaudi (A. Orbigny, 1842)]
Ref. Bernard, 1983 p 22

recognita J. Mabille, 1895
(3-7-8-3-5-5-0-34-0-13-0-0-0)
[=Isognomon (Isognomon) quadratus (H. E. Anton, 1837)]
Ref. Bernard, 1983 p 22