Subgenus (Isognomon) J. Lightfoot, 1786

(3-7-8-3-5-5-0-15-2-0-0-0-0)
Ref. Bernard, 1983 p 21

alatus (J. F. Gmelin, 1791)
(3-7-8-3-5-5-0-15-2-1-0-0-0)
Flat Tree Oyster, Flat Tree-oyster
Ref. Abbott, 1974 p 441 c
Abbott & Dance, 1982 p 302 c
Amer. Fish. Soc., 1988 p 25

bicolor (C. B. Adams, 1845)
(3-7-8-3-5-5-0-15-2-2-0-0-0)
Bicolor Purse-oyster, Two-toned Tree Oyster
Ref. Amer. Fish. Soc., 1988 p 25
Syn. Isognomon (Isognomon) chemnitzianus (A. Orbigny, 1846)
Ref. Abbott, 1974 p 441 c
Abbott & Dance, 1982 p 302 c

californicum [californica] (T. A. Conrad, 1837)
(3-7-8-3-5-5-0-15-2-3-0-0-0)
Syn. Perna californica T. A. Conrad, 1837;
Perna hawaiiensis W. H. Pease, 1871
Ref. Bernard, 1983 p 22

costellatum [costellata] (T. A. Conrad, 1837)
(3-7-8-3-5-5-0-15-2-4-0-0-0)
[=Isognomon (Isognomon) perna (C. v. Linne, 1767)]
Ref. Abbott & Dance, 1982 p 302
Syn. Perna costellata T. A. Conrad, 1837
Ref. Bernard, 1983 p 22

chemnitzianus (A. Orbigny, 1846)
(3-7-8-3-5-5-0-15-2-5-0-0-0)
[=Isognomon (Isognomon) bicolor (C. B. Adams, 1845)]
Ref. Abbott, 1974 p 441
Abbott & Dance, 1982 p 302

? ephippium (C. v. Linne, 1758)
(3-7-8-3-5-5-0-15-2-6-0-0-0)
Saddle Tree Oyster
Ref. Abbott & Dance, 1982 p 302 c

gaudichaudi (A. Orbigny, 1842)
(3-7-8-3-5-5-0-15-2-7-0-0-0)
Syn. Melina araucana R. A. Philippi, 1887;
Melina pusilla R. A. Philippi, 1887;
Perna bicolor authors, not A. Adams, 1845;
Perna chemnitzianus authors, not A. Orbigny in R. Sagra, 1845;
Perna gaudichaudi A. Orbigny, 1842;
Perna recognita authors, not J. Mabille, 1895
Ref. Bernard, 1983 p 22

? isognomum (C. v. Linne, 1758)
(3-7-8-3-5-5-0-15-2-8-0-0-0)
Pacific Tree Oyster
Ref. Abbott & Dance, 1982 p 302 c

janus P. P. Carpenter, 1857
(3-7-8-3-5-5-0-15-2-9-0-0-0)
Thin Purse-oyster
Ref. Abbott, 1974 p 441
Amer. Fish. Soc., 1988 p 25
Syn. ? Perna anomioides L. A. Reeve, 1858
Ref. Bernard, 1983 p 22
Keen, 1971 p 79 bw

listeri S. C. T. Hanley, 1843
(3-7-8-3-5-5-0-15-2-10-0-0-0)
[=Isognomon (Isognomon) radiatus (H. E. Anton, 1839)]
Ref. Abbott, 1974 p 441
Abbott & Dance, 1982 p 302

perna (C. v. Linne, 1767) [T]
(3-7-8-3-5-5-0-15-2-11-0-0-0)
Rayed Tree Oyster
Ref. Abbott, 1974 p 440
Syn. Isognomon (Isognomon) costellata T. A. Conrad
Ref. Abbott & Dance, 1982 p 302 c

quadratus [quadrata] (H. E. Anton, 1837)
(3-7-8-3-5-5-0-15-2-12-0-0-0)
Syn. Ostrea legumen authors, not J. F. Gmelin, 1791;
Perna chemnitziana authors, not A. Orbigny in R. Sagra, 1845;
Perna liguaeformis authors, not L. A. Reeve, 1858;
Perna quadrangularis L. A. Reeve, 1858;
Perna quadrata H. E. Anton, 1837;
Perna recognita J. Mabille, 1895
Ref. Bernard, 1983 p 22

radiatus (H. E. Anton, 1839)
(3-7-8-3-5-5-0-15-2-13-0-0-0)
Lister Purse-oyster, Lister's Tree Oyster
Ref. Amer. Fish. Soc., 1988 p 25
Syn. Isognomon (Isognomon) listeri S. C. T. Hanley, 1843
Ref. Abbott, 1974 p 441 c
Abbott & Dance, 1982 p 302 c

recognitus (J. Mabille, 1895)
(3-7-8-3-5-5-0-15-2-14-0-0-0)
Syn. Perna chemnitziana authors, not A. Orbigny, 1846
Ref. Abbott, 1974 p 441
Keen, 1971 p 79 bw

vulsella J. B. P. A. de Lamarck
(3-7-8-3-5-5-0-15-2-15-0-0-0)
Ref. Abbott, 1974 p 441