Species under Isognomon
n= 15
Species name Common name Distribution Max. Length (cm)
Isognomon alatus
(Gmelin, 1791)
flat tree-oyster Western Atlantic 7.2
Isognomon anomioides
(Reeve, 1858)
Indo-Pacific
Isognomon bicolor
(Adams, 1845)
bicolor purse-oyster Western Atlantic 3.5
Isognomon ephippium
(Linnaeus, 1758)
saddle tree oyster Indo-West Pacific 14
Isognomon fimbriatus
(Reeve, 1859)
Western Central Pacific
Isognomon incisum
(Conrad, 1837)
Eastern Pacific
Isognomon isognomum
(Linnaeus, 1758)
wader tree oyster Indo-Pacific 15
Isognomon janus
Carpenter, 1857
thin purse-oyster Eastern Pacific
Isognomon legumen
(Gmelin, 1790)
pod tree oyster Indo-Pacific
Isognomon marsupialis
Roding, 1798
Northwest Pacific
Isognomon nucleus
(Lamarck, 1819)
Indo-Pacific
Isognomon perna
(Linnaeus, 1767)
rayed tree oyster Indo-West Pacific 7.5
Isognomon radiatus
(Anton, 1839)
radial purse-oyster Western Atlantic
Isognomon recognitus
(Mabille, 1895)
purple purse-oyster Eastern Pacific
Isognomon vulselloides
Macsotay & Campos, 2001
Western Atlantic 1.58
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