Isognomon perna
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Pteriida
Family:	Isognomonidae
Genus:	Isognomon
Species:	I. perna
Binomial name
Isognomon perna (Linnaeus, 1767)
Synonyms
List Isognomon roberti H. J. Koch, 1953 Isognomon sulcatum (Lamarck, 1819) Isogonum marsupiale Röding, 1798 Melina pernaeformis Philipsson, 1788 Ostrea perna Linnaeus, 1767 Perna costellata Conrad, 1837 Perna eremita Gould, 1850 Perna limoides Reeve, 1858 Perna linnaei Dunker, 1869 Perna marsupium Lamarck, 1819 Perna samoensis Baird, 1873 Perna sulcata Lamarck, 1819

Isognomon perna, the brown purse shell or rayed tree oyster, is a bivalve in the family Isognomonidae common in the Indo-Pacific including Hawaii.^[1][2]

Isognoma perna colors range from a brown or light-yellow purse shell to beige with a brown striped pattern and resembles a miniature clam.^[3]

Commonly found in the Indo-Pacific, including Hawaii, Western Polynesia, Eastern Polynesia, North to Japan Eastern to Southern Africa, New Caledonia, and Society Islands.^[4][5]

Isognomon perna live at depths of 0-20m in tropical climates; byssally attach to rocks, reef flats, or the underside of boulders.^[1] Commonly found under rocks in shallow water and arranged one on top of the other.^[6]

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