| Isognomon perna | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Pteriida |
| Family: | Isognomonidae |
| Genus: | Isognomon |
| Species: | I. perna |
| Binomial name | |
| Isognomon perna (Linnaeus, 1767) | |
| Synonyms | |
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Isognomon perna, the brown purse shell or rayed tree oyster, is a bivalve in the family Isognomonidae common in the Indo-Pacific including Hawaii.
Isognoma perna colors range from a brown or light-yellow purse shell to beige with a brown striped pattern and resembles a miniature clam.
Commonly found in the Indo-Pacific, including Hawaii, Western Polynesia, Eastern Polynesia, North to Japan Eastern to Southern Africa, New Caledonia, and Society Islands.
Isognomon perna live at depths of 0-20m in tropical climates; byssally attach to rocks, reef flats, or the underside of boulders. Commonly found under rocks in shallow water and arranged one on top of the other.