| Streptopinna | |
|---|---|
 | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Pteriida |
| Family: | Pinnidae |
| Genus: | Streptopinna von Martens, 1850 |
| Species: | S. saccata |
| Binomial name | |
| Streptopinna saccata | |
Streptopinna is an Indo-Pacific genus of bivalve molluscs characterized by a roughly triangular outline. There is only one species Streptopinna saccata.
No two 'Baggy Pen Shells' are alike: they grow into unexpected shapes, conforming to the shape and position of other hard structures (rocks, coral skeletons, empty shells) in their immediate environment.
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Warm waters of the tropical Indian and western Pacific oceans.
Buried in sandy bottoms.
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