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Life
Animals
Mollusks
Bivalves
Oysters and Allies
Pen Shells
Atrina

genus

Atrina

Atrina

Includes: 3 native
Where: In the US
Source: iNaturalist

Field notes

Children

Stiff Pen Shell presumed native
Sawtooth Pen Shell presumed native
Horse Mussel
Half-naked Pen Shell presumed native
Rough Penshell

Range

United States

Greener is more native, amber more introduced; paler is less certain. How this was decided

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