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The pen shell, Streptopinna saccata, is a bivalve that can reach 9 inches in length. The sides of the shell are fused together and so the opening is a permanent structure, Maui, Hawaii.
No usage of this image, of any kind, is granted without the express written consent of David Fleetham.
© David Fleetham Underwater Photography
email@example.com 808-283-1154 Maui, Hawaii, USA.