Identifying The Jackknife Clam Shell

Ensis directus (Conrad, 1843) English: America...The jackknife clam is an unusual shape and you’ll be able to identify it right away as the one that is sometimes called the “fingernail” shell.

Long (3-4 inches) and whitish colored, the shell is curved in a fashion resembling someones overgrown fingernail. We used to find them along the eastern shore of Florida.

My reference book says that the green jackknife (Solen viridis) is often found in north Florida and has more of a straight edge on one side, and the other type is called the minor jackknife (Enis minor).

Author: Pam

Spending time on the water is the best, and blogging about the sea life found along the saltwater river and ocean is what I do. I’m also a designer at Zazzle and sell my work, with a lot of ocean themes, on the site.

5 thoughts on “Identifying The Jackknife Clam Shell”

  1. I just got back from Old Orchard Beach, ME and found these shells all over the beach. I had never seen anything like it before. Thank you for being here to help me identify them!

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