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Shell of the Week: The Lunate Crassinella

Giving continuity to our discussions on small local bivalves, I want to introduce one of the most distinctive species in that category: Crassinella lunulata (Conrad, 1834). Measuring at most 8 mm (about 0.32 inch), the Lunate Crassinella has an almost-triangular, flattish shell marked by 15–17 very distinctive, coarse, commarginal (“concentric”) ridges. The shell color shows variations of brownish to reddish-brown spots and rays, and the shell interior is usually brown.


The Lunate Crassinella, Crassinella lunulata, from Sanibel. Photos by José H. Leal.

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