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  • José H. Leal

The Semisulcate Moon Snail


There are locally at least eight shallow-water species of the Moon Snail family Naticidae. The half-inch long Semisulcate Moon Snail, Sigatica semisulcata (J.E. Gray, 1839) is the second smallest of them. (The smallest is the Miniature Moon Snail, Tectonatica pusilla, measuring only about ¼ inch.) Semisulcate Moon Snails have egg-shaped, almost always pure-white shells. The species distinguishing feature, other than its relatively small size, is the presence of 2­­­–6 incised (“etched”) spiral lines just below the shell suture (the lines that separates two adjacent shell whorls, or “turns”.


The Semisulcate Moon Snail, Sigatica semisulcata, from Sanibel; arrows show characteristic spiral lines. Photo by José H. Leal.

#whorls #SemisulcateMoonSnail #Sigaticasemisulcata #Tectonaticapusilla #suture