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Southwest Florida Shells with Emphasis on Sanibel & Captiva

By José H. Leal

Family Mangeliidae

Glyphoturris quadrata

(Reeve, 1845)

Squared Turrid

Shell size to 8 mm; shell turriform, strongly angled at the periphery of whorls, which imparts a “squarish” aspect to last whorl. Sculpture of 12–15 axial ribs per whorl and spiral cords crossed by axial, narrow lines. Spiral cords doubled at periphery. Outer lip thick in mature individuals. Color cream-white with brownish markings in the interstices between ribs, these markings stronger just below suture. All shells illustrated are from Sanibel Island. Supplementary images show (left) a shell with more pronounced sculpture, but with a damaged anterior canal, and (right) an immature (young) shell.