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Southwest Florida Shells with Emphasis on Sanibel & Captiva
José H. Leal
Family Mytilidae
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Modiolus americanus
(Leach, 1815)
American Horse Mussel

Shell size to 100 mm; shell mussel-shaped, trigonal. Sculpture of fine growth lines. Umbones swollen, not terminal (away from end of shell). No hinge teeth. Periostracum heavy, sometimes hair-like. Color light-brown with blush of rose (concentrated on umbones) and purple streaks.
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