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Southwest Florida Shells

José H. Leal

Modiolus americanus

(Leach, 1815)

Family Mytilidae

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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