Page 242 - The Freshwater Mussels of Oklahoma
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Description:
“Shell rounded to slightly triangular and inflated. Anterior and posterior margins
rounded. Umbos high, centrally located, and elevated above the hinge line. Periostracum
yellowish brown to black with numerous concentric rows of elevated lines covering the
surface of the shell. Young shells with a purple stripe on the umbo. Length to 1.5 inches
(3.8 cm).
Three triangular cardinal teeth in each valve located directly below the umbo.
Two sets of lateral teeth in each valve, moderately long, straight, and serrated; paired in
the right valve, one on each side in the left. Beak cavity deep. Nacre white or purple and
highly polished outside of the pallial line” (Cummings and Mayer, 1992).
Comments:
This species first appeared in the United States in the 1930’s on the west coast
and has rapidly spread completely across the continent.
Oklahoma Distribution:
This species is found throughout most of the river systems and lakes within the
state.
Map 49. Distribution of C. fluminea in Oklahoma.
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