Freshwater Mussels Pacific Northwest - The Xerces Society
Freshwater Mussels Pacific Northwest - The Xerces Society
Freshwater Mussels Pacific Northwest - The Xerces Society
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Upper Klamath Lake. photo: Dennis Frates<br />
26<br />
Anodonta Clade 2<br />
Oregon Floater Anodonta oregonensis Lea, 1838<br />
Western Floater Anodonta kennerlyi Lea, 1860<br />
Description 15,18<br />
Size: Adult size from 4.75 to 7.25 inches.<br />
Shape: Elliptical; L:H ratio close to, or exceeding, 2.0. Dorsal posterior margin<br />
may be compressed and formed into slight wing, but this trait is variable.<br />
Valves laterally inflated, thin, and fragile.<br />
Beaks: Low; rarely project above the hinge line.<br />
Periostracum: Yellowish, yellowish-brown, brown, or black. Some specimens<br />
may have a tinge of green. Periostracum is usually shiny, and growth lines are<br />
usually evident.<br />
Hinge Teeth: None<br />
Nacre: White or bluish-white, sometimes pinkish toward the central portion<br />
of the nacre and iridescent toward the posterior end.<br />
Range<br />
<strong>The</strong> geographic range of this clade is in question because of the taxonomic<br />
uncertainty that has plagued these “species.” A. oregonensis were confused<br />
with A. beringiana in the northern part of their range and confused with A.<br />
<strong>Freshwater</strong> <strong>Mussels</strong> of the <strong>Pacific</strong> <strong>Northwest</strong>
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