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Mississippi National River and Recreation Area
White Heelsplitter
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(Lasmigona complanata) Barnes, 1823f
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| K.S. Cummings, Illinois Natural History Survey |
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Pancake; Razorback; Elephant-ear; Hackle-back.
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Pools or sluggish streams with a mud, sand, or fine gravel bottom.
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Up to 8 inches (20.3 cm).
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Dark brown or black shell.
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Bluish white or white, with some iridescent coloring on one end of the shell.
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Relatively thin. Very thin in young mussels.
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The entire shell outline is shaped somewhat like an equal-sided triangle that has been blown-up, like a balloon. An extension of the shell resembling a large, flat triangular wing makes up one "corner" of the entire shell outline. Imagining the shell without a wing, the shell shape is somewhat egg-shaped, but the edge that meets with the wing is straight.
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Outer shell surface is flat and smooth, except for some low wavy ridges on the wing, and two distinct low ridges that run in a straight line from the beak, separating the triangular wing from the shell body.
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Very compressed brown or black shell. Large posterior ala. Beak sculptured with two diverging rows of tubercles extending onto disc as shallow ridges on posterior slope. Sexes alike. Postbasal mantle margin narrow, simple. Homogeneous marsupium.
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Common Carp, Green Sunfish, Largemouth Bass, White Crappie, Orangespotted Sunfish, Banded Killifish
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Did You Know?
A single canoe can pass through a lock and dam; and it's free! The Upper St. Anthony Falls Lock and Dam within the Mississippi National River and Recreation Area is 49 feet deep.
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Last Updated: September 20, 2006 at 14:56 EST |
