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Mississippi National River and Recreation Area
Deertoe
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(Truncilla truncata) Rafinesque, 1820
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| U.S. Army Corps of Engineers |
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Can be found in various areas such as mud, sand, or gravel along medium to large rivers.
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Up to 2.0 inches (5.1 cm) in length.
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Varies. Usually yellow, green, or brown. Usually has green or brownrays spreading from the beak to the outer edges of the shell. Theselines are made up of small V-shaped marks or zig-zag lines.
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White, sometimes pink toward the longest end of the shell.
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Thin to moderately thick.
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An outline of the entire shell is nearly, but not perfectly, triangular(imagine a triangle blown up, like a balloon). The end closest to where the two halves meet is rounded from top to bottom, while the opposite end is bluntly pointed or truncated.
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Running your finger along the outer shell surface from where the two halves meet to the blunt point, you will feel a distinct ridge. The outer shell surface looks swollen. Rarely, the shell may look slightly pressed in on the shell's face nearest the point but away from the beak.
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Subtriangular shell of variable color with interrupted rays of green or brown V-shaped marks. Sharply pointed postbasal margin. Disc rarely sulcate. Rounded ventral margin. Sharp posterior ridge. Papillae present on narrow postbasal mantle margin. Heterogenous marsupium. Off-white soft parts.
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Widespread and common throughout much of its range.
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Did You Know?
According to the Environmental Protection Agency, more than 50 cities rely on the Mississippi River for daily water supply.
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Last Updated: September 25, 2006 at 09:51 EST |
