Long-solid
Fusconaia subrotunda (Lea, 1831) |
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Long-solid |
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| Fusconaia subrotunda, INHS 12896. Green River, Hart County, Kentucky. Length: 2.9 inches (7.4 cm).
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| Other common names Round-solid, pigtoe.
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| Key characters Smooth, elongate, and solid shell; beak cavity very
deep, green rays on the umbo.
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| Similar species Ebonyshell, pigtoes (Fusconaia and
Pleurobema).
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| Description Shell relatively large, solid, elongate, oval or
elliptical, and moderately inflated. Anterior end rounded, posterior end
rounded or bluntly pointed. Dorsal margin and ventral margins straight to
slightly curved. Umbos low and directed forward. Shell smooth, light brown,
becoming dark brown to black in adults. Fine green rays present on juveniles
and the umbos of older shells. Length to 5 inches (12.7 cm). Pseudocardinal teeth large and well developed; two in the left valve, one in the right (occasionally with a small tooth on either side). Lateral teeth large and straight; two in the left valve, one in the right. Beak cavity very deep. Nacre white, iridescent posteriorly.
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| Habitat Large rivers in gravel.
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Status Endangered in Indiana and Ohio. Extirpated from Illinois.
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