Pyramid pigtoe
Pleurobema rubrum (Rafinesque, 1820) |
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Pyramid pigtoe |
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| Pleurobema rubrum, INHS 3122. Little Wabash River, Wayne County, Illinois. Length: 2.4 inches (6.1 cm).
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| Other common names Pink pigtoe.
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| Key characters Triangular and elongate shell, shallow sulcus present,
rose-colored nacre, moderately deep beak cavity.
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| Similar species All other pigtoes (Fusconaia and
Pleurobema).
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| Description Shell thick, triangular and elongate, and moderately
inflated. Anterior end rounded, posterior end rounded to bluntly pointed.
Dorsal and ventral margins curved. Umbos high, projected forward, and anterior
to rest of shell. Shell smooth or satin-like. Shallow sulcus present.
Periostracum brown or chestnut, with faint green rays on the umbos. Length to 4
inches (10.2 cm). Pseudocardinal teeth well developed; two in the left valve, one in the right. Lateral teeth straight or slightly curved. Beak cavity moderately deep. Nacre pink or rose-colored in most individuals, occasionally white.
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| Habitat Medium to large rivers in sand or gravel in areas with a good
current.
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Status Widespread but rare in the Ohio River drainage. Federal
Candidate (Category 2). Endangered in Indiana and Ohio. Species of Special
Concern in Illinois.
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