Federal
Status: Not listed (Watters 1995)
Pondhorn - Uniomerus tetralasmus
Federal
Status: Not listed (Watters 1995)
Ohio Status: Threatened (Watters 1995)
Key characteristics: Relatively thin, smooth, elongate shell, light to dark brown, pointed, and rayless. Posterior slope with a short ridge formed by two shallow grooves on either side.
Similar species: Yellow sandshell, giant floater, cracking pearlymussel, cylindrical papershell, squawfoot.
Description: Shell relatively thin, elongate, and compressed to moderately inflated. Anterior end rounded, posterior end bluntly or sharply pointed. Dorsal margin straight, ventral margin straight, rarely curved. Umbos low, approximately even with the hinge line. Beak sculpture of four or five concentric ridges. Two shallow grooves present on the posterior slope, giving rise to a short ridge. Surface smooth and shiny in small shells, becoming rougher and dull in older individuals. Periostracum greenish or yellowish brown in young individuals, adults dark brown to black and rayless. Length to 5 inches (12.7 cm).
Pseudocardinal teeth small and thin; two in the left valve, one in the right. Lateral teeth relatively thin, short, and straight to slightly curved. Beak cavity shallow. Nacre white, occasionally with a tinge of salmon.
Hosts: Golden shiner (Watters 1995).
Habitat: Ponds, small creeks, and the headwaters of larger streams in mud or sand. (This mussel can withstand periods of desiccation and is often present in areas where few other mussels are found.)
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