Illinois Natural History Survey - University of Illinois

Lampsilis siliquoidea (Barnes, 1823)

Fatmucket


 

Lampsilis siliquoidea, INHS 3259
Lampsilis siliquoidea, INHS 3259. Sangamon River, Piatt County, Illinois. 
Length: 3.6 inches (9.1 cm) for male (top), 3.4 inches (8.6 cm) for female (bottom).

Other common names Grass mucket, black mucket, pugnose mucket.

Key charactersElongate, moderately large, and thick shell, yellow or tan with green rays; males bluntly pointed and compressed, females truncated and inflated.Lampsilis siliquoidea distribution

Similar species Yellow sandshellmucketplain pocketbookrainbowellipsepondmussel.

Description Shell elongate or elliptical, thin to thick, and compressed (young individuals) to inflated. Anterior end rounded, posterior end bluntly pointed (males) or truncated (females). Dorsal and ventral margins usually straight. Umbos only slightly elevated above the hinge line. Beak sculpture of six to ten double-looped bars. Shell smooth, yellow or yellowish green, sometimes tan or brown, with green rays of various widths that may become indistinct in older individuals. Length to 5 inches (12.7 cm).

Pseudocardinal teeth divergent, elongated, or triangular, thin to moderately thick; two in the left valve, one in the right (occasionally with a thin, ridgelike tooth in front). Lateral teeth straight to slightly curved, moderately long, and thin. Beak cavity moderately deep. Nacre white or bluish white and iridescent posteriorly.

Habitat Lakes and small to medium-sized streams in mud, sand, or gravel.

Status Widespread and common throughout the Midwest.


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