Genus Strophitus
Class Bivalvia
: Subclass Paleoheterodonta
: Genus Strophitus
Strophitus undulatus (Squawfoot)
The squawfoot mussel shell thickens as it grows (up to four inches in length). Its shape is elliptical with bluntly rounded ends. The surface is a smooth and shiny dark brown in adults. This species lives in the mud, sand, or gravel of small to medium-sized streams (and sometimes large rivers). It has occurred in all of Illinois.
Conservation status: common and widespread
Taxonomy: Order Unionoida; Superfamily Unionoidea; Family Unionidae; Subfamily Anodontinae
Collection of the Illinois State Museum, phhotograph by Karen Little
ISM Accession #: 678363
Class Bivalvia
: Subclass Paleoheterodonta
: Genus Strophitus
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