Pleurobema marshalli (Flat Pigtoe) is a species of mussels in the family unionid freshwater mussels. They are listed as critically endangered by IUCN. They are associated with freshwater habitat.
Definition: A taxon is Critically Endangered when the best available evidence indicates that it meets \r\nany of the criteria A to E for Critically Endangered, and it is therefore considered to be facing an extremely high risk of extinction in the wild
Definition: A habitat that is in or on a body of water containing low concentrations of dissolved salts and other total dissolved solids (<0.5 grams dissolved salts per litre).
