Howells Freshwater Mussels App

THREATENED AND ENDANGERED SPECIES• A species can be biologically or ecologically threatened orendangered without being legally listed by state or federalagencies as threatened or endangered.– When terms like “threatened” or “endangered” are used, they mayhave no legal significance at all.– Note that various groups define these terms differently.• At least one Texas mussel slipped into extinction withoutever being legally listed as either threatened or endangered;another probably has; & others are getting close.Rio Grande monkeyface (Quadrula couchiana) wasfound only in the Rio Grande. It was last seen nearBrackettville in 1898. It now occurs only in museumcollections or in fossil deposits.