Robuta

https://www.fws.gov/media/gonidea-angulata-0 Gonidea angulata | FWS.gov gonidea angulatafws https://www.fws.gov/species/western-ridged-mussel-gonidea-angulata Western Ridged Mussel (Gonidea angulata) | U.S. Fish & Wildlife Service The western ridged mussel is the only species within the genus Gonidea. The range of its distribution has decreased, but it still occurs in California, Oregon,... western ridged musselgonidea angulatafishwildlifeservice