Wikipedia
Saxidomus
Saxidomus, common name the "Washington clams", is a genus of large edible saltwater clams, marine bivalve mollusks in the family Veneridae, the Venus clams.
The species Saxidomus gigantea is known as the "butter clam".
The word saxitoxin (the neurotoxin found in paralytic shellfish poisoning) is derived from the genus name Saxidomus.