P. generosa binomial = Panopea generosa binomial_authority = (Gould, 1850)

The geoduck (pron-en??u?.i?d?k "gooey duck"), Panopea generosa, is a species of very large saltwater (Seawater) clam, a marine (Marine (ocean)) bivalve mollusk in the family Hiatellidae.

The shell of this clam is large and contains small wings, about convert15cmin to over convert20cmin in length, but the very long siphons (siphon (mollusc)) make the clam itself very much longer than this: the "neck" or siphons alone can be convert1mft in length.