A live specimen of Panopea generosa

Description
English: A geoduck (Panopea generosa) being held in two hands
Other information: This photograph was taken for a public institution in the state of Washington.
Date 8/1/2014
Source The Evergreen State College photo archives
Author The Evergreen State College
Source: https://commons.wikimedia.org/wiki/File:Geoduck_held_in_two_hands.jpg

The Pacific geoduck, scientific name Panopea generosa, is a species of very large, edible saltwater clam in the family Hiatellidae. The common name is derived from a Lushootseed (Nisqually) word gʷídəq. The geoduck is native to the west coast of North America. The shell of the clam ranges from 15 centimetres to over 20 centimetres in length, but the extremely long siphons make the clam itself much longer than this: the "neck" or siphons alone can be 1 metre in length. The geoduck is the largest burrowing clam in the world. It is also one of the longest-living animals of any type, with a lifespan of up to 140 years; the oldest has been recorded at 168 years old. Order: Myoida, Family: Hiatellidae, Genus: Panopea, Species: Panopea generosa Gould, 1850.