Invertebrates
Quahog
Mercenaria mercenaria · also called hard clam
Buried in the sandy bottom of a quiet Atlantic bay, a single quahog may have been filtering the same waters since long before anyone alive today was born, its thick shell having outlasted generations of the very people who might dig nearby for clams.
Overview
The quahog, Mercenaria mercenaria, is a long-lived bivalve native to shallow coastal waters along the Atlantic coast of North America. Its extraordinary lifespan, potentially spanning centuries, and its historical role as the source of wampum make it one of the more culturally and biologically remarkable shellfish species in North America.
A shell that has seen centuries pass
Few animals of any kind live as long as the quahog manages to, quietly filtering the same stretch of coastal water for generation after generation while barely changing in appearance from one century to the next.
Status
Least Concern — widespread and abundant across suitable coastal habitat along the Atlantic coast of North America.
Quahog: common questions
How long can a quahog live?
A quahog can live for an extraordinarily long time, with some individuals documented living for centuries, ranking it among the longest-lived non-colonial animals known, a lifespan far beyond what most people would expect from an ordinary-looking clam.
What is wampum, and how does it relate to the quahog?
Wampum refers to beads historically crafted by Indigenous peoples of the Atlantic coast from the purple and white portions of the quahog's shell, used as a form of currency and for ceremonial and diplomatic purposes, making the quahog culturally and historically significant well beyond its role as a food source.
Why is the quahog also called the hard clam?
The quahog has a notably hard, thick shell compared with many other bivalve species, a feature that gave the animal its alternate common name, the hard clam, and one that likely contributes to its remarkably long lifespan by offering strong, durable protection throughout its many decades or even centuries of life.
Where does the quahog live?
The quahog is native to shallow coastal waters along the Atlantic coast of North America, burrowing into sandy or muddy substrate where it remains largely stationary once settled, filtering plankton and organic particles from the surrounding water.