Hard clam
species of mollusc
The hard clam (Mercenaria mercenaria), also known as the round clam, hard-shell (or hard-shelled) clam, or the quahog, is an edible marine bivalve mollusk that is native to the eastern shores of North America and Central America from Prince Edward Island to the Yucatán Peninsula. It is one of many unrelated edible bivalves that in the United States are frequently referred to simply as clams. Older literature sources may use the systematic name Venus mercenaria; this species is in the family Veneridae, the venus clams.
The "ocean quahog" is a different species, Arctica islandica, which, although superficially similar in shape, is in a different family of bivalves: it is rounder than the hard clam, usually has a black periostracum, and there is no pallial sinus in the interior of the shell.
Alternative names
The hard clam has many alternative common names, including the Northern quahog, round clam, and chowder clam.
Fish markets use specialist names for different sizes of this species of clam. The smallest legally harvestable clams are called countnecks or peanuts, the next size up are littlenecks, then come topnecks. Above these are the cherrystones, and the largest are called quahogs or chowder clams.
The distinctive name quahog ( KOH-hog, KWAW-hog, or kwə-HOG, also spelt quahaug, quohog
or cohog).
comes from the Narragansett word poquauhock (similar terms occur in Wampanoag and in some other Algonquian languages); it is attested (as 'quauhogs') in English-language usage from 1781.
“Hard clam” enters the record as species of mollusc. Crown Archives preserves that source wording while asking what Hard, clam and species can confirm, complicate or overturn.
Why this record matters
“Hard clam” is worth following because a concise public description often conceals a longer documentary argument. Here, Hard, clam and species provides the most credible route into that argument.
Stable identifiers, scientific names and standards terminology offer the best bridge between this overview and specialist evidence. The source revision retrieved here is dated Jun 10, 2026. The linked authority identifier is Q2279087. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1781.
A general summary may omit uncertainty, sample limits or methodological disagreement that is explicit in the technical record. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Check terminology, classification and the date of the cited evidence. Scientific names and technical consensus can change while older records retain historical value.
- Current terminology
- Classification context
- Finding cited technical literature
Primary datasets, specimen catalogues, standards bodies and the most recent peer-reviewed literature.
Three-step research path
- Establish the record: confirm the title “Hard clam”, its source revision and the description used here.
- Expand the search: follow Hard clam primary sources, Hard clam archive and Hard research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Hard clam”?
- Which observation, specimen, dataset or publication supports the account?
- Has classification or technical consensus changed since the cited source?
Search terms from this dossier
This entry incorporates text from “Hard clam” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.