# West Atlantic Surfclam (*spisula solidissima*) The West Atlantic Surfclam, also known as the bar clam or hen clam, is a large, robust marine bivalve native to the western Atlantic Ocean. Thriving in the turbulent waters of the sandy surf zone, this impressive clam plays an essential role in its coastal ecosystem by filtering immense quantities of seawater and helping to stabilize shifting sands. It is one of the most commercially valuable clam species in North America, widely harvested for seafood dishes like clam chowders and fried clam strips. Despite heavy harvesting pressures, active management and sustainable fishing practices have helped maintain healthy populations of this resilient mollusk. - **Category:** [Invertebrate](https://www.snappit.app/explore/categories/invertebrate) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Snaps:** 1 - **Habitat:** Found in the shallow subtidal zone of sandy beaches and continental shelves, typically burrowed in clean sand from the low tide mark down to depths of about 60 meters. ![West Atlantic Surfclam](https://inaturalist-open-data.s3.amazonaws.com/photos/30325678/medium.jpg) Photo: Smithsonian Environmental Research Center, CC BY 4.0 · [iNaturalist](https://www.inaturalist.org/photos/30325678) ## Appearance The West Atlantic Surfclam features a large, heavy, and triangularly oval shell that typically reaches 10 to 22 centimeters in length. The shell's exterior is relatively smooth with fine, concentric growth lines and is covered in a thin, yellowish-brown outer skin that often wears away to reveal a chalky, off-white base. Inside, the shell is smooth and white, featuring a prominent, spoon-shaped hinge cavity where the internal ligament attaches, distinguishing it from other beach-dwelling bivalves. ## Taxonomy - **Kingdom:** Animalia - **Phylum:** Mollusca - **Class:** Bivalvia - **Order:** Venerida - **Family:** Mactridae - **Genus:** Spisula ## Interesting facts - A single female surfclam can release up to several self-produced millions of eggs into the water column during a single spawning event. - Much like counting the rings of a tree, scientists can determine the precise age of a surfclam by counting the annual growth lines on its cross-sectioned shell. - They are the primary species harvested for the commercial clam strip and clam chowder industries in the United States. ## Special abilities - **Rapid Sand Burrowing:** Uses a highly muscular, tongue-shaped foot to anchor itself and quickly pull its shell deep into loose, wet sand to escape heavy waves and predators. - **High-Efficiency Filtration:** Capable of processing gallons of seawater every hour, filtering out organic particles and plankton while purifying the local aquatic environment. - **Retractable Double Siphons:** Features long, muscular siphons that extend to the surface of the sand to draw in oxygenated water and food while keeping the body safely buried. ## Measurements & details - **Length:** 10-22 cm - **Weight:** 0.2-0.9 kg - **Lifespan:** 15-40 years - **Incubation:** 18-35 days ## Diet & Feeding As a suspension feeder, it sucks in seawater through its incurrent siphon, using its gills to trap microscopic organisms and organic particles. - **Age differences:** Planktonic larvae feed exclusively on tiny microalgae, while settled adults filter a wider variety of phytoplankton and organic particulate matter. - **Primary Foods:** Diatoms, Dinoflagellates, Microscopic algae, Suspended organic detritus - **Foraging Method:** Filtering ## Ecological connections - **Eaten by:** Atlantic Moon Snail (*Neverita duplicata*) — Prays upon the surfclam by drilling a neat, countersunk hole directly through its thick shell to consume the soft inner tissues. - **Eaten by:** Forbes Sea Star (*Asterias forbesi*) — Uses its powerful water vascular system and tube feet to pry open young surfclams on the ocean floor. - **Eaten by:** [Human](https://www.snappit.app/explore/human) (*Homo sapiens*) — Harvests adult surfclams on a massive commercial scale using hydraulic dredges for food products. ## Safety **Danger:** 1/5 · Very low No special safety notes yet. ## Frequently Asked Questions ### How to identify West Atlantic Surfclam? Compare the overall shape, opening, spiral, ribs, hinge and surface sculpture. Beach shells often lose the colors and sharp edges they had on the living animal, so shape does most of the work. Seashell Identifier: upload a photo and compare the visible details. ### How long is West Atlantic Surfclam? 10-22 cm ### How much does West Atlantic Surfclam weigh? 0.2-0.9 kg ### How long does West Atlantic Surfclam live? 15-40 years ### What does West Atlantic Surfclam eat? As a suspension feeder, it sucks in seawater through its incurrent siphon, using its gills to trap microscopic organisms and organic particles. ### Where is West Atlantic Surfclam usually found? Found in the shallow subtidal zone of sandy beaches and continental shelves, typically burrowed in clean sand from the low tide mark down to depths of about 60 meters. ### How does West Atlantic Surfclam hunt? Filtering ### How long do West Atlantic Surfclam eggs take to hatch? 18-35 days ## Where to spot - [Bellevue Avenue Historic District](https://www.snappit.app/guides/places/bellevue-avenue-historic-district) — Rhode Island, US · Historic District - [Greenwood Farm](https://www.snappit.app/guides/places/greenwood-farm) — Massachusetts, US · Historic Site - [Southampton Village Historic District](https://www.snappit.app/guides/places/southampton-village-historic-district) — New York, US · Historic District - [Stavros Reservation](https://www.snappit.app/guides/places/stavros-reservation) — Massachusetts, US · Nature Reserve - [Maria Mitchell Aquarium](https://www.snappit.app/guides/places/maria-mitchell-aquarium) — Massachusetts, US · Zoo [View all places to see West Atlantic Surfclam](https://www.snappit.app/guides/where-to-see/west-atlantic-surfclam) ## More Invertebrate - [Coral](https://www.snappit.app/explore/coral) - [Crab Spider](https://www.snappit.app/explore/crab-spider) (*Mecaphesa asperata*) - [Garden Spider](https://www.snappit.app/explore/garden-spider) (*Araneus diadematus*) - [Brown Recluse Spider](https://www.snappit.app/explore/brown-recluse-spider) (*Loxosceles reclusa*) --- Source: [West Atlantic Surfclam: Facts & Places to See — Snappit](https://www.snappit.app/explore/west-atlantic-surfclam)