Dog Whelk (Atlantic Dogwinkle)
Phylum: Mollusca, Class: Gastropoda, Subclass: Caenogastropoda, Order: Neogastropoda, Family: Muricidae, Genus: Nucella, Species: Nucella lapillus · Muricidae (Murex or Rock Snail family) · Gastropod (univalve sea snail); whole shell with spiral/oval shape
Species
Nucella lapillus
Shell Type
Gastropod (univalve sea snail); whole shell with spiral/oval shape
Family
Muricidae (Murex or Rock Snail family)
Size
Approximately 20–30 mm (0.8–1.2 inches) in height, which falls directly within the typical adult range of 20–40 mm for this species.
Color & Pattern
Warm orange-apricot to tan exterior with faint spiral grooving/ridges. The interior aperture exhibits a creamy white columellar region with warm orange-buff tones lining the inner lip.
Rarity
Very Common
Habitat
Intertidal zone on rocky shores, wave-exposed coasts, and tidal pools. Marine environment.
Geographic Range
North Atlantic coasts: European Atlantic waters (Norway down to Portugal) and the Northwestern Atlantic coast from Canada (Labrador) south to New York.
Description
A classic, robust intertidal gastropod shell featuring a stout, oval shape with a relatively low spired structure. The body whorl is rounded and prominent, displaying fine spiral ridges across its exterior. The aperture is large, oval, and smooth on the inner columella, tapering slightly at the short siphonal canal.
Key Features
Thick heavy shell built to withstand strong wave action; short siphonal canal notch; prominent smooth white columellar fold/puckering; distinct spiral ridge texture on the body whorl.
Collector Value
Low commercial value ($1–$5) due to its abundance, but highly appreciated by regional shell collectors and educators for demonstrating natural variation in color and form.
Condition Notes
Fair to Good. Shows natural beach wear with soft weathering on the exterior sculpture and mild erosion/staining inside the aperture. Outer lip appears slightly worn.
Interesting Facts
Dog whelks produce a hypobranchial gland secretion that was historically used to create a rich purple or red dye similar to ancient Tyrian purple. Their shell shape and thickness vary dramatically based on local wave exposure and predator presence (e.g., crabs).
Ecological Role
Important intertidal predatory snail that feeds primarily on barnacles and mussels by drilling through their shells using a specialized radula and acid secretion.
Similar Species
Littorina littorea (Common Periwinkle) - lacks a siphonal canal notch; Urosalpinx cinerea (Atlantic Oyster Drill) - usually more elongated with sharper longitudinal ribs.
Beach Finding Tips
Look along rocky intertidal coasts during low tide. They are frequently found clustered in rock crevices, barnacle beds, or among mussels where they feed.