Dog Whelk or Atlantic Dogwinkle
Phylum: Mollusca, Class: Gastropoda, Order: Neogastropoda, Family: Muricidae, Genus: Nucella, Species: N. lapillus · Muricidae (Murex and Dogwinkle family) · Gastropod (univalve snail), whole shell with spiral shape
Species
Nucella lapillus
Shell Type
Gastropod (univalve snail), whole shell with spiral shape
Family
Muricidae (Murex and Dogwinkle family)
Size
Approximately 1 to 1.5 inches, which is average for this species. Adults typically range from 0.75 to 2 inches in length.
Color & Pattern
Off-white to cream base color with distinct brown spiral banding along the whorls. Colors are natural but show minor signs of weathering. The interior of the aperture is partially obscured but typically matches the outer tones.
Rarity
Common
Habitat
Found in rocky intertidal zones, clinging to rocks, tide pools, and piers where they can withstand heavy wave action.
Geographic Range
North Atlantic coasts, spanning from northern Europe down to the Iberian Peninsula, and along the North American Atlantic coast from Labrador to New York.
Description
A sturdy, compact gastropod shell featuring a relatively short spire, a well-defined body whorl, and a robust structure designed to withstand crashing waves. The surface exhibits prominent spiral cords and axial growth lines, ending in a moderate-sized oval aperture.
Key Features
Stout, thick-walled shell with a relatively short spire, distinct spiral ribs, and a toothless or weakly toothed outer lip in mature adults.
Collector Value
Low to moderate value. While common and inexpensive, they are popular among regional shell collectors and educational displays due to their interesting ecology.
Condition Notes
Good condition overall. The shell is structurally intact with minor surface wear typical of intertidal environments, but retains its primary shape and banding patterns. Collectibility grade is Good.
Interesting Facts
Dog winkles are predatory marine snails that bore holes into the shells of barnacles and mussels to feed. Historically, members of the Muricidae family were used to produce valuable purple dye known as Tyrian purple.
Ecological Role
Acts as an important carnivorous predator in the rocky intertidal zone, helping to control populations of barnacles and mussels. They are preyed upon by crabs and shorebirds.
Similar Species
Thais haemastoma (Atlantic Rock Shell), which tends to be larger with more pronounced knobs and a distinctive orange-tinted aperture.
Beach Finding Tips
Look along rocky shores, jetties, and tide pools during low tide. Inspect crevices and the underside of boulders where they shelter from strong waves.