Dog Whelk (also known as Atlantic Dogwinkle)
Phylum: Mollusca, Class: Gastropoda, Order: Neogastropoda, Family: Muricidae, Genus: Nucella, Species: N. lapillus · Muricidae (Murex and Rock Shell family) · Gastropod (univalve), whole shell, spiral shape with a short spire and large body whorl
Species
Nucella lapillus
Shell Type
Gastropod (univalve), whole shell, spiral shape with a short spire and large body whorl
Family
Muricidae (Murex and Rock Shell family)
Size
Approximately 1 inch in length, which is typical for an adult of this species, ranging generally between 0.75 and 1.5 inches.
Color & Pattern
Off-white or cream base color with faint, subtle brownish-yellow spiral banding visible on the body whorl. The colors appear slightly sun-bleached from exposure.
Rarity
Common
Habitat
Rocky intertidal zones, exposed coasts, and shores where they cling strongly to rocks, crevices, and tide pools to withstand heavy wave action.
Geographic Range
North Atlantic coasts, found extensively on both sides including northern Europe and the northeastern coast of North America down to New York.
Description
A sturdy, compact marine snail shell featuring a distinctive thick outer lip, a short pointed spire, and prominent spiral cords crossed by axial growth lines that create a rough, textured surface. The aperture is relatively narrow with a short siphonal canal.
Key Features
Compact thick-walled shell, prominent spiral ridges and cords, short spire, and a moderately sized oval aperture with a thickened outer lip in mature adults.
Collector Value
Low to moderate monetary value, common in shell collections and educational displays. Usually valued for locality variations rather than individual specimen cost.
Condition Notes
Good overall intact condition with minor wear on the apex and some sun-bleaching. The structure is solid with no major fractures. Collectibility grade is Good.
Interesting Facts
Nucella lapillus is a notorious predatory snail that bores holes into barnacles and mussels to feed. Historically, members of this family were used to produce royal purple dye.
Ecological Role
Acts as an important carnivorous predator in the rocky intertidal ecosystem, helping to regulate populations of barnacles and mussels.
Similar Species
Thais species and other small muricids, which can be distinguished by differences in geographical distribution, tooth structures inside the aperture, and finer sculptural details.
Beach Finding Tips
Search rocky shorelines and tide pools during extreme low tide. Look tightly wedged into rock crevices or attached to the undersides of boulders.