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What Is a Periwinkle Snail?

Britt Archer
Britt Archer

The term "periwinkle" doesn't just refer to a color or a type of flower. It is also the name of a common snail native to the northeastern European and Russian coasts of the Atlantic Ocean. The periwinkle snail, or littorina littorea, is also found in North America, where it is considered an invasive species after its accidental introduction in the mid-1800s. Highly valued for their taste, periwinkle snails are eaten in places all over the world.

The periwinkle snail, also called the common winkle, is a type of marine snail. It prefers intertidal zones, areas that are above water at low tide and below water at high tide, but also takes up residence in estuaries and tide pools. The winkle snails commonly cling to rocks or structures to steady themselves and provide a measure of protection against predators.

Woman holding a book
Woman holding a book

Another benefit of the periwinkle snail's affinity for rocks is that it affords the gastropods an abundant food source. Although the snails are technically omnivorous, the bulk of their diet comes from algae. Periwinkle snails also eat smaller invertebrates such as barnacle larvae.

The common winkle shell is an irregular oval shape with a sharply pointed edge that sometimes wears down due to erosion. The shells are thick and hefty with multiple bands of colors ranging from gray to brown with an interior color of dark brown. At maturity, the snails measure between 0.39 to 0.47 inches (9.9 to 11.93 millimeters) long, and between 1.18 to 2 inches (29.97 to 50.8 millimeters) tall.

A single periwinkle snail can live between five and ten years. Each year, a single female can lay 10,000 to 100,000 eggs, which hatch into larvae four to seven weeks later. Not all of the larvae make it to adulthood, with many thousands falling victim to predators and harsh sea conditions. Still, enough survive to make the periwinkle snail a common sight on Atlantic beaches.

Humans have long enjoyed a comfortable relationship with the periwinkle snail. Shells from the creatures have been found in Scottish shell piles dating back to at least 7,500 BCE. They're common in British and Irish cuisine, and they are sold by the bag. African and Asian cooks regard the snails as a delicacy. Common winkle parts are sometimes used as bait for catching fish.

Not everybody welcomes the periwinkle snail as a beneficial creature. Periwinkles in America are invasive. They take up resources used by native species, harming those species and altering the natural environment and ecology. As a result of accidental introduction, the periwinkle is found on both the Pacific and Atlantic coasts of North America and is considered one of the predominant species after wiping out several native species.

Frequently Asked Questions

What is a periwinkle snail and where can it be found?

Periwinkle snails are small, hardy marine gastropods belonging to the family Littorinidae. They are commonly found in intertidal zones along rocky shores, mangroves, and estuaries. These snails are widespread, with various species inhabiting different coastal regions around the world, from temperate to tropical environments.

What do periwinkle snails eat?

Periwinkle snails are primarily herbivorous, feeding on algae and biofilm that they scrape off rocks and other surfaces with their radula, a tongue-like organ with tiny teeth. Some species may also consume detritus, contributing to the ecosystem as cleaners by recycling organic matter.

How do periwinkle snails reproduce?

Periwinkle snails are known for their oviparous reproduction, meaning they lay eggs. After mating, females deposit egg capsules on hard surfaces, which later hatch into free-swimming larvae. These larvae go through a planktonic stage before settling onto a substrate and metamorphosing into juvenile snails.

Are periwinkle snails important to their ecosystem?

Yes, periwinkle snails play a crucial role in their ecosystems. They help control algal growth, contribute to nutrient cycling, and serve as prey for various predators, including birds, fish, and crabs. Their presence indicates a healthy intertidal zone, which is vital for biodiversity and coastal stability.

How long do periwinkle snails live?

The lifespan of periwinkle snails varies by species, but many can live for several years. In favorable conditions, some periwinkle snails can live up to 5 to 10 years, demonstrating their resilience and adaptability to changing tides and environmental conditions.

Are periwinkle snails affected by environmental changes?

Periwinkle snails are sensitive to environmental changes such as pollution, habitat destruction, and climate change. These factors can impact their survival and reproductive success. Conservation efforts are important to maintain healthy populations and ensure the stability of the ecosystems they inhabit.

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